diff --git a/std/algorithm/comparison.d b/std/algorithm/comparison.d
index 5a671a7ad22..fe7b2992989 100644
--- a/std/algorithm/comparison.d
+++ b/std/algorithm/comparison.d
@@ -804,9 +804,10 @@ pure @safe unittest
     assert(result > 0);
 }
 
+// cmp for string with custom predicate fails if distinct chars can compare equal
+// https://issues.dlang.org/show_bug.cgi?id=18286
 @nogc nothrow pure @safe unittest
 {
-    // Issue 18286: cmp for string with custom predicate fails if distinct chars can compare equal
     static bool ltCi(dchar a, dchar b)// less than, case insensitive
     {
         import std.ascii : toUpper;
@@ -819,9 +820,10 @@ pure @safe unittest
     static assert(cmp!ltCi("apple", "APPLE") == 0);
 }
 
+// for non-string ranges check that opCmp is evaluated only once per pair.
+// https://issues.dlang.org/show_bug.cgi?id=18280
 @nogc nothrow @safe unittest
 {
-    // Issue 18280: for non-string ranges check that opCmp is evaluated only once per pair.
     static int ctr = 0;
     struct S
     {
diff --git a/std/algorithm/iteration.d b/std/algorithm/iteration.d
index 846a246b6b7..a82eff28378 100644
--- a/std/algorithm/iteration.d
+++ b/std/algorithm/iteration.d
@@ -207,7 +207,7 @@ if (isBidirectionalRange!Range)
     assert(counter == iota(-4, 5).length);
 }
 
-// issue 15891
+// https://issues.dlang.org/show_bug.cgi?id=15891
 @safe pure unittest
 {
     assert([1].map!(x=>[x].map!(y=>y)).cache.front.front == 1);
@@ -356,7 +356,7 @@ private struct _Cache(R, bool bidir)
         else
         {
             // needed, because the compiler cannot deduce, that 'caches' is initialized
-            // see issue 15891
+            // see https://issues.dlang.org/show_bug.cgi?id=15891
             caches[0] = UE.init;
             static if (bidir)
                 caches[1] = UE.init;
@@ -395,7 +395,7 @@ private struct _Cache(R, bool bidir)
             caches[0] = source.front;
         else
         {
-            // see issue 15891
+            // see https://issues.dlang.org/show_bug.cgi?id=15891
             caches[0] = UE.init;
             static if (bidir)
                 caches[1] = UE.init;
@@ -409,7 +409,7 @@ private struct _Cache(R, bool bidir)
             caches[1] = source.back;
         else
         {
-            // see issue 15891
+            // see https://issues.dlang.org/show_bug.cgi?id=15891
             caches[0] = UE.init;
             caches[1] = UE.init;
         }
@@ -502,7 +502,9 @@ if (fun.length >= 1)
             alias _funs = staticMap!(unaryFun, fun);
             alias _fun = adjoin!_funs;
 
-            // Once DMD issue #5710 is fixed, this validation loop can be moved into a template.
+            // Once https://issues.dlang.org/show_bug.cgi?id=5710 is fixed
+            // accross all compilers (as of 2020-04, it wasn't fixed in LDC and GDC),
+            // this validation loop can be moved into a template.
             foreach (f; _funs)
             {
                 static assert(!is(typeof(f(RE.init)) == void),
@@ -514,7 +516,8 @@ if (fun.length >= 1)
             alias _fun = unaryFun!fun;
             alias _funs = AliasSeq!(_fun);
 
-            // Do the validation separately for single parameters due to DMD issue #15777.
+            // Do the validation separately for single parameters due to
+            // https://issues.dlang.org/show_bug.cgi?id=15777.
             static assert(!is(typeof(_fun(RE.init)) == void),
                 "Mapping function(s) must not return void: " ~ _funs.stringof);
         }
@@ -565,10 +568,9 @@ it separately:
     assert(equal(stringize([ 1, 2, 3, 4 ]), [ "1", "2", "3", "4" ]));
 }
 
+// Verify workaround for https://issues.dlang.org/show_bug.cgi?id=15777
 @safe unittest
 {
-    // Verify workaround for DMD #15777
-
     import std.algorithm.mutation, std.string;
     auto foo(string[] args)
     {
@@ -805,7 +807,7 @@ private struct MapResult(alias fun, Range)
     assert(equal(ms2[0 .. 2], "日本"w));
     assert(equal(ms3[0 .. 2], "HE"));
 
-    // Issue 5753
+    // https://issues.dlang.org/show_bug.cgi?id=5753
     static void voidFun(int) {}
     static int nonvoidFun(int) { return 0; }
     static assert(!__traits(compiles, map!voidFun([1])));
@@ -814,7 +816,7 @@ private struct MapResult(alias fun, Range)
     static assert(!__traits(compiles, map!(voidFun, nonvoidFun)([1])));
     static assert(!__traits(compiles, map!(a => voidFun(a))([1])));
 
-    // Phobos issue #15480
+    // https://issues.dlang.org/show_bug.cgi?id=15480
     auto dd = map!(z => z * z, c => c * c * c)([ 1, 2, 3, 4 ]);
     assert(dd[0] == tuple(1, 1));
     assert(dd[1] == tuple(4, 8));
@@ -836,7 +838,7 @@ private struct MapResult(alias fun, Range)
 {
     import std.range : iota;
 
-    // Issue #10130 - map of iota with const step.
+    // https://issues.dlang.org/show_bug.cgi?id=10130 - map of iota with const step.
     const step = 2;
     assert(map!(i => i)(iota(0, 10, step)).walkLength == 5);
 
@@ -1142,7 +1144,8 @@ public:
     assert(b == [ 3, 4, 5 ]);
 }
 
-// #15358: application of `each` with >2 args (opApply)
+// https://issues.dlang.org/show_bug.cgi?id=15358
+// application of `each` with >2 args (opApply)
 @system unittest
 {
     import std.range : lockstep;
@@ -1157,7 +1160,8 @@ public:
     assert(c == [7,8,9]);
 }
 
-// #15358: application of `each` with >2 args (range interface)
+// https://issues.dlang.org/show_bug.cgi?id=15358
+// application of `each` with >2 args (range interface)
 @safe unittest
 {
     import std.range : zip;
@@ -1172,7 +1176,8 @@ public:
     assert(res == [9, 12, 15]);
 }
 
-// #16255: `each` on opApply doesn't support ref
+// https://issues.dlang.org/show_bug.cgi?id=16255
+// `each` on opApply doesn't support ref
 @safe unittest
 {
     int[] dynamicArray = [1, 2, 3, 4, 5];
@@ -1188,7 +1193,8 @@ public:
     assert(staticArray == [3, 4, 5, 6, 7]);
 }
 
-// #16255: `each` on opApply doesn't support ref
+// https://issues.dlang.org/show_bug.cgi?id=16255
+// `each` on opApply doesn't support ref
 @system unittest
 {
     struct S
@@ -1204,7 +1210,8 @@ public:
     assert(s.x == 2);
 }
 
-// #15357: `each` should behave similar to foreach
+// https://issues.dlang.org/show_bug.cgi?id=15357
+// `each` should behave similar to foreach
 /// `each` works with iterable objects which provide an index variable, along with each element
 @safe unittest
 {
@@ -1221,7 +1228,8 @@ public:
     assert(arr.sum == 4.iota.sum);
 }
 
-// #15357: `each` should behave similar to foreach
+// https://issues.dlang.org/show_bug.cgi?id=15357
+// `each` should behave similar to foreach
 @system unittest
 {
     import std.range : iota, lockstep;
@@ -1248,7 +1256,8 @@ public:
     assert(arrC.sum == 12);
 }
 
-// #15357: `each` should behave similar to foreach
+// https://issues.dlang.org/show_bug.cgi?id=15357
+// `each` should behave similar to foreach
 @system unittest
 {
     import std.range : lockstep;
@@ -1502,7 +1511,7 @@ private struct FilterResult(alias pred, Range)
     assert(equal(filter!underX(list), [ 1, 2, 3, 4 ]));
 }
 
-// issue 19823
+// https://issues.dlang.org/show_bug.cgi?id=19823
 @safe unittest
 {
     import std.algorithm.comparison : equal;
@@ -1793,7 +1802,7 @@ if (isInputRange!R)
     import std.algorithm.comparison : equal;
     import std.typecons : tuple;
 
-    // Issue 13857
+    // https://issues.dlang.org/show_bug.cgi?id=13857
     immutable(int)[] a1 = [1,1,2,2,2,3,4,4,5,6,6,7,8,9,9,9];
     auto g1 = group(a1);
     assert(equal(g1, [ tuple(1, 2u), tuple(2, 3u), tuple(3, 1u),
@@ -1801,12 +1810,12 @@ if (isInputRange!R)
                        tuple(7, 1u), tuple(8, 1u), tuple(9, 3u)
                      ]));
 
-    // Issue 13162
+    // https://issues.dlang.org/show_bug.cgi?id=13162
     immutable(ubyte)[] a2 = [1, 1, 1, 0, 0, 0];
     auto g2 = a2.group;
     assert(equal(g2, [ tuple(1, 3u), tuple(0, 3u) ]));
 
-    // Issue 10104
+    // https://issues.dlang.org/show_bug.cgi?id=10104
     const a3 = [1, 1, 2, 2];
     auto g3 = a3.group;
     assert(equal(g3, [ tuple(1, 2u), tuple(2, 2u) ]));
@@ -1849,7 +1858,8 @@ if (isInputRange!R)
     assert(t.equal([ tuple(3, 1u), tuple(4, 3u), tuple(5, 1u) ]));
 }
 
-pure @safe unittest // issue 18657
+// https://issues.dlang.org/show_bug.cgi?id=18657
+pure @safe unittest
 {
     import std.algorithm.comparison : equal;
     import std.range : refRange;
@@ -2402,7 +2412,9 @@ version (none) // this example requires support for non-equivalence relations
         assert(!range.empty);    // Opposite of refInputRange test
     }
 
-    /* Issue 93532 - General behavior of non-forward input ranges.
+    /* https://issues.dlang.org/show_bug.cgi?id=19532
+     * General behavior of non-forward input ranges.
+     *
      * - If the same chunk is retrieved multiple times via front, the separate chunk
      *   instances refer to a shared range segment that advances as a single range.
      * - Emptying a chunk via popFront does not implicitly popFront the chunk off
@@ -2517,7 +2529,7 @@ version (none) // this example requires support for non-equivalence relations
         }
     }
 
-    // Issue 93532 - Using roundRobin/chunkBy
+    // https://issues.dlang.org/show_bug.cgi?id=19532 - Using roundRobin/chunkBy
     {
         import std.algorithm.comparison : equal;
         import std.range : roundRobin;
@@ -2541,7 +2553,7 @@ version (none) // this example requires support for non-equivalence relations
         assert(r3.equal!equal(expected));
     }
 
-    // Issue 93532 - Using merge/chunkBy
+    // https://issues.dlang.org/show_bug.cgi?id=19532 - Using merge/chunkBy
     {
         import std.algorithm.comparison : equal;
         import std.algorithm.sorting : merge;
@@ -2564,7 +2576,7 @@ version (none) // this example requires support for non-equivalence relations
         assert(r3.equal!equal(expected));
     }
 
-    // Issue 93532 - Using chunkBy/map-fold
+    // https://issues.dlang.org/show_bug.cgi?id=19532 - Using chunkBy/map-fold
     {
         import std.algorithm.comparison : equal;
         import std.algorithm.iteration : fold, map;
@@ -2588,7 +2600,10 @@ version (none) // this example requires support for non-equivalence relations
         assert(r3.equal(expected));
     }
 
-    // Issues 16169, 17966, 93532 - Using multiwayMerge/chunkBy
+    // https://issues.dlang.org/show_bug.cgi?id=16169
+    // https://issues.dlang.org/show_bug.cgi?id=17966
+    // https://issues.dlang.org/show_bug.cgi?id=19532
+    // Using multiwayMerge/chunkBy
     {
         import std.algorithm.comparison : equal;
         import std.algorithm.setops : multiwayMerge;
@@ -2628,7 +2643,7 @@ version (none) // this example requires support for non-equivalence relations
 
 }
 
-// Issue 13595
+// https://issues.dlang.org/show_bug.cgi?id=13595
 version (none) // This requires support for non-equivalence relations
 @system unittest
 {
@@ -2642,7 +2657,7 @@ version (none) // This requires support for non-equivalence relations
     ]));
 }
 
-// Issue 13805
+// https://issues.dlang.org/show_bug.cgi?id=13805
 @system unittest
 {
     [""].map!((s) => s).chunkBy!((x, y) => true);
@@ -2893,7 +2908,7 @@ if (isInputRange!RoR && isInputRange!(ElementType!RoR)
     import std.algorithm.comparison : equal;
     import std.range;
 
-    // Related to issue 8061
+    // Related to https://issues.dlang.org/show_bug.cgi?id=8061
     auto r = joiner([
         inputRangeObject("abc"),
         inputRangeObject("def"),
@@ -2930,7 +2945,7 @@ if (isInputRange!RoR && isInputRange!(ElementType!RoR)
 
     assert(equal(u, "+-abc+-+-def+-"));
 
-    // Issue 13441: only(x) as separator
+    // https://issues.dlang.org/show_bug.cgi?id=13441: only(x) as separator
     string[][] lines = [null];
     lines
         .joiner(only("b"))
@@ -3290,11 +3305,11 @@ if (isInputRange!RoR && isInputRange!(ElementType!RoR))
     import std.range.interfaces : inputRangeObject;
     import std.range : retro;
 
-    // bugzilla 8240
+    // https://issues.dlang.org/show_bug.cgi?id=8240
     assert(equal(joiner([inputRangeObject("")]), ""));
     assert(equal(joiner([inputRangeObject("")]).retro, ""));
 
-    // issue 8792
+    // https://issues.dlang.org/show_bug.cgi?id=8792
     auto b = [[1], [2], [3]];
     auto jb = joiner(b);
     auto js = jb.save;
@@ -3515,7 +3530,7 @@ if (isInputRange!RoR && isInputRange!(ElementType!RoR))
         to!string("Unexpected result: '%s'"d.algoFormat(result)));
 }
 
-// Issue 8061
+// https://issues.dlang.org/show_bug.cgi?id=8061
 @system unittest
 {
     import std.conv : to;
@@ -3592,7 +3607,7 @@ if (isInputRange!RoR && isInputRange!(ElementType!RoR))
     }
 }
 
-// Issue 19850
+// https://issues.dlang.org/show_bug.cgi?id=19850
 @safe pure unittest
 {
     assert([[0]].joiner.save.back == 0);
@@ -3732,7 +3747,7 @@ if (fun.length >= 1)
         alias E = Select!(isInputRange!R, ElementType!R, ForeachType!R);
 
         static if (mustInitialize) bool initialized = false;
-        foreach (/+auto ref+/ E e; r) // @@@4707@@@
+        foreach (/+auto ref+/ E e; r) // https://issues.dlang.org/show_bug.cgi?id=4707
         {
             foreach (i, f; binfuns)
             {
@@ -3941,7 +3956,8 @@ The number of seeds must be correspondingly increased.
 
 @safe unittest
 {
-    // Issue #10408 - Two-function reduce of a const array.
+    // https://issues.dlang.org/show_bug.cgi?id= 10408
+    // Two-function reduce of a const array.
     import std.algorithm.comparison : max, min;
     import std.typecons : tuple, Tuple;
 
@@ -3954,7 +3970,7 @@ The number of seeds must be correspondingly increased.
 
 @safe unittest
 {
-    //10709
+    // https://issues.dlang.org/show_bug.cgi?id=10709
     import std.typecons : tuple, Tuple;
 
     enum foo = "a + 0.5 * b";
@@ -4021,7 +4037,8 @@ The number of seeds must be correspondingly increased.
     assert(minmaxElement([1, 2, 3]) == tuple(1, 3));
 }
 
-@safe unittest //12569
+// https://issues.dlang.org/show_bug.cgi?id=12569
+@safe unittest
 {
     import std.algorithm.comparison : max, min;
     import std.typecons : tuple;
@@ -4042,7 +4059,8 @@ The number of seeds must be correspondingly increased.
     static assert(!is(typeof(reduce!(all, all)(tuple(1, 1), "hello"))));
 }
 
-@safe unittest //13304
+// https://issues.dlang.org/show_bug.cgi?id=13304
+@safe unittest
 {
     int[] data;
     static assert(is(typeof(reduce!((a, b) => a + b)(data))));
@@ -4514,7 +4532,8 @@ The number of seeds must be correspondingly increased.
     assert(minmaxElement([1, 2, 3]).equal([tuple(1, 1), tuple(1, 2), tuple(1, 3)]));
 }
 
-@safe unittest //12569
+// https://issues.dlang.org/show_bug.cgi?id=12569
+@safe unittest
 {
     import std.algorithm.comparison : equal, max, min;
     import std.typecons : tuple;
@@ -4537,7 +4556,8 @@ The number of seeds must be correspondingly increased.
     static assert(!__traits(compiles, cumulativeFold!(all, all)("hello", tuple(1, 1))));
 }
 
-@safe unittest //13304
+// https://issues.dlang.org/show_bug.cgi?id=13304
+@safe unittest
 {
     int[] data;
     assert(data.cumulativeFold!((a, b) => a + b).empty);
@@ -4937,7 +4957,9 @@ if (is(typeof(binaryFun!pred(r.front, s)) : bool)
     assert(split.front == "b ");
     assert(split.back == "r ");
 
-    foreach (DummyType; AllDummyRanges) {  // Bug 4408
+    // https://issues.dlang.org/show_bug.cgi?id=4408
+    foreach (DummyType; AllDummyRanges)
+    {
         static if (isRandomAccessRange!DummyType)
         {
             static assert(isBidirectionalRange!DummyType);
@@ -4964,7 +4986,8 @@ if (is(typeof(binaryFun!pred(r.front, s)) : bool)
     assert(s.empty);
 }
 
-@safe unittest // issue 18470
+// https://issues.dlang.org/show_bug.cgi?id=18470
+@safe unittest
 {
     import std.algorithm.comparison : equal;
 
@@ -4972,7 +4995,8 @@ if (is(typeof(binaryFun!pred(r.front, s)) : bool)
     assert(w.splitter!((a, b) => a.front() == b)(1).equal([[[0]], [[2]]]));
 }
 
-@safe unittest // issue 18470
+// https://issues.dlang.org/show_bug.cgi?id=18470
+@safe unittest
 {
     import std.algorithm.comparison : equal;
     import std.ascii : toLower;
@@ -5138,11 +5162,11 @@ if (is(typeof(binaryFun!pred(r.front, s.front)) : bool)
     assert(equal(sp6, ["", ""][]));
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=10773
 @safe unittest
 {
     import std.algorithm.comparison : equal;
 
-    // Issue 10773
     auto s = splitter("abc", "");
     assert(s.equal(["a", "b", "c"]));
 }
@@ -5383,7 +5407,7 @@ private struct SplitterResult(alias isTerminator, Range)
     import std.algorithm.comparison : equal;
     import std.uni : isWhite;
 
-    //@@@6791@@@
+    // https://issues.dlang.org/show_bug.cgi?id=6791
     assert(equal(
         splitter("là dove terminava quella valle"),
         ["là", "dove", "terminava", "quella", "valle"]
@@ -5395,7 +5419,8 @@ private struct SplitterResult(alias isTerminator, Range)
     assert(equal(splitter!"a=='本'"("日本語"), ["日", "語"]));
 }
 
-pure @safe unittest // issue 18657
+// https://issues.dlang.org/show_bug.cgi?id=18657
+pure @safe unittest
 {
     import std.algorithm.comparison : equal;
     import std.range : refRange;
@@ -5621,9 +5646,9 @@ if (isSomeString!Range ||
     assert(dictionary["last".byCodeUnit]== 4);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=19238
 @safe pure unittest
 {
-    // issue 19238
     import std.utf : byCodeUnit;
     import std.algorithm.comparison : equal;
     auto range = "hello    world".byCodeUnit.splitter;
@@ -6334,7 +6359,7 @@ if (isInputRange!R && Substs.length >= 2 && !is(CommonType!(Substs) == void))
     }}
 }
 
-// issue 19207
+// https://issues.dlang.org/show_bug.cgi?id=19207
 @safe pure nothrow unittest
 {
     import std.algorithm.comparison : equal;
@@ -6634,7 +6659,8 @@ private auto sumKahan(Result, R)(Result result, R r)
     assert(sum(SList!double(1, 2, 3, 4)[]) == 10);
 }
 
-@safe pure nothrow unittest // 12434
+// https://issues.dlang.org/show_bug.cgi?id=12434
+@safe pure nothrow unittest
 {
     immutable a = [10, 20];
     auto s1 = sum(a);
@@ -6936,7 +6962,8 @@ private struct UniqResult(alias pred, Range)
     }
 }
 
-@safe unittest // https://issues.dlang.org/show_bug.cgi?id=17264
+// https://issues.dlang.org/show_bug.cgi?id=17264
+@safe unittest
 {
     import std.algorithm.comparison : equal;
 
diff --git a/std/algorithm/mutation.d b/std/algorithm/mutation.d
index 81e635257bd..b60cb172c05 100644
--- a/std/algorithm/mutation.d
+++ b/std/algorithm/mutation.d
@@ -337,7 +337,7 @@ if (isInputRange!InputRange && isForwardRange!ForwardRange)
         assert(equal(arr, [1, 2, 3, 4, 5, 6, 7]));
     }
 
-    // Bugzilla 16959
+    // https://issues.dlang.org/show_bug.cgi?id=16959
     auto arr = ['4', '5', '6', '7', '1', '2', '3'];
     auto p = bringToFront(arr[0 .. 4], arr[4 .. $]);
 
@@ -507,7 +507,8 @@ $(LINK2 http://en.cppreference.com/w/cpp/algorithm/copy_backward, STL's `copy_ba
         assert(a[4 .. 9] == [6, 7, 8, 9, 10]);
     }
 
-    {   // Test for bug 7898
+    // https://issues.dlang.org/show_bug.cgi?id=7898
+    {
         enum v =
         {
             import std.algorithm;
@@ -520,9 +521,9 @@ $(LINK2 http://en.cppreference.com/w/cpp/algorithm/copy_backward, STL's `copy_ba
     }
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=13650
 @safe unittest
 {
-    // Issue 13650
     import std.meta : AliasSeq;
     static foreach (Char; AliasSeq!(char, wchar, dchar))
     {{
@@ -534,7 +535,8 @@ $(LINK2 http://en.cppreference.com/w/cpp/algorithm/copy_backward, STL's `copy_ba
     }}
 }
 
-@safe unittest // issue 18804
+// https://issues.dlang.org/show_bug.cgi?id=18804
+@safe unittest
 {
     static struct NullSink
     {
@@ -607,7 +609,8 @@ if ((isInputRange!Range && is(typeof(range.front = value)) ||
     assert(a == [ 5, 5, 5, 5 ]);
 }
 
-// issue 16342, test fallback on mutable narrow strings
+// test fallback on mutable narrow strings
+// https://issues.dlang.org/show_bug.cgi?id=16342
 @safe unittest
 {
     char[] chars = ['a', 'b'];
@@ -670,7 +673,7 @@ if ((isInputRange!Range && is(typeof(range.front = value)) ||
     chars[1 .. 3].fill(':');
     assert(chars == "a::d");
 }
-// end issue 16342
+// end https://issues.dlang.org/show_bug.cgi?id=16342
 
 @safe unittest
 {
@@ -1136,7 +1139,7 @@ pure nothrow @safe @nogc unittest
         move(s21, s22);
         assert(s21 == s22);
     });
-    // Issue 5661 test(1)
+    // https://issues.dlang.org/show_bug.cgi?id=5661 test(1)
     static struct S3
     {
         static struct X { int n = 0; ~this(){n = 0;} }
@@ -1149,7 +1152,7 @@ pure nothrow @safe @nogc unittest
     assert(s31.x.n == 0);
     assert(s32.x.n == 1);
 
-    // Issue 5661 test(2)
+    // https://issues.dlang.org/show_bug.cgi?id=5661 test(2)
     static struct S4
     {
         static struct X { int n = 0; this(this){n = 0;} }
@@ -1162,7 +1165,7 @@ pure nothrow @safe @nogc unittest
     assert(s41.x.n == 0);
     assert(s42.x.n == 1);
 
-    // Issue 13990 test
+    // https://issues.dlang.org/show_bug.cgi?id=13990 test
     class S5;
 
     S5 s51;
@@ -1270,7 +1273,7 @@ private T moveImpl(T)(ref T source)
         assert(s21 == s22);
     });
 
-    // Issue 5661 test(1)
+    // https://issues.dlang.org/show_bug.cgi?id=5661 test(1)
     static struct S3
     {
         static struct X { int n = 0; ~this(){n = 0;} }
@@ -1283,7 +1286,7 @@ private T moveImpl(T)(ref T source)
     assert(s31.x.n == 0);
     assert(s32.x.n == 1);
 
-    // Issue 5661 test(2)
+    // https://issues.dlang.org/show_bug.cgi?id=5661 test(2)
     static struct S4
     {
         static struct X { int n = 0; this(this){n = 0;} }
@@ -1296,7 +1299,7 @@ private T moveImpl(T)(ref T source)
     assert(s41.x.n == 0);
     assert(s42.x.n == 1);
 
-    // Issue 13990 test
+    // https://issues.dlang.org/show_bug.cgi?id=13990 test
     class S5;
 
     S5 s51;
@@ -1320,14 +1323,16 @@ private T moveImpl(T)(ref T source)
     assert(a.n == 0);
 }
 
-@safe unittest//Issue 6217
+// https://issues.dlang.org/show_bug.cgi?id=6217
+@safe unittest
 {
     import std.algorithm.iteration : map;
     auto x = map!"a"([1,2,3]);
     x = move(x);
 }
 
-@safe unittest// Issue 8055
+// https://issues.dlang.org/show_bug.cgi?id=8055
+@safe unittest
 {
     static struct S
     {
@@ -1347,7 +1352,8 @@ private T moveImpl(T)(ref T source)
     assert(b.x == 0);
 }
 
-@system unittest// Issue 8057
+// https://issues.dlang.org/show_bug.cgi?id=8057
+@system unittest
 {
     int n = 10;
     struct S
@@ -1369,7 +1375,7 @@ private T moveImpl(T)(ref T source)
     auto b = foo(a);
     assert(b.x == 1);
 
-    // Regression 8171
+    // Regression https://issues.dlang.org/show_bug.cgi?id=8171
     static struct Array(T)
     {
         // nested struct has no member
@@ -1476,7 +1482,7 @@ pure nothrow @nogc @system unittest
     assert(val == 0);
 }
 
-// issue 18913
+// https://issues.dlang.org/show_bug.cgi?id=18913
 @safe unittest
 {
     static struct NoCopy
@@ -1998,7 +2004,7 @@ private auto removeImpl(SwapStrategy s, Range, Offset...)(Range range, Offset of
     import std.exception : assertThrown;
     import std.range;
 
-    // http://d.puremagic.com/issues/show_bug.cgi?id=10173
+    // https://issues.dlang.org/show_bug.cgi?id=10173
     int[] test = iota(0, 10).array();
     assertThrown(remove!(SwapStrategy.stable)(test, tuple(2, 4), tuple(1, 3)));
     assertThrown(remove!(SwapStrategy.unstable)(test, tuple(2, 4), tuple(1, 3)));
@@ -2021,7 +2027,7 @@ private auto removeImpl(SwapStrategy s, Range, Offset...)(Range range, Offset of
     a = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ];
     assert(remove!(SwapStrategy.unstable)(a, 0, tuple(9, 11)) ==
             [ 8, 1, 2, 3, 4, 5, 6, 7 ]);
-    // http://d.puremagic.com/issues/show_bug.cgi?id=5224
+    // https://issues.dlang.org/show_bug.cgi?id=5224
     a = [ 1, 2, 3, 4 ];
     assert(remove!(SwapStrategy.unstable)(a, 2) ==
            [ 1, 2, 4 ]);
@@ -2042,19 +2048,19 @@ private auto removeImpl(SwapStrategy s, Range, Offset...)(Range range, Offset of
             == [0, 9, 8, 7, 4, 5]);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=11576
 @safe unittest
 {
-    // Issue 11576
     auto arr = [1,2,3];
     arr = arr.remove!(SwapStrategy.unstable)(2);
     assert(arr == [1,2]);
 
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=12889
 @safe unittest
 {
     import std.range;
-    // Bug# 12889
     int[1][] arr = [[0], [1], [2], [3], [4], [5], [6]];
     auto orig = arr.dup;
     foreach (i; iota(arr.length))
@@ -2906,9 +2912,9 @@ if (isBlitAssignable!T && !is(typeof(lhs.proxySwap(rhs))))
     static assert(!__traits(compiles, swap(const1, const2)));
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=4789
 @safe unittest
 {
-    //Bug# 4789
     int[1] s = [1];
     swap(s, s);
 
@@ -2946,23 +2952,24 @@ if (isBlitAssignable!T && !is(typeof(lhs.proxySwap(rhs))))
     assert(s.i3 == 2);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=11853
 @safe unittest
 {
-    //11853
     import std.traits : isAssignable;
     alias T = Tuple!(int, double);
     static assert(isAssignable!T);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=12024
 @safe unittest
 {
-    // 12024
     import std.datetime;
     SysTime a, b;
     swap(a, b);
 }
 
-@system unittest // 9975
+// https://issues.dlang.org/show_bug.cgi?id=9975
+@system unittest
 {
     import std.exception : doesPointTo, mayPointTo;
     static struct S2
diff --git a/std/algorithm/searching.d b/std/algorithm/searching.d
index 87e121e4f6e..1c851b58537 100644
--- a/std/algorithm/searching.d
+++ b/std/algorithm/searching.d
@@ -569,7 +569,7 @@ if (isNarrowString!R1 && isNarrowString!R2)
             assert(commonPrefix(to!S("hello, world"), to!T("hello, ")) == to!S("hello, "));
             assert(commonPrefix(to!S("hello, world"), to!T("hello, world")) == to!S("hello, world"));
 
-            //Bug# 8890
+            // https://issues.dlang.org/show_bug.cgi?id=8890
             assert(commonPrefix(to!S("Пиво"), to!T("Пони"))== to!S("П"));
             assert(commonPrefix(to!S("Пони"), to!T("Пиво"))== to!S("П"));
             assert(commonPrefix(to!S("Пиво"), to!T("Пиво"))== to!S("Пиво"));
@@ -735,7 +735,7 @@ if (isInputRange!R && !isInfinite!R)
     assert(count("日本語") == 3);
 }
 
-// Issue 11253
+// https://issues.dlang.org/show_bug.cgi?id=11253
 @safe nothrow unittest
 {
     assert([1, 2, 3].count([2, 3]) == 1);
@@ -847,7 +847,8 @@ if (isForwardRange!R
         }
     }
 
-    //Because of @@@8804@@@: Avoids both "unreachable code" or "no return statement"
+    // Because of https://issues.dlang.org/show_bug.cgi?id=8804
+    // Avoids both "unreachable code" or "no return statement"
     static if (isInfinite!R) assert(false, R.stringof ~ " must not be an"
             ~ " infinite range");
     else return -1;
@@ -951,7 +952,8 @@ if (isInputRange!R &&
         }
     }
 
-    //Because of @@@8804@@@: Avoids both "unreachable code" or "no return statement"
+    // Because of https://issues.dlang.org/show_bug.cgi?id=8804
+    // Avoids both "unreachable code" or "no return statement"
     static if (isInfinite!R) assert(false, R.stringof ~ " must not be an"
             ~ " inifite range");
     else return -1;
@@ -1196,7 +1198,8 @@ if (isInputRange!R &&
     import std.meta : AliasSeq;
 
     static foreach (S; AliasSeq!(char[], wchar[], dchar[], string, wstring, dstring))
-    (){ // workaround slow optimizations for large functions @@@BUG@@@ 2396
+    (){ // workaround slow optimizations for large functions
+        // https://issues.dlang.org/show_bug.cgi?id=2396
         assert(!endsWith(to!S("abc"), 'a'));
         assert(endsWith(to!S("abc"), 'a', 'c') == 2);
         assert(!endsWith(to!S("abc"), 'x', 'n', 'b'));
@@ -1572,7 +1575,7 @@ if (isInputRange!InputRange &&
 
     // If the haystack is a SortedRange we can use binary search to find the needle.
     // Works only for the default find predicate and any SortedRange predicate.
-    // 8829 enhancement
+    // https://issues.dlang.org/show_bug.cgi?id=8829
     import std.range : SortedRange;
     static if (is(InputRange : SortedRange!TT, TT) && isDefaultPred)
     {
@@ -1658,7 +1661,7 @@ if (isInputRange!InputRange &&
     }
     else static if (isArray!R)
     {
-        //10403 optimization
+        // https://issues.dlang.org/show_bug.cgi?id=10403 optimization
         static if (isDefaultPred && isIntegral!EType && EType.sizeof == 1 && isIntegralNeedle)
         {
             import std.algorithm.comparison : max, min;
@@ -1810,9 +1813,9 @@ if (isInputRange!InputRange &&
     assertCTFEable!dg;
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=11603
 @safe unittest
 {
-    // Bugzilla 11603
     enum Foo : ubyte { A }
     assert([Foo.A].find(Foo.A).empty == false);
 
@@ -1978,7 +1981,7 @@ if (isForwardRange!R1 && isForwardRange!R2
         // Binary search can be used to find the first occurence
         // of the first element of the needle in haystack.
         // When it is found O(walklength(needle)) steps are performed.
-        // 8829 enhancement
+        // https://issues.dlang.org/show_bug.cgi?id=8829 enhancement
         import std.algorithm.comparison : mismatch;
         import std.range : SortedRange;
         static if (is(R1 == R2)
@@ -2099,7 +2102,8 @@ if (isForwardRange!R1 && isForwardRange!R2
     assert([C(1,0), C(2,0), C(3,1), C(4,0)].find!"a.x == b"(SList!int(2, 3)[]) == [C(2,0), C(3,1), C(4,0)]);
 }
 
-@safe unittest // issue 12470
+// https://issues.dlang.org/show_bug.cgi?id=12470
+@safe unittest
 {
     import std.array : replace;
     inout(char)[] sanitize(inout(char)[] p)
@@ -2167,7 +2171,7 @@ if (isForwardRange!R1 && isForwardRange!R2
     assert(find([ 1, 2, 1, 2, 3, 3 ], SList!int(2, 3)[]) == [ 2, 3, 3 ]);
 }
 
-//Bug# 8334
+// https://issues.dlang.org/show_bug.cgi?id=8334
 @safe unittest
 {
     import std.algorithm.iteration : filter;
@@ -2183,7 +2187,7 @@ if (isForwardRange!R1 && isForwardRange!R2
     assert(find(haystack, filter!"true"(needle)).empty);
 }
 
-// issue 11013
+// https://issues.dlang.org/show_bug.cgi?id=11013
 @safe unittest
 {
     assert(find!"a == a"("abc","abc") == "abc");
@@ -2665,7 +2669,7 @@ if (isForwardRange!(Range))
     ReferenceForwardRange!int rfr = new ReferenceForwardRange!int([1, 2, 3, 2, 2, 3]);
     assert(equal(findAdjacent(rfr), [2, 2, 3]));
 
-    // Issue 9350
+    // https://issues.dlang.org/show_bug.cgi?id=9350
     assert(!repeat(1).findAdjacent().empty);
 }
 
@@ -2718,7 +2722,8 @@ if (isInputRange!InputRange && isForwardRange!ForwardRange)
     assert(findAmong!("a == b")(b, [ 4, 6, 7 ][]).empty);
 }
 
-@system unittest // issue 19765
+// https://issues.dlang.org/show_bug.cgi?id=19765
+@system unittest
 {
     import std.range.interfaces : inputRangeObject;
     auto choices = inputRangeObject("b");
@@ -2781,7 +2786,8 @@ if (isForwardRange!R1 && isForwardRange!R2
     assert(findSkip(s, "def") && s.empty);
 }
 
-@safe unittest // issue 19020
+// https://issues.dlang.org/show_bug.cgi?id=19020
+@safe unittest
 {
     static struct WrapperRange
     {
@@ -3313,7 +3319,7 @@ if (isForwardRange!R1 && isForwardRange!R2)
     assert(split[1] == "one");
 }
 
-// issue 11013
+// https://issues.dlang.org/show_bug.cgi?id=11013
 @safe pure unittest
 {
     auto var = "abc";
@@ -4842,7 +4848,8 @@ if (isInputRange!R &&
     import std.range;
 
     static foreach (S; AliasSeq!(char[], wchar[], dchar[], string, wstring, dstring))
-    (){ // workaround slow optimizations for large functions @@@BUG@@@ 2396
+    (){ // workaround slow optimizations for large functions
+        // https://issues.dlang.org/show_bug.cgi?id=2396
         assert(!startsWith(to!S("abc"), 'c'));
         assert(startsWith(to!S("abc"), 'a', 'c') == 1);
         assert(!startsWith(to!S("abc"), 'x', 'n', 'b'));
@@ -5125,7 +5132,8 @@ if (isInputRange!Range)
     assert(equal(until!"a == 2"(a, No.openRight), [1, 2]));
 }
 
-@system unittest // bugzilla 13171
+// https://issues.dlang.org/show_bug.cgi?id=13171
+@system unittest
 {
     import std.algorithm.comparison : equal;
     import std.range;
@@ -5134,7 +5142,8 @@ if (isInputRange!Range)
     assert(a == [4]);
 }
 
-@safe unittest // Issue 10460
+// https://issues.dlang.org/show_bug.cgi?id=10460
+@safe unittest
 {
     import std.algorithm.comparison : equal;
     auto a = [1, 2, 3, 4];
@@ -5143,14 +5152,16 @@ if (isInputRange!Range)
     assert(equal(a, [0, 0, 3, 4]));
 }
 
-@safe unittest // Issue 13124
+// https://issues.dlang.org/show_bug.cgi?id=13124
+@safe unittest
 {
     import std.algorithm.comparison : among, equal;
     auto s = "hello how\nare you";
     assert(equal(s.until!(c => c.among!('\n', '\r')), "hello how"));
 }
 
-pure @safe unittest // issue 18657
+// https://issues.dlang.org/show_bug.cgi?id=18657
+pure @safe unittest
 {
     import std.algorithm.comparison : equal;
     import std.range : refRange;
diff --git a/std/algorithm/setops.d b/std/algorithm/setops.d
index d6c05b54077..e80791a182d 100644
--- a/std/algorithm/setops.d
+++ b/std/algorithm/setops.d
@@ -346,7 +346,7 @@ if (!allSatisfy!(isForwardRange, R1, R2) ||
     }
 }
 
-// Issue 13091
+// https://issues.dlang.org/show_bug.cgi?id=13091
 pure nothrow @safe @nogc unittest
 {
     int[1] a = [1];
@@ -421,9 +421,10 @@ if (ranges.length >= 2 &&
     return Result(ranges);
 }
 
+// cartesian product of empty ranges should be empty
+// https://issues.dlang.org/show_bug.cgi?id=10693
 @safe unittest
 {
-    // Issue 10693: cartesian product of empty ranges should be empty.
     int[] a, b, c, d, e;
     auto cprod = cartesianProduct(a,b,c,d,e);
     assert(cprod.empty);
@@ -445,9 +446,9 @@ if (ranges.length >= 2 &&
     assert(cprod.init.empty);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=13393
 @safe unittest
 {
-    // Issue 13393
     assert(!cartesianProduct([0],[0],[0]).save.empty);
 }
 
@@ -506,7 +507,7 @@ if (!allSatisfy!(isForwardRange, R1, R2, RR) ||
     assert(canFind(N4, tuple(10, 3, 1, 2)));
 }
 
-// Issue 9878
+// https://issues.dlang.org/show_bug.cgi?id=9878
 ///
 @safe unittest
 {
@@ -545,7 +546,7 @@ pure @safe nothrow @nogc unittest
     assert(D.front == front1);
 }
 
-// Issue 13935
+// https://issues.dlang.org/show_bug.cgi?id=13935
 @safe unittest
 {
     import std.algorithm.iteration : map;
@@ -1109,7 +1110,8 @@ SetDifference!(less, R1, R2) setDifference(alias less = "a < b", R1, R2)
     assert(setDifference(r, x).empty);
 }
 
-@safe unittest // Issue 10460
+// https://issues.dlang.org/show_bug.cgi?id=10460
+@safe unittest
 {
     import std.algorithm.comparison : equal;
 
@@ -1429,7 +1431,8 @@ setSymmetricDifference(alias less = "a < b", R1, R2)
     assert(equal(setSymmetricDifference(c, d), [1, 1, 2, 5, 6, 7, 9]));
 }
 
-@safe unittest // Issue 10460
+// https://issues.dlang.org/show_bug.cgi?id=10460
+@safe unittest
 {
     import std.algorithm.comparison : equal;
 
diff --git a/std/algorithm/sorting.d b/std/algorithm/sorting.d
index 9e88a2326e7..affe2aada0b 100644
--- a/std/algorithm/sorting.d
+++ b/std/algorithm/sorting.d
@@ -224,7 +224,7 @@ if (isForwardRange!(Range))
 {
     import std.conv : to;
 
-    // Issue 9457
+    // https://issues.dlang.org/show_bug.cgi?id=9457
     auto x = "abcd";
     assert(isSorted(x));
     auto y = "acbd";
@@ -1563,7 +1563,8 @@ private void multiSortImpl(Range, SwapStrategy ss, funs...)(Range r)
     assert(pts4.multiSort!("a > b").release.equal(iota(10).retro));
 }
 
-@safe unittest //issue 9160 (L-value only comparators)
+//https://issues.dlang.org/show_bug.cgi?id=9160 (L-value only comparators)
+@safe unittest
 {
     static struct A
     {
@@ -1587,7 +1588,9 @@ private void multiSortImpl(Range, SwapStrategy ss, funs...)(Range r)
     assert(points[1] == A(4, 1));
 }
 
-@safe unittest // issue 16179 (cannot access frame of function)
+// cannot access frame of function
+// https://issues.dlang.org/show_bug.cgi?id=16179
+@safe unittest
 {
     auto arr = [[1, 2], [2, 0], [1, 0], [1, 1]];
     int c = 3;
@@ -1599,7 +1602,8 @@ private void multiSortImpl(Range, SwapStrategy ss, funs...)(Range r)
     assert(arr == [[1, 0], [1, 1], [1, 2], [2, 0]]);
 }
 
-@safe unittest //Issue 16413 - @system comparison function
+// https://issues.dlang.org/show_bug.cgi?id=16413 - @system comparison function
+@safe unittest
 {
     bool lt(int a, int b) { return a < b; } static @system
     auto a = [2, 1];
@@ -2015,14 +2019,14 @@ if (((ss == SwapStrategy.unstable && (hasSwappableElements!Range ||
     assert(isSorted!("toUpper(a) < toUpper(b)")(b));
 
     {
-        // Issue 10317
+        // https://issues.dlang.org/show_bug.cgi?id=10317
         enum E_10317 { a, b }
         auto a_10317 = new E_10317[10];
         sort(a_10317);
     }
 
     {
-        // Issue 7767
+        // https://issues.dlang.org/show_bug.cgi?id=7767
         // Unstable sort should complete without an excessive number of predicate calls
         // This would suggest it's running in quadratic time
 
@@ -2137,7 +2141,7 @@ package(std) template HeapOps(alias less, Range)
 
     alias lessFun = binaryFun!less;
 
-    //template because of @@@12410@@@
+    //template because of https://issues.dlang.org/show_bug.cgi?id=12410
     void heapSort()(Range r)
     {
         // If true, there is nothing to do
@@ -2152,7 +2156,7 @@ package(std) template HeapOps(alias less, Range)
         }
     }
 
-    //template because of @@@12410@@@
+    //template because of https://issues.dlang.org/show_bug.cgi?id=12410
     void buildHeap()(Range r)
     {
         immutable n = r.length;
@@ -2177,7 +2181,7 @@ package(std) template HeapOps(alias less, Range)
 
     // Sifts down r[parent] (which is initially assumed to be messed up) so the
     // heap property is restored for r[parent .. end].
-    // template because of @@@12410@@@
+    // template because of https://issues.dlang.org/show_bug.cgi?id=12410
     void siftDown()(Range r, size_t parent, immutable size_t end)
     {
         for (;;)
@@ -2205,7 +2209,7 @@ package(std) template HeapOps(alias less, Range)
     // restored. So there are more swaps but fewer comparisons. Gains are made
     // when the final position is likely to end toward the bottom of the heap,
     // so not a lot of sifts back are performed.
-    //template because of @@@12410@@@
+    //template because of https://issues.dlang.org/show_bug.cgi?id=12410
     void percolate()(Range r, size_t parent, immutable size_t end)
     {
         immutable root = parent;
@@ -2873,8 +2877,9 @@ private template TimSortImpl(alias pred, R)
     assert(result == true, "invalid result");
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=4584
 @safe unittest
-{//bugzilla 4584
+{
     assert(isSorted!"a < b"(sort!("a < b", SwapStrategy.stable)(
        [83, 42, 85, 86, 87, 22, 89, 30, 91, 46, 93, 94, 95, 6,
          97, 14, 33, 10, 101, 102, 103, 26, 105, 106, 107, 6]
@@ -2894,9 +2899,9 @@ private template TimSortImpl(alias pred, R)
     assert(y == "aebcd"d);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=14223
 @safe unittest
 {
-    // Issue 14223
     import std.array, std.range;
     auto arr = chain(iota(0, 384), iota(0, 256), iota(0, 80), iota(0, 64), iota(0, 96)).array;
     sort!("a < b", SwapStrategy.stable)(arr);
@@ -3081,33 +3086,33 @@ if (isRandomAccessRange!R && hasLength!R && hasSwappableElements!R)
     assert(strings == [ "three", "two", "one" ]);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=4909
 @safe unittest
 {
-    // issue 4909
     import std.typecons : Tuple;
     Tuple!(char)[] chars;
     schwartzSort!"a[0]"(chars);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=5924
 @safe unittest
 {
-    // issue 5924
     import std.typecons : Tuple;
     Tuple!(char)[] chars;
     schwartzSort!((Tuple!(char) c){ return c[0]; })(chars);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=13965
 @safe unittest
 {
-    // issue 13965
     import std.typecons : Tuple;
     Tuple!(char)[] chars;
     schwartzSort!("a[0]", SwapStrategy.stable)(chars);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=13965
 @safe unittest
 {
-    // issue 13965
     import std.algorithm.iteration : map;
     import std.numeric : entropy;
 
@@ -3670,7 +3675,7 @@ done:
     }
 }
 
-// bug 12987
+// https://issues.dlang.org/show_bug.cgi?id=12987
 @safe unittest
 {
     int[] a = [ 25, 7, 9, 2, 0, 5, 21 ];
@@ -3720,7 +3725,7 @@ if (isRandomAccessRange!(Range1) && hasLength!Range1 &&
     assert(a == [0, 1, 2, 2, 3]);
 }
 
-// bug 15421
+// https://issues.dlang.org/show_bug.cgi?id=15421
 @system unittest
 {
     import std.algorithm.comparison : equal;
@@ -3764,7 +3769,7 @@ if (isRandomAccessRange!(Range1) && hasLength!Range1 &&
     }
 }
 
-// bug 15421
+// https://issues.dlang.org/show_bug.cgi?id=15421
 @system unittest
 {
     auto a = [ 9, 8, 0, 3, 5, 25, 43, 4, 2, 0, 7 ];
@@ -3783,7 +3788,7 @@ if (isRandomAccessRange!(Range1) && hasLength!Range1 &&
     assert(a == b);
 }
 
-// bug 12987
+// https://issues.dlang.org/show_bug.cgi?id=12987
 @system unittest
 {
     int[] a = [ 5, 7, 2, 6, 7 ];
@@ -3793,7 +3798,7 @@ if (isRandomAccessRange!(Range1) && hasLength!Range1 &&
     assert(t == [ 0, 1, 2, 2, 3 ]);
 }
 
-// bug 15420
+// https://issues.dlang.org/show_bug.cgi?id=15420
 @system unittest
 {
     int[] a = [ 5, 7, 2, 6, 7 ];
@@ -4386,7 +4391,7 @@ if (isBidirectionalRange!BidirectionalRange &&
     assert(a == [3,2,1]);
 }
 
-// Issue 13594
+// https://issues.dlang.org/show_bug.cgi?id=13594
 @safe unittest
 {
     int[3] a = [1,2,3];
@@ -4561,9 +4566,9 @@ if (isBidirectionalRange!BidirectionalRange &&
     assert(b == [ 1, 3, 2 ]);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=13594
 @safe unittest
 {
-    // Issue 13594
     int[3] a = [1,2,3];
     assert(nextEvenPermutation(a[]));
     assert(a == [2,3,1]);
diff --git a/std/array.d b/std/array.d
index 651e3c8d0a0..c8818bd349c 100644
--- a/std/array.d
+++ b/std/array.d
@@ -207,9 +207,9 @@ if (isPointer!Range && isIterable!(PointerTarget!Range) && !isNarrowString!Range
     assert(equal(a, [Foo(1), Foo(2), Foo(3), Foo(4), Foo(5)]));
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=12315
 @safe unittest
 {
-    // Issue 12315
     static struct Bug12315 { immutable int i; }
     enum bug12315 = [Bug12315(123456789)].array();
     static assert(bug12315[0].i == 123456789);
@@ -226,9 +226,9 @@ if (isPointer!Range && isIterable!(PointerTarget!Range) && !isNarrowString!Range
 version (StdUnittest)
     private extern(C) void _d_delarray_t(void[] *p, TypeInfo_Struct ti);
 
+// https://issues.dlang.org/show_bug.cgi?id=18995
 @system unittest
 {
-    // Issue 18995
     int nAlive = 0;
     struct S
     {
@@ -343,7 +343,7 @@ if (isNarrowString!String)
     assert(array("ABC".dup) == "ABC"d.dup);
 }
 
-//Bug# 8233
+// https://issues.dlang.org/show_bug.cgi?id=8233
 @safe unittest
 {
     assert(array("hello world"d) == "hello world"d);
@@ -371,9 +371,9 @@ if (isNarrowString!String)
     }}
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=9824
 @safe unittest
 {
-    //9824
     static struct S
     {
         @disable void opAssign(S);
@@ -383,7 +383,7 @@ if (isNarrowString!String)
     arr.array();
 }
 
-// Bugzilla 10220
+// https://issues.dlang.org/show_bug.cgi?id=10220
 @safe unittest
 {
     import std.algorithm.comparison : equal;
@@ -554,7 +554,8 @@ if (isInputRange!Values && isInputRange!Keys)
     assert(c == expected);
 }
 
-// @@@11053@@@ - Cannot be version (StdUnittest) - recursive instantiation error
+// Cannot be version (StdUnittest) - recursive instantiation error
+// https://issues.dlang.org/show_bug.cgi?id=11053
 @safe unittest
 {
     import std.typecons;
@@ -564,7 +565,7 @@ if (isInputRange!Values && isInputRange!Keys)
     assert([ tuple("foo", "bar") ].assocArray() == ["foo": "bar"]);
 }
 
-// Issue 13909
+// https://issues.dlang.org/show_bug.cgi?id=13909
 @safe unittest
 {
     import std.typecons;
@@ -726,7 +727,7 @@ if (isAssociativeArray!AA)
     assert(savedPairs.front == tuple("a", 2));
 }
 
-// Issue 17711
+// https://issues.dlang.org/show_bug.cgi?id=17711
 @safe unittest
 {
     const(int[string]) aa = [ "abc": 123 ];
@@ -988,7 +989,8 @@ private auto arrayAllocImpl(bool minimallyInitialized, T, I...)(I sizes) nothrow
     assert(s2.length == 0);
 }
 
-@safe nothrow pure unittest //@@@9803@@@
+// https://issues.dlang.org/show_bug.cgi?id=9803
+@safe nothrow pure unittest
 {
     auto a = minimallyInitializedArray!(int*[])(1);
     assert(a[0] == null);
@@ -998,7 +1000,8 @@ private auto arrayAllocImpl(bool minimallyInitialized, T, I...)(I sizes) nothrow
     assert(c[0][0] == null);
 }
 
-@safe unittest //@@@10637@@@
+// https://issues.dlang.org/show_bug.cgi?id=10637
+@safe unittest
 {
     static struct S
     {
@@ -1141,7 +1144,8 @@ if (is(typeof(a.ptr < b.ptr) == bool))
     assert(overlap(c, d.idup).empty);
 }
 
-@safe pure nothrow unittest // bugzilla 9836
+ // https://issues.dlang.org/show_bug.cgi?id=9836
+@safe pure nothrow unittest
 {
     // range primitives for array should work with alias this types
     struct Wrapper
@@ -1523,7 +1527,8 @@ private template isInputRangeOrConvertible(E)
     });
 }
 
-@system unittest // bugzilla 6874
+// https://issues.dlang.org/show_bug.cgi?id=6874
+@system unittest
 {
     import core.memory;
     // allocate some space
@@ -2003,7 +2008,8 @@ if (isInputRange!RoR &&
     }
 }
 
-@safe unittest // Issue 14230
+// https://issues.dlang.org/show_bug.cgi?id=14230
+@safe unittest
 {
    string[] ary = ["","aa","bb","cc"]; // leaded by _empty_ element
    assert(ary.join(" @") == " @aa @bb @cc"); // OK in 2.067b1 and olders
@@ -2077,7 +2083,8 @@ if (isInputRange!RoR &&
     }
 }
 
-@safe unittest // Issue 10895
+// https://issues.dlang.org/show_bug.cgi?id=10895
+@safe unittest
 {
     class A
     {
@@ -2092,7 +2099,8 @@ if (isInputRange!RoR &&
     assert(temp.length == 3);
 }
 
-@safe unittest // Issue 14230
+// https://issues.dlang.org/show_bug.cgi?id=14230
+@safe unittest
 {
    string[] ary = ["","aa","bb","cc"];
    assert(ary.join('@') == "@aa@bb@cc");
@@ -2321,7 +2329,7 @@ if (isInputRange!RoR &&
     assert(join(f([f([1, 2]), f([41, 42])]), f([5, 6])) == [1, 2, 5, 6, 41, 42]);
 }
 
-// Issue 10683
+// https://issues.dlang.org/show_bug.cgi?id=10683
 @safe unittest
 {
     import std.range : join;
@@ -2330,7 +2338,7 @@ if (isInputRange!RoR &&
     assert([[tuple("x")]].join == [tuple("x")]);
 }
 
-// Issue 13877
+// https://issues.dlang.org/show_bug.cgi?id=13877
 @safe unittest
 {
     // Test that the range is iterated only once.
@@ -2723,7 +2731,7 @@ if (isInputRange!Range &&
     assert(replace(d, 5, 10, "⁴³²¹⁰"d) == "⁰¹²³⁴⁴³²¹⁰"d);
 }
 
-// Issue 18166
+// https://issues.dlang.org/show_bug.cgi?id=18166
 @safe pure unittest
 {
     auto str = replace("aaaaa"d, 1, 4, "***"d);
@@ -2793,9 +2801,9 @@ if (is(typeof(replace(array, from, to, stuff))))
     assert(a == [1, 4, 5, 5]);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=12889
 @safe unittest
 {
-    // Bug# 12889
     int[1][] arr = [[0], [1], [2], [3], [4], [5], [6]];
     int[1][] stuff = [[0], [1]];
     replaceInPlace(arr, 4, 6, stuff);
@@ -2804,7 +2812,7 @@ if (is(typeof(replace(array, from, to, stuff))))
 
 @system unittest
 {
-    // Bug# 14925
+    // https://issues.dlang.org/show_bug.cgi?id=14925
     char[] a = "mon texte 1".dup;
     char[] b = "abc".dup;
     replaceInPlace(a, 4, 9, b);
@@ -3030,7 +3038,7 @@ if (isDynamicArray!(E[]) &&
     }
 }
 
-//Bug# 8187
+// https://issues.dlang.org/show_bug.cgi?id=8187
 @safe unittest
 {
     auto res = ["a", "a"];
@@ -3636,7 +3644,8 @@ if (isDynamicArray!A)
     assert(app3[] == "Appender!(int[])(0001, 0002, 0003)");
 }
 
-@safe unittest // issue 17251
+// https://issues.dlang.org/show_bug.cgi?id=17251
+@safe unittest
 {
     static struct R
     {
@@ -3651,7 +3660,8 @@ if (isDynamicArray!A)
     app.put(r[]);
 }
 
-@safe unittest // issue 13300
+// https://issues.dlang.org/show_bug.cgi?id=13300
+@safe unittest
 {
     static test(bool isPurePostblit)()
     {
@@ -3686,7 +3696,8 @@ if (isDynamicArray!A)
     static assert(!__traits(compiles, () pure { test!false(); }));
 }
 
-@system unittest // issue 19572
+// https://issues.dlang.org/show_bug.cgi?id=19572
+@system unittest
 {
     static struct Struct
     {
@@ -3907,7 +3918,8 @@ Appender!(E[]) appender(A : E[], E)(auto ref A array)
     }
     catch (Exception) assert(0);
 
-    // Issue 5663 & 9725 tests
+    // https://issues.dlang.org/show_bug.cgi?id=5663
+    // https://issues.dlang.org/show_bug.cgi?id=9725
     static foreach (S; AliasSeq!(char[], const(char)[], string))
     {
         {
@@ -4022,11 +4034,11 @@ unittest
     }
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=10690
 @safe unittest
 {
     import std.algorithm;
     import std.typecons;
-    //10690
     [tuple(1)].filter!(t => true).array; // No error
     [tuple("A")].filter!(t => true).array; // error
 }
@@ -4096,9 +4108,9 @@ unittest
     a2.put([s2]);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=9528
 @safe unittest
 {
-    //9528
     const(E)[] fastCopy(E)(E[] src) {
             auto app = appender!(const(E)[])();
             foreach (i, e; src)
@@ -4114,10 +4126,10 @@ unittest
     assert(t.length == 1);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=10753
 @safe unittest
 {
     import std.algorithm.iteration : map;
-    //10753
     struct Foo {
        immutable dchar d;
     }
@@ -4237,7 +4249,7 @@ unittest
 
 @system unittest
 {
-    // Issue 13077
+    // https://issues.dlang.org/show_bug.cgi?id=13077
     static class A {}
 
     // reduced case
@@ -4336,7 +4348,8 @@ unittest
     assert(app3[] == [1, 2, 3]);
 }
 
-@safe unittest // issue 14605
+// https://issues.dlang.org/show_bug.cgi?id=14605
+@safe unittest
 {
     static assert(isOutputRange!(Appender!(int[]), int));
     static assert(isOutputRange!(RefAppender!(int[]), int));
@@ -4526,7 +4539,7 @@ nothrow pure @safe unittest
 // Tests that code compiles when there is an elaborate destructor and exceptions
 // are thrown. Unfortunately can't test that memory is initialized
 // before having a destructor called on it.
-// @system required because of issue 18872.
+// @system required because of https://issues.dlang.org/show_bug.cgi?id=18872.
 @system nothrow unittest
 {
     // exists only to allow doing something in the destructor. Not tested
diff --git a/std/base64.d b/std/base64.d
index 3991313f59a..cb8abad0540 100644
--- a/std/base64.d
+++ b/std/base64.d
@@ -476,12 +476,6 @@ template Base64Impl(char Map62th, char Map63th, char Padding = '=')
     size_t encode(R1, R2)(R1 source, auto ref R2 range)
         if (!isArray!R1 && isInputRange!R1 && is(ElementType!R1 : ubyte) &&
             hasLength!R1 && !is(R2 == char[]) && isOutputRange!(R2, char))
-    out(result)
-    {
-        // @@@BUG@@@ Workaround for DbC problem.
-        //assert(result == encodeLength(source.length), "The number of put is different from the length of Base64");
-    }
-    do
     {
         immutable srcLen = source.length;
         if (srcLen == 0)
@@ -1077,12 +1071,6 @@ template Base64Impl(char Map62th, char Map63th, char Padding = '=')
     {
         assert(buffer.length >= decodeLength(source.length), "Insufficient buffer for decoding");
     }
-    out(result)
-    {
-        // @@@BUG@@@ Workaround for DbC problem.
-        //immutable expect = decodeLength(source.length) - 2;
-        //assert(result.length >= expect, "The length of result is smaller than expected length");
-    }
     do
     {
         immutable srcLen = source.length;
@@ -1135,7 +1123,7 @@ template Base64Impl(char Map62th, char Map63th, char Padding = '=')
             }
         }
 
-        // @@@BUG@@@ Workaround for DbC problem.
+        // We need to do the check here because we have consumed the length
         version (StdUnittest)
             assert(
                 (bufptr - buffer.ptr) >= (decodeLength(srcLen) - 2),
@@ -1908,7 +1896,8 @@ class Base64Exception : Exception
         assert(tv["foobar"] == b.data); a.clear(); b.clear();
     }
 
-    // @@@9543@@@ These tests were disabled because they actually relied on the input range having length.
+    // https://issues.dlang.org/show_bug.cgi?id=9543
+    // These tests were disabled because they actually relied on the input range having length.
     // The implementation (currently) doesn't support encoding/decoding from a length-less source.
     version (none)
     { // with InputRange
diff --git a/std/bigint.d b/std/bigint.d
index 1f50e24fef0..53b88373212 100644
--- a/std/bigint.d
+++ b/std/bigint.d
@@ -311,7 +311,7 @@ public:
         assert(b == BigInt("200_002_469"));
     }
 
-    // Issue 16264
+    // https://issues.dlang.org/show_bug.cgi?id=16264
     @safe unittest
     {
         auto a = BigInt(
@@ -1607,7 +1607,7 @@ unittest
     assert(BigInt(-0x1234_5678_9ABC_5A5AL).toLong() == -0x1234_5678_9ABC_5A5AL);
     assert(BigInt(0xF234_5678_9ABC_5A5AL).toLong() == long.max);
     assert(BigInt(-0x123456789ABCL).toInt() == -int.max);
-    char[] s1 = "123".dup; // bug 8164
+    char[] s1 = "123".dup; // https://issues.dlang.org/show_bug.cgi?id=8164
     assert(BigInt(s1) == 123);
     char[] s2 = "0xABC".dup;
     assert(BigInt(s2) == 2748);
@@ -1619,10 +1619,10 @@ unittest
     b = long.max / a;
     assert( b == long.max /(ulong.max - 5));
     assert(BigInt(1) - 1 == 0);
-    assert((-4) % BigInt(5) == -4); // bug 5928
+    assert((-4) % BigInt(5) == -4); // https://issues.dlang.org/show_bug.cgi?id=5928
     assert(BigInt(-4) % BigInt(5) == -4);
-    assert(BigInt(2)/BigInt(-3) == BigInt(0)); // bug 8022
-    assert(BigInt("-1") > long.min); // bug 9548
+    assert(BigInt(2)/BigInt(-3) == BigInt(0)); // https://issues.dlang.org/show_bug.cgi?id=8022
+    assert(BigInt("-1") > long.min); // https://issues.dlang.org/show_bug.cgi?id=9548
 
     assert(toDecimalString(BigInt("0000000000000000000000000000000000000000001234567"))
         == "1234567");
@@ -1649,7 +1649,8 @@ unittest
     assert((BigInt(int.min)-1)%int.min == -1);
 }
 
-@safe unittest // Recursive division, bug 5568
+ // Recursive division (https://issues.dlang.org/show_bug.cgi?id=5568)
+@safe unittest
 {
     enum Z = 4843;
     BigInt m = (BigInt(1) << (Z*8) ) - 1;
@@ -1669,17 +1670,17 @@ unittest
     BigInt w =  c - b + a;
     assert(w % m == 0);
 
-    // Bug 6819. ^^
+    // https://issues.dlang.org/show_bug.cgi?id=6819
     BigInt z1 = BigInt(10)^^64;
     BigInt w1 = BigInt(10)^^128;
     assert(z1^^2 == w1);
     BigInt z2 = BigInt(1)<<64;
     BigInt w2 = BigInt(1)<<128;
     assert(z2^^2 == w2);
-    // Bug 7993
+    // https://issues.dlang.org/show_bug.cgi?id=7993
     BigInt n7793 = 10;
     assert( n7793 / 1 == 10);
-    // Bug 7973
+    // https://issues.dlang.org/show_bug.cgi?id=7973
     auto a7973 = 10_000_000_000_000_000;
     const c7973 = 10_000_000_000_000_000;
     immutable i7973 = 10_000_000_000_000_000;
@@ -1690,7 +1691,7 @@ unittest
     assert(v7973 == 2551700137);
     v7973 %= i7973;
     assert(v7973 == 2551700137);
-    // 8165
+    // https://issues.dlang.org/show_bug.cgi?id=8165
     BigInt[2] a8165;
     a8165[0] = a8165[1] = 1;
 }
@@ -1848,7 +1849,7 @@ unittest
     }
 }
 
-// 6448
+// https://issues.dlang.org/show_bug.cgi?id=6448
 @safe unittest
 {
     import std.array;
@@ -1862,7 +1863,7 @@ unittest
     BigInt bx = x;
     formattedWrite(w2, "%010d", bx);
     assert(w1.data == w2.data);
-    //8011
+    // https://issues.dlang.org/show_bug.cgi?id=8011
     BigInt y = -3;
     ++y;
     assert(y.toLong() == -2);
@@ -1878,12 +1879,12 @@ unittest
 @safe unittest
 {
     import std.math : abs;
-    auto r = abs(BigInt(-1000)); // 6486
+    auto r = abs(BigInt(-1000)); // https://issues.dlang.org/show_bug.cgi?id=6486
     assert(r == 1000);
 
-    auto r2 = abs(const(BigInt)(-500)); // 11188
+    auto r2 = abs(const(BigInt)(-500)); // https://issues.dlang.org/show_bug.cgi?id=11188
     assert(r2 == 500);
-    auto r3 = abs(immutable(BigInt)(-733)); // 11188
+    auto r3 = abs(immutable(BigInt)(-733)); // https://issues.dlang.org/show_bug.cgi?id=11188
     assert(r3 == 733);
 
     // opCast!bool
@@ -1891,7 +1892,8 @@ unittest
     assert(one && !zero);
 }
 
-@safe unittest // 6850
+// https://issues.dlang.org/show_bug.cgi?id=6850
+@safe unittest
 {
     pure long pureTest() {
         BigInt a = 1;
@@ -1903,7 +1905,9 @@ unittest
     assert(pureTest() == 1337);
 }
 
-@safe unittest // 8435 & 10118
+// https://issues.dlang.org/show_bug.cgi?id=8435
+// https://issues.dlang.org/show_bug.cgi?id=10118
+@safe unittest
 {
     auto i = BigInt(100);
     auto j = BigInt(100);
@@ -1927,7 +1931,8 @@ unittest
     assert(keys.empty);
 }
 
-@safe unittest // 11148
+// https://issues.dlang.org/show_bug.cgi?id=11148
+@safe unittest
 {
     void foo(BigInt) {}
     const BigInt cbi = 3;
@@ -1965,14 +1970,16 @@ unittest
     assert(n == 4);
 }
 
-@safe unittest // 8167
+// https://issues.dlang.org/show_bug.cgi?id=8167
+@safe unittest
 {
     BigInt a = BigInt(3);
     BigInt b = BigInt(a);
     assert(b == 3);
 }
 
-@safe unittest // 9061
+// https://issues.dlang.org/show_bug.cgi?id=9061
+@safe unittest
 {
     long l1 = 0x12345678_90ABCDEF;
     long l2 = 0xFEDCBA09_87654321;
@@ -1991,7 +1998,8 @@ unittest
     assert(l5 == b5);
 }
 
-@safe unittest // 11600
+// https://issues.dlang.org/show_bug.cgi?id=11600
+@safe unittest
 {
     import std.conv;
     import std.exception : assertThrown;
@@ -2006,13 +2014,15 @@ unittest
     assertThrown!ConvException(to!BigInt("-123four"));
 }
 
-@safe unittest // 11583
+// https://issues.dlang.org/show_bug.cgi?id=11583
+@safe unittest
 {
     BigInt x = 0;
     assert((x > 0) == false);
 }
 
-@safe unittest // 13391
+// https://issues.dlang.org/show_bug.cgi?id=13391
+@safe unittest
 {
     BigInt x1 = "123456789";
     BigInt x2 = "123456789123456789";
@@ -2043,7 +2053,8 @@ unittest
     assert(x2 == 1);
 }
 
-@safe unittest // 13963
+// https://issues.dlang.org/show_bug.cgi?id=13963
+@safe unittest
 {
     BigInt x = 1;
     import std.meta : AliasSeq;
@@ -2094,7 +2105,8 @@ unittest
     assert(-x2 % ulong.max == -x2);
 }
 
-@safe unittest // 14124
+// https://issues.dlang.org/show_bug.cgi?id=14124
+@safe unittest
 {
     auto x = BigInt(-3);
     x %= 3;
@@ -2117,7 +2129,7 @@ unittest
     assert(x.isZero());
 }
 
-// issue 15678
+// https://issues.dlang.org/show_bug.cgi?id=15678
 @safe unittest
 {
     import std.exception : assertThrown;
@@ -2126,7 +2138,7 @@ unittest
     assertThrown!ConvException(BigInt("1234PUKE"));
 }
 
-// Issue 6447
+// https://issues.dlang.org/show_bug.cgi?id=6447
 @safe unittest
 {
     import std.algorithm.comparison : equal;
@@ -2142,14 +2154,15 @@ unittest
     ]));
 }
 
-// Issue 17330
+// https://issues.dlang.org/show_bug.cgi?id=17330
 @safe unittest
 {
     auto b = immutable BigInt("123");
     assert(b == 123);
 }
 
-@safe pure unittest // issue 14767
+// https://issues.dlang.org/show_bug.cgi?id=14767
+@safe pure unittest
 {
     static immutable a = BigInt("340282366920938463463374607431768211455");
     assert(a == BigInt("340282366920938463463374607431768211455"));
@@ -2197,7 +2210,7 @@ void divMod(const BigInt dividend, const BigInt divisor, out BigInt quotient, ou
     assert(q * b + r == a);
 }
 
-// Issue 18086
+// https://issues.dlang.org/show_bug.cgi?id=18086
 @safe pure nothrow unittest
 {
     BigInt q = 1;
@@ -2226,7 +2239,7 @@ void divMod(const BigInt dividend, const BigInt divisor, out BigInt quotient, ou
     assert(q * d + r == -c);
 }
 
-// Issue 19740
+// https://issues.dlang.org/show_bug.cgi?id=19740
 @safe unittest
 {
     BigInt a = BigInt(
diff --git a/std/bitmanip.d b/std/bitmanip.d
index 5f0c8dbccea..bd642130f49 100644
--- a/std/bitmanip.d
+++ b/std/bitmanip.d
@@ -397,7 +397,9 @@ if (is(T == class))
 @safe pure nothrow @nogc
 unittest
 {
-    // Degenerate bitfields (#8474 / #11160) tests mixed with range tests
+    // Degenerate bitfields tests mixed with range tests
+    // https://issues.dlang.org/show_bug.cgi?id=8474
+    // https://issues.dlang.org/show_bug.cgi?id=11160
     struct Test1
     {
         mixin(bitfields!(uint, "a", 32,
@@ -525,9 +527,9 @@ unittest
     static assert(!__traits(compiles, bar(s)));
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=6686
 @safe unittest
 {
-    // Bug #6686
     union  S {
         ulong bits = ulong.max;
         mixin (bitfields!(
@@ -542,9 +544,9 @@ unittest
     assert(num.bits == 0xFFFF_FFFF_8000_0001uL);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=5942
 @safe unittest
 {
-    // Bug #5942
     struct S
     {
         mixin(bitfields!(
@@ -607,7 +609,7 @@ unittest
         assert(i.checkExpectations(true, 7, 7));
     }
 
-    //Bug# 8876
+    //https://issues.dlang.org/show_bug.cgi?id=8876
     {
         struct MoreIntegrals {
             bool checkExpectations(uint eu, ushort es, uint ei) { return u == eu && s == es && i == ei; }
@@ -660,7 +662,7 @@ unittest
     assert(f.checkExpectations(true));
 }
 
-// Issue 12477
+// https://issues.dlang.org/show_bug.cgi?id=12477
 @system unittest
 {
     import core.exception : AssertError;
@@ -868,9 +870,9 @@ struct DoubleRep
     assert(x.value == -5.0);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=15305
 @safe unittest
 {
-    // Issue #15305
     struct S {
             mixin(bitfields!(
                     bool, "alice", 1,
@@ -1126,7 +1128,7 @@ public:
         return _len;
     }
 
-    // Issue 20240
+    // https://issues.dlang.org/show_bug.cgi?id=20240
     @system unittest
     {
         BitArray ba;
@@ -2382,7 +2384,7 @@ public:
         }
     }
 
-    // Issue 17467
+    // https://issues.dlang.org/show_bug.cgi?id=17467
     @system unittest
     {
         import std.algorithm.comparison : equal;
@@ -2403,7 +2405,8 @@ public:
         assert(equal(b.bitsSet, iota(64, 128)));
     }
 
-    // Issue 18134 - shifting right when length is a multiple of 8 * size_t.sizeof.
+    // https://issues.dlang.org/show_bug.cgi?id=18134
+    // shifting right when length is a multiple of 8 * size_t.sizeof.
     @system unittest
     {
         import std.algorithm.comparison : equal;
@@ -2613,7 +2616,7 @@ public:
         assert(b.bitsSet.equal(iota(wordBits * 2)));
     }
 
-    // Issue 20241
+    // https://issues.dlang.org/show_bug.cgi?id=20241
     @system unittest
     {
         BitArray ba;
@@ -2827,7 +2830,7 @@ if (isIntegral!T || isSomeChar!T || isBoolean!T)
         static if (isSigned!T)
             assert(swapEndian(swapEndian(cast(T) 0)) == 0);
 
-        // used to trigger BUG6354
+        // used to trigger https://issues.dlang.org/show_bug.cgi?id=6354
         static if (T.sizeof > 1 && isUnsigned!T)
         {
             T left = 0xffU;
@@ -3838,7 +3841,7 @@ if (canSwapEndianness!T && isInputRange!R && is(ElementType!R : const ubyte))
     }
 }
 
-// issue 17247
+// https://issues.dlang.org/show_bug.cgi?id=17247
 @safe unittest
 {
     struct UbyteRange
diff --git a/std/complex.d b/std/complex.d
index 73bafbb2867..b9e597a297b 100644
--- a/std/complex.d
+++ b/std/complex.d
@@ -1013,7 +1013,8 @@ Complex!T sqrt(T)(Complex!T z)  @safe pure nothrow @nogc
     assert(approxEqual(c2s.im, 0.8836155));
 }
 
-// Issue 10881: support %f formatting of complex numbers
+// support %f formatting of complex numbers
+// https://issues.dlang.org/show_bug.cgi?id=10881
 @safe unittest
 {
     import std.format : format;
diff --git a/std/concurrency.d b/std/concurrency.d
index 44fb99b57ec..e63ac97379d 100644
--- a/std/concurrency.d
+++ b/std/concurrency.d
@@ -98,9 +98,9 @@ private
         static assert(!hasLocalAliasing!(Tid, Container, int));
     }
 
+    // https://issues.dlang.org/show_bug.cgi?id=20097
     @safe unittest
     {
-        /* Issue 20097 */
         import std.datetime.systime : SysTime;
         static struct Container { SysTime time; }
         static assert(!hasLocalAliasing!(SysTime, Container));
@@ -1164,7 +1164,7 @@ struct ThreadInfo
         unregisterMe(this); // clean up registry entries
     }
 
-    // issue 20160
+    // https://issues.dlang.org/show_bug.cgi?id=20160
     @system unittest
     {
         register("main_thread", thisTid());
diff --git a/std/container/array.d b/std/container/array.d
index 85c1246dab3..436afde851f 100644
--- a/std/container/array.d
+++ b/std/container/array.d
@@ -80,7 +80,7 @@ pure @system unittest
 
 private struct RangeT(A)
 {
-    /* Workaround for Issue 13629 at https://issues.dlang.org/show_bug.cgi?id=13629
+    /* Workaround for https://issues.dlang.org/show_bug.cgi?id=13629
        See also: http://forum.dlang.org/post/vbmwhzvawhnkoxrhbnyb@forum.dlang.org
     */
     private A[1] _outer_;
@@ -1280,7 +1280,8 @@ if (!is(Unqual!T == bool))
     assert(a.length == 7);
     assert(equal(a[1 .. 4], [1, 2, 3]));
 }
-// Test issue 5920
+
+// https://issues.dlang.org/show_bug.cgi?id=5920
 @system unittest
 {
     struct structBug5920
@@ -1319,7 +1320,9 @@ if (!is(Unqual!T == bool))
     }
     assert(dMask == 0b1111_1111);   // make sure the d'tor is called once only.
 }
-// Test issue 5792 (mainly just to check if this piece of code is compilable)
+
+// Test for https://issues.dlang.org/show_bug.cgi?id=5792
+// (mainly just to check if this piece of code is compilable)
 @system unittest
 {
     auto a = Array!(int[])([[1,2],[3,4]]);
@@ -1478,7 +1481,8 @@ if (!is(Unqual!T == bool))
     arr ~= s;
 }
 
-@safe unittest //11459
+// https://issues.dlang.org/show_bug.cgi?id=11459
+@safe unittest
 {
     static struct S
     {
@@ -1489,18 +1493,21 @@ if (!is(Unqual!T == bool))
     alias B = Array!(shared bool);
 }
 
-@system unittest //11884
+// https://issues.dlang.org/show_bug.cgi?id=11884
+@system unittest
 {
     import std.algorithm.iteration : filter;
     auto a = Array!int([1, 2, 2].filter!"true"());
 }
 
-@safe unittest //8282
+// https://issues.dlang.org/show_bug.cgi?id=8282
+@safe unittest
 {
     auto arr = new Array!int;
 }
 
-@system unittest //6998
+// https://issues.dlang.org/show_bug.cgi?id=6998
+@system unittest
 {
     static int i = 0;
     class C
@@ -1525,7 +1532,9 @@ if (!is(Unqual!T == bool))
     //Just to make sure the GC doesn't collect before the above test.
     assert(c.dummy == 1);
 }
-@system unittest //6998-2
+
+//https://issues.dlang.org/show_bug.cgi?id=6998 (2)
+@system unittest
 {
     static class C {int i;}
     auto c = new C;
@@ -1586,7 +1595,7 @@ if (!is(Unqual!T == bool))
 }
 
 /**
- * issue 20589 - typeof may give wrong result in case of classes defining `opCall` operator
+ * typeof may give wrong result in case of classes defining `opCall` operator
  * https://issues.dlang.org/show_bug.cgi?id=20589
  *
  * destructor std.container.array.Array!(MyClass).Array.~this is @system
@@ -2248,7 +2257,7 @@ if (is(Unqual!T == bool))
     slice.front = true;
     slice.back = true;
     slice[1] = true;
-    slice = slice[0 .. $]; // bug 19171
+    slice = slice[0 .. $]; // https://issues.dlang.org/show_bug.cgi?id=19171
     assert(slice.front == true);
     assert(slice.back == true);
     assert(slice[1] == true);
@@ -2257,7 +2266,8 @@ if (is(Unqual!T == bool))
     assert(slice.moveAt(1) == true);
 }
 
-// issue 16331 - uncomparable values are valid values for an array
+// uncomparable values are valid values for an array
+// https://issues.dlang.org/show_bug.cgi?id=16331
 @system unittest
 {
     double[] values = [double.nan, double.nan];
@@ -2518,7 +2528,8 @@ if (is(Unqual!T == bool))
     assert(arr[1] == [4, 5, 6]);
 }
 
-// Issue 13642 - Change of length reallocates without calling GC.
+// Change of length reallocates without calling GC.
+// https://issues.dlang.org/show_bug.cgi?id=13642
 @system unittest
 {
     import core.memory;
diff --git a/std/container/binaryheap.d b/std/container/binaryheap.d
index 3e0badba938..e763357a012 100644
--- a/std/container/binaryheap.d
+++ b/std/container/binaryheap.d
@@ -480,7 +480,8 @@ BinaryHeap!(Store, less) heapify(alias less = "a < b", Store)(Store s,
     assert(h.equal([16, 14, 10, 9, 8, 7, 4, 3, 2, 1]));
 }
 
-@system unittest // 15675
+// https://issues.dlang.org/show_bug.cgi?id=15675
+@system unittest
 {
     import std.container.array : Array;
 
@@ -489,7 +490,8 @@ BinaryHeap!(Store, less) heapify(alias less = "a < b", Store)(Store s,
     assert(heap.front == 12);
 }
 
-@system unittest // 16072
+// https://issues.dlang.org/show_bug.cgi?id=16072
+@system unittest
 {
     auto q = heapify!"a > b"([2, 4, 5]);
     q.insert(1);
@@ -584,7 +586,8 @@ BinaryHeap!(Store, less) heapify(alias less = "a < b", Store)(Store s,
     assert(equal(b, [10, 9, 8, 7, 6, 6, 7, 8, 9, 10]));
 }
 
-@system unittest // Issue 17314
+// https://issues.dlang.org/show_bug.cgi?id=17314
+@system unittest
 {
     import std.algorithm.comparison : equal;
     int[] a = [5];
diff --git a/std/container/dlist.d b/std/container/dlist.d
index c0b60367554..2f67d761822 100644
--- a/std/container/dlist.d
+++ b/std/container/dlist.d
@@ -986,7 +986,7 @@ private:
     assert(r.back == 1);
 }
 
-// Issue 8895
+// https://issues.dlang.org/show_bug.cgi?id=8895
 @safe unittest
 {
     auto a = make!(DList!int)(1,2,3,4);
@@ -1057,7 +1057,7 @@ private:
 {
     import std.algorithm.comparison : equal;
 
-    //8905
+    // https://issues.dlang.org/show_bug.cgi?id=8905
     auto a = DList!int([1, 2, 3, 4]);
     auto r = a[];
     a.stableRemoveBack();
@@ -1065,7 +1065,8 @@ private:
     assert(a[].equal([1, 2, 3, 7]));
 }
 
-@safe unittest //12566
+// https://issues.dlang.org/show_bug.cgi?id=12566
+@safe unittest
 {
     auto dl2 = DList!int([2,7]);
     dl2.removeFront();
@@ -1074,14 +1075,16 @@ private:
     assert(dl2.empty, "not empty?!");
 }
 
-@safe unittest //13076
+// https://issues.dlang.org/show_bug.cgi?id=13076
+@safe unittest
 {
     DList!int list;
     assert(list.empty);
     list.clear();
 }
 
-@safe unittest //13425
+// https://issues.dlang.org/show_bug.cgi?id=13425
+@safe unittest
 {
     import std.range : drop, take;
     auto list = DList!int([1,2,3,4,5]);
@@ -1091,7 +1094,8 @@ private:
     assert(r.empty); // fails
 }
 
-@safe unittest //14300
+// https://issues.dlang.org/show_bug.cgi?id=14300
+@safe unittest
 {
     interface ITest {}
     static class Test : ITest {}
@@ -1099,7 +1103,8 @@ private:
     DList!ITest().insertBack(new Test());
 }
 
-@safe unittest //15263
+// https://issues.dlang.org/show_bug.cgi?id=15263
+@safe unittest
 {
     import std.range : iota;
     auto a = DList!int();
diff --git a/std/container/rbtree.d b/std/container/rbtree.d
index 6540f93d958..b61ce4b3216 100644
--- a/std/container/rbtree.d
+++ b/std/container/rbtree.d
@@ -542,7 +542,8 @@ struct RBNode(V)
                 _parent.right = null;
         }
 
-        // clean references to help GC - Bugzilla 12915
+        // clean references to help GC
+        // https://issues.dlang.org/show_bug.cgi?id=12915
         _left = _right = _parent = null;
 
         return ret;
@@ -1948,7 +1949,7 @@ assert(equal(rbt[], [5]));
     test!byte();
 }
 
-// issue 19626
+// https://issues.dlang.org/show_bug.cgi?id=19626
 @safe pure unittest
 {
     enum T { a, b }
@@ -2185,14 +2186,15 @@ if ( is(typeof(binaryFun!less((ElementType!Stuff).init, (ElementType!Stuff).init
     assert(rt1.upperBound(2).equal([3, 4, 5]));
 }
 
-// issue 15941
+// =https://issues.dlang.org/show_bug.cgi?id=issue 15941
 @safe pure unittest
 {
     class C {}
     RedBlackTree!(C, "cast(void*)a < cast(void*) b") tree;
 }
 
-@safe pure unittest // const/immutable elements (issue 17519)
+// const/immutable elements (https://issues.dlang.org/show_bug.cgi?id=17519)
+@safe pure unittest
 {
     RedBlackTree!(immutable int) t1;
     RedBlackTree!(const int) t2;
diff --git a/std/container/slist.d b/std/container/slist.d
index b494915dc16..0b504b474a8 100644
--- a/std/container/slist.d
+++ b/std/container/slist.d
@@ -879,9 +879,9 @@ Complexity: $(BIGOH n)
     auto s = make!(SList!int)(1, 2, 3);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=5193
 @safe unittest
 {
-    // 5193
     static struct Data
     {
         const int val;
@@ -899,17 +899,17 @@ Complexity: $(BIGOH n)
     assert(r.front == 1);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=14920
 @safe unittest
 {
-    // issue 14920
     SList!int s;
     s.insertAfter(s[], 1);
     assert(s.front == 1);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=15659
 @safe unittest
 {
-    // issue 15659
     SList!int s;
     s.clear();
 }
diff --git a/std/container/util.d b/std/container/util.d
index 8a2a67b189e..cc273a24b71 100644
--- a/std/container/util.d
+++ b/std/container/util.d
@@ -32,7 +32,7 @@ if (is(T == struct) || is(T == class))
         // does not initialize its payload and is equivalent
         // to a null reference. We therefore construct an empty container
         // by passing an empty array to its constructor.
-        // Issue #13872.
+        // https://issues.dlang.org/show_bug.cgi?id=13872.
         static if (arguments.length == 0)
         {
             import std.range.primitives : ElementType;
@@ -84,7 +84,7 @@ if (is(T == struct) || is(T == class))
     assert(equal(rtb2[], "ehlo"d));
 }
 
-// Issue 8895
+// https://issues.dlang.org/show_bug.cgi?id=8895
 @safe unittest
 {
     import std.algorithm.comparison : equal;
@@ -162,7 +162,7 @@ if (!is(Container))
     assert(equal(rbtmin[], [1, 2, 3]));
 }
 
-// Issue 13872
+// https://issues.dlang.org/show_bug.cgi?id=13872
 @system unittest
 {
     import std.container;
diff --git a/std/conv.d b/std/conv.d
index 289aa6602f8..add6b7aa181 100644
--- a/std/conv.d
+++ b/std/conv.d
@@ -137,7 +137,7 @@ private
     T toStr(T, S)(S src)
     if (isSomeString!T)
     {
-        // workaround for Bugzilla 14198
+        // workaround for https://issues.dlang.org/show_bug.cgi?id=14198
         static if (is(S == bool) && is(typeof({ T s = "string"; })))
         {
             return src ? "true" : "false";
@@ -548,9 +548,10 @@ if (isImplicitlyConvertible!(S, T) &&
     return value;
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=9523: Allow identity enum conversion
 @safe pure nothrow unittest
 {
-    enum E { a }  // Issue 9523 - Allow identity enum conversion
+    enum E { a }
     auto e = to!E(E.a);
     assert(e == E.a);
 }
@@ -562,7 +563,7 @@ if (isImplicitlyConvertible!(S, T) &&
     assert(a == b);
 }
 
-// Tests for issue 6377
+// https://issues.dlang.org/show_bug.cgi?id=6377
 @safe pure unittest
 {
     import std.exception;
@@ -709,7 +710,7 @@ if (!isImplicitlyConvertible!(S, T) &&
     return T(value);
 }
 
-// Bugzilla 3961
+// https://issues.dlang.org/show_bug.cgi?id=3961
 @safe pure unittest
 {
     struct Int
@@ -738,7 +739,7 @@ if (!isImplicitlyConvertible!(S, T) &&
     Int3 i3 = to!Int3(1);
 }
 
-// Bugzilla 6808
+// https://issues.dlang.org/show_bug.cgi?id=6808
 @safe pure unittest
 {
     static struct FakeBigInt
@@ -1050,13 +1051,13 @@ if (!(isImplicitlyConvertible!(S, T) &&
     }
 }
 
-// Bugzilla 14042
+// https://issues.dlang.org/show_bug.cgi?id=14042
 @system unittest
 {
     immutable(char)* ptr = "hello".ptr;
     auto result = ptr.to!(char[]);
 }
-// Bugzilla 8384
+// https://issues.dlang.org/show_bug.cgi?id=8384
 @system unittest
 {
     void test1(T)(T lp, string cmp)
@@ -1103,7 +1104,7 @@ if (!(isImplicitlyConvertible!(S, T) &&
     return w.data;
 }
 
-// Bugzilla 16108
+// https://issues.dlang.org/show_bug.cgi?id=16108
 @system unittest
 {
     static struct A
@@ -1131,7 +1132,7 @@ if (!(isImplicitlyConvertible!(S, T) &&
     assert(to!string(b) == "B(0, false)");
 }
 
-// Bugzilla 20070
+// https://issues.dlang.org/show_bug.cgi?id=20070
 @safe unittest
 {
     void writeThem(T)(ref inout(T) them)
@@ -1304,7 +1305,7 @@ if (is (T == immutable) && isExactSomeString!T && is(S == enum))
     a = new A;
     assert(to!string(a) == "an A");
 
-    // Bug 7660
+    // https://issues.dlang.org/show_bug.cgi?id=7660
     class C { override string toString() const { return "C"; } }
     struct S { C c; alias c this; }
     S s; s.c = new C();
@@ -1344,7 +1345,8 @@ if (is (T == immutable) && isExactSomeString!T && is(S == enum))
     // Conversion representing enum value with string
     enum EB : bool { a = true }
     enum EU : uint { a = 0, b = 1, c = 2 }  // base type is unsigned
-    enum EI : int { a = -1, b = 0, c = 1 }  // base type is signed (bug 7909)
+    // base type is signed (https://issues.dlang.org/show_bug.cgi?id=7909)
+    enum EI : int { a = -1, b = 0, c = 1 }
     enum EF : real { a = 1.414, b = 1.732, c = 2.236 }
     enum EC : char { a = 'x', b = 'y' }
     enum ES : string { a = "aaa", b = "bbb" }
@@ -1637,7 +1639,7 @@ if (!isImplicitlyConvertible!(S, T) &&
     auto f = to!(float[][])(e);
     assert(f[0] == b && f[1] == b);
 
-    // Test for bug 8264
+    // Test for https://issues.dlang.org/show_bug.cgi?id=8264
     struct Wrap
     {
         string wrap;
@@ -1645,7 +1647,7 @@ if (!isImplicitlyConvertible!(S, T) &&
     }
     Wrap[] warr = to!(Wrap[])(["foo", "bar"]);  // should work
 
-    // Issue 12633
+    // https://issues.dlang.org/show_bug.cgi?id=12633
     import std.conv : to;
     const s2 = ["10", "20"];
 
@@ -1704,7 +1706,9 @@ if (!isImplicitlyConvertible!(S, T) && isAssociativeArray!S &&
     auto b = to!(double[dstring])(a);
     assert(b["0"d] == 1 && b["1"d] == 2);
 }
-@safe unittest // Bugzilla 8705, from doc
+
+// https://issues.dlang.org/show_bug.cgi?id=8705, from doc
+@safe unittest
 {
     import std.exception;
     int[string][double[int[]]] a;
@@ -1950,7 +1954,8 @@ if (isInputRange!S && !isInfinite!S && isSomeChar!(ElementEncodingType!S) &&
 
 @safe pure unittest
 {
-    // Issue 6668 - ensure no collaterals thrown
+    // https://issues.dlang.org/show_bug.cgi?id=6668
+    // ensure no collaterals thrown
     try { to!uint("-1"); }
     catch (ConvException e) { assert(e.next is null); }
 }
@@ -1964,12 +1969,12 @@ if (isInputRange!S && !isInfinite!S && isSomeChar!(ElementEncodingType!S) &&
         assert(to!double(a) == 123);
     }}
 
-    // 6255
+    // https://issues.dlang.org/show_bug.cgi?id=6255
     auto n = to!int("FF", 16);
     assert(n == 255);
 }
 
-// bugzilla 15800
+// https://issues.dlang.org/show_bug.cgi?id=15800
 @safe unittest
 {
     import std.utf : byCodeUnit, byChar, byWchar, byDchar;
@@ -2123,7 +2128,7 @@ template roundTo(Target)
     assert(ex.msg == "Input was NaN");
 }
 
-// issue 5232
+// https://issues.dlang.org/show_bug.cgi?id=5232
 @safe pure unittest
 {
     static if (real.mant_dig >= 64)
@@ -2610,7 +2615,7 @@ Lerr:
     assertCTFEable!({ string s =  "1234abc"; assert(parse!uint(s) ==  1234 && s == "abc"); });
 }
 
-// Issue 13931
+// https://issues.dlang.org/show_bug.cgi?id=13931
 @safe pure unittest
 {
     import std.exception;
@@ -2619,7 +2624,7 @@ Lerr:
     assertThrown!ConvOverflowException("-92233720368547758080".to!long());
 }
 
-// Issue 14396
+// https://issues.dlang.org/show_bug.cgi?id=14396
 @safe pure unittest
 {
     struct StrInputRange
@@ -2635,7 +2640,7 @@ Lerr:
     assert(parse!int(input) == 777);
 }
 
-// issue 9621
+// https://issues.dlang.org/show_bug.cgi?id=9621
 @safe pure unittest
 {
     string s1 = "[ \"\\141\", \"\\0\", \"\\41\", \"\\418\" ]";
@@ -2731,13 +2736,14 @@ do
     assert(parse!int(s = "765", 8) == octal!765);
     assert(parse!int(s = "fCDe", 16) == 0xfcde);
 
-    // 6609
+    // https://issues.dlang.org/show_bug.cgi?id=6609
     assert(parse!int(s = "-42", 10) == -42);
 
     assert(parse!ubyte(s = "ff", 16) == 0xFF);
 }
 
-@safe pure unittest // bugzilla 7302
+// https://issues.dlang.org/show_bug.cgi?id=7302
+@safe pure unittest
 {
     import std.range : cycle;
     auto r = cycle("2A!");
@@ -2746,20 +2752,23 @@ do
     assert(r.front == '!');
 }
 
-@safe pure unittest // bugzilla 13163
+// https://issues.dlang.org/show_bug.cgi?id=13163
+@safe pure unittest
 {
     import std.exception;
     foreach (s; ["fff", "123"])
         assertThrown!ConvOverflowException(s.parse!ubyte(16));
 }
 
-@safe pure unittest // bugzilla 17282
+// https://issues.dlang.org/show_bug.cgi?id=17282
+@safe pure unittest
 {
     auto str = "0=\x00\x02\x55\x40&\xff\xf0\n\x00\x04\x55\x40\xff\xf0~4+10\n";
     assert(parse!uint(str) == 0);
 }
 
-@safe pure unittest // bugzilla 18248
+// https://issues.dlang.org/show_bug.cgi?id=18248
+@safe pure unittest
 {
     import std.exception : assertThrown;
 
@@ -2840,7 +2849,8 @@ if (isSomeString!Source && !is(Source == enum) &&
     }
 }
 
-@safe pure unittest // bugzilla 4744
+// https://issues.dlang.org/show_bug.cgi?id=4744
+@safe pure unittest
 {
     enum A { member1, member11, member111 }
     assert(to!A("member1"  ) == A.member1  );
@@ -3400,7 +3410,7 @@ if (isInputRange!Source && isSomeChar!(ElementType!Source) && !is(Source == enum
 {
     import std.exception;
 
-    // Bugzilla 4959
+    // https://issues.dlang.org/show_bug.cgi?id=4959
     {
         auto s = "0 ";
         auto x = parse!double(s);
@@ -3408,19 +3418,19 @@ if (isInputRange!Source && isSomeChar!(ElementType!Source) && !is(Source == enum
         assert(x == 0.0);
     }
 
-    // Bugzilla 3369
+    // https://issues.dlang.org/show_bug.cgi?id=3369
     assert(to!float("inf") == float.infinity);
     assert(to!float("-inf") == -float.infinity);
 
-    // Bugzilla 6160
+    // https://issues.dlang.org/show_bug.cgi?id=6160
     assert(6_5.536e3L == to!real("6_5.536e3"));                     // 2^16
     assert(0x1000_000_000_p10 == to!real("0x1000_000_000_p10"));    // 7.03687e+13
 
-    // Bugzilla 6258
+    // https://issues.dlang.org/show_bug.cgi?id=6258
     assertThrown!ConvException(to!real("-"));
     assertThrown!ConvException(to!real("in"));
 
-    // Bugzilla 7055
+    // https://issues.dlang.org/show_bug.cgi?id=7055
     assertThrown!ConvException(to!float("INF2"));
 
     //extra stress testing
@@ -3671,7 +3681,8 @@ if (isSomeString!Source && !is(Source == enum) &&
     assert(a2 == ["aaa", "bbb", "ccc"]);
 }
 
-@safe unittest // Bugzilla 9615
+// https://issues.dlang.org/show_bug.cgi?id=9615
+@safe unittest
 {
     string s0 = "[1,2, ]";
     string s1 = "[1,2, \t\v\r\n]";
@@ -4003,16 +4014,18 @@ if (isInputRange!Source && isSomeChar!(ElementType!Source))
         `\"`, `\'`, `\?`, `\\`, `\a`, `\b`, `\f`, `\n`, `\r`, `\t`, `\v`, //Normal escapes
         `\141`,
         `\x61`,
-        `\u65E5`, `\U00012456`
-        //`\&amp;`, `\&quot;`, //@@@9621@@@ Named Character Entities.
+        `\u65E5`, `\U00012456`,
+         // https://issues.dlang.org/show_bug.cgi?id=9621 (Named Character Entities)
+        //`\&amp;`, `\&quot;`,
     ];
 
     const(dchar)[] s2 = [
         '\"', '\'', '\?', '\\', '\a', '\b', '\f', '\n', '\r', '\t', '\v', //Normal escapes
         '\141',
         '\x61',
-        '\u65E5', '\U00012456'
-        //'\&amp;', '\&quot;', //@@@9621@@@ Named Character Entities.
+        '\u65E5', '\U00012456',
+        // https://issues.dlang.org/show_bug.cgi?id=9621 (Named Character Entities)
+        //'\&amp;', '\&quot;',
     ];
 
     foreach (i ; 0 .. s1.length)
@@ -4876,9 +4889,8 @@ if (!is(T == class))
     assert(u1.a == "hello");
 }
 
-
-
-@system unittest // bugzilla 15772
+ // https://issues.dlang.org/show_bug.cgi?id=15772
+@system unittest
 {
     abstract class Foo {}
     class Bar: Foo {}
@@ -5097,8 +5109,6 @@ if (!is(T == class))
 //postblit precedence
 @system unittest
 {
-    //Works, but breaks in "-w -O" because of @@@9332@@@.
-    //Uncomment test when 9332 is fixed.
     static struct S
     {
         int i;
@@ -5485,7 +5495,8 @@ version (StdUnittest)
     }
 }
 
-@safe unittest //@@@9559@@@
+// https://issues.dlang.org/show_bug.cgi?id=9959
+@safe unittest
 {
     import std.algorithm.iteration : map;
     import std.array : array;
@@ -5702,9 +5713,9 @@ pure nothrow @safe /* @nogc */ unittest
     static assert(!__traits(compiles, emplaceRef(uninitializedUnsafeArr, unsafeArr)));
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=15313
 @system unittest
 {
-    // Issue 15313
     static struct Node
     {
         int payload;
@@ -5722,10 +5733,6 @@ pure nothrow @safe /* @nogc */ unittest
     assert(n.refs == 10);
 }
 
-@system unittest
-{
-}
-
 @system unittest
 {
     class A
@@ -5759,7 +5766,7 @@ pure nothrow @safe /* @nogc */ unittest
 {
     import std.algorithm.comparison : equal;
     import std.algorithm.iteration : map;
-    // Check fix for http://d.puremagic.com/issues/show_bug.cgi?id=2971
+    // Check fix for https://issues.dlang.org/show_bug.cgi?id=2971
     assert(equal(map!(to!int)(["42", "34", "345"]), [42, 34, 345]));
 }
 
@@ -5928,9 +5935,9 @@ if (isIntegral!T)
     }
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=10874
 @safe unittest
 {
-    // issue 10874
     enum Test { a = 0 }
     ulong l = 0;
     auto t = l.to!Test;
diff --git a/std/csv.d b/std/csv.d
index cd21c34efa3..2f2db979605 100644
--- a/std/csv.d
+++ b/std/csv.d
@@ -124,7 +124,8 @@ class CSVException : Exception
     ///
     size_t row, col;
 
-    // FIXME: Use std.exception.basicExceptionCtors here once bug #11500 is fixed
+    // FIXME: Use std.exception.basicExceptionCtors here once
+    // https://issues.dlang.org/show_bug.cgi?id=11500 is fixed
 
     this(string msg, string file = __FILE__, size_t line = __LINE__,
          Throwable next = null) @nogc @safe pure nothrow
@@ -1163,7 +1164,7 @@ public:
     }
 }
 
-// Bugzilla 15545
+// https://issues.dlang.org/show_bug.cgi?id=15545
 // @system due to the catch for Throwable
 @system pure unittest
 {
@@ -1717,7 +1718,7 @@ if (isSomeChar!Separator && isInputRange!Range
     assert(a.data == ""d);
 }
 
-// Bugzilla 8908
+// https://issues.dlang.org/show_bug.cgi?id=8908
 @safe pure unittest
 {
     string csv = `  1.0, 2.0, 3.0
diff --git a/std/datetime/date.d b/std/datetime/date.d
index d73b3e62087..0bc9285216a 100644
--- a/std/datetime/date.d
+++ b/std/datetime/date.d
@@ -3225,7 +3225,7 @@ public:
         assert(DateTime.fromISOString(" 19990706T123033 ") == DateTime(Date(1999, 7, 6), TimeOfDay(12, 30, 33)));
     }
 
-    // bug# 17801
+    // https://issues.dlang.org/show_bug.cgi?id=17801
     @safe unittest
     {
         import std.conv : to;
@@ -3325,7 +3325,7 @@ public:
         assert(DateTime.fromISOExtString(" 1999-07-06T12:30:33 ") == DateTime(Date(1999, 7, 6), TimeOfDay(12, 30, 33)));
     }
 
-    // bug# 17801
+    // https://issues.dlang.org/show_bug.cgi?id=17801
     @safe unittest
     {
         import std.conv : to;
@@ -3429,7 +3429,7 @@ public:
                DateTime(Date(1999, 7, 6), TimeOfDay(12, 30, 33)));
     }
 
-    // bug# 17801
+    // https://issues.dlang.org/show_bug.cgi?id=17801
     @safe unittest
     {
         import std.conv : to;
@@ -7733,7 +7733,7 @@ public:
         assert(Date.fromISOString(" 19990706 ") == Date(1999, 7, 6));
     }
 
-    // bug# 17801
+    // https://issues.dlang.org/show_bug.cgi?id=17801
     @safe unittest
     {
         import std.conv : to;
@@ -7871,7 +7871,7 @@ public:
         assert(Date.fromISOExtString(" 1999-07-06 ") == Date(1999, 7, 6));
     }
 
-    // bug# 17801
+    // https://issues.dlang.org/show_bug.cgi?id=17801
     @safe unittest
     {
         import std.conv : to;
@@ -8009,7 +8009,7 @@ public:
         assert(Date.fromSimpleString(" 1999-Jul-06 ") == Date(1999, 7, 6));
     }
 
-    // bug# 17801
+    // https://issues.dlang.org/show_bug.cgi?id=17801
     @safe unittest
     {
         import std.conv : to;
@@ -9295,7 +9295,7 @@ public:
         assert(TimeOfDay.fromISOString(" 011217 ") == TimeOfDay(1, 12, 17));
     }
 
-    // bug# 17801
+    // https://issues.dlang.org/show_bug.cgi?id=17801
     @safe unittest
     {
         import std.conv : to;
@@ -9420,7 +9420,7 @@ public:
         assert(TimeOfDay.fromISOExtString(" 01:12:17 ") == TimeOfDay(1, 12, 17));
     }
 
-    // bug# 17801
+    // https://issues.dlang.org/show_bug.cgi?id=17801
     @safe unittest
     {
         import std.conv : to;
diff --git a/std/datetime/interval.d b/std/datetime/interval.d
index d727e6691f7..6226f76a00d 100644
--- a/std/datetime/interval.d
+++ b/std/datetime/interval.d
@@ -4133,9 +4133,9 @@ assert(!range.empty);
     /+
         Converts this interval to a string.
       +/
-    //Due to bug http://d.puremagic.com/issues/show_bug.cgi?id=3715 , we can't
-    //have versions of toString() with extra modifiers, so we define one version
-    //with modifiers and one without.
+    // Due to bug https://issues.dlang.org/show_bug.cgi?id=3715 , we can't
+    // have versions of toString() with extra modifiers,
+    // so we define one version with modifiers and one without.
     string toString()
     {
         return _toStringImpl();
@@ -4145,9 +4145,9 @@ assert(!range.empty);
     /++
         Converts this interval to a string.
       +/
-    //Due to bug http://d.puremagic.com/issues/show_bug.cgi?id=3715 , we can't
-    //have versions of toString() with extra modifiers, so we define one version
-    //with modifiers and one without.
+    // Due to bug https://issues.dlang.org/show_bug.cgi?id=3715 , we can't
+    // have versions of toString() with extra modifiers,
+    // so we define one version with modifiers and one without.
     string toString() const nothrow
     {
         return _toStringImpl();
@@ -6357,9 +6357,9 @@ assert(!range.empty);
     /+
         Converts this interval to a string.
       +/
-    //Due to bug http://d.puremagic.com/issues/show_bug.cgi?id=3715 , we can't
-    //have versions of toString() with extra modifiers, so we define one version
-    //with modifiers and one without.
+    // Due to bug https://issues.dlang.org/show_bug.cgi?id=3715 , we can't
+    // have versions of toString() with extra modifiers,
+    // so we define one version with modifiers and one without.
     string toString()
     {
         return _toStringImpl();
@@ -6369,9 +6369,9 @@ assert(!range.empty);
     /++
         Converts this interval to a string.
       +/
-    //Due to bug http://d.puremagic.com/issues/show_bug.cgi?id=3715 , we can't
-    //have versions of toString() with extra modifiers, so we define one version
-    //with modifiers and one without.
+    // Due to bug https://issues.dlang.org/show_bug.cgi?id=3715 , we can't
+    // have versions of toString() with extra modifiers,
+    // so we define one version with modifiers and one without.
     string toString() const nothrow
     {
         return _toStringImpl();
@@ -8307,8 +8307,8 @@ private:
     static assert(isInputRange!(IntervalRange!(Date, Direction.fwd)));
     static assert(isForwardRange!(IntervalRange!(Date, Direction.fwd)));
 
-    //Commented out due to bug http://d.puremagic.com/issues/show_bug.cgi?id=4895
-    //static assert(!isOutputRange!(IntervalRange!(Date, Direction.fwd), Date));
+    // Commented out due to bug https://issues.dlang.org/show_bug.cgi?id=4895
+    // static assert(!isOutputRange!(IntervalRange!(Date, Direction.fwd), Date));
 
     static assert(!isBidirectionalRange!(IntervalRange!(Date, Direction.fwd)));
     static assert(!isRandomAccessRange!(IntervalRange!(Date, Direction.fwd)));
@@ -8754,8 +8754,8 @@ private:
     static assert(isForwardRange!(PosInfIntervalRange!Date));
     static assert(isInfinite!(PosInfIntervalRange!Date));
 
-    //Commented out due to bug http://d.puremagic.com/issues/show_bug.cgi?id=4895
-    //static assert(!isOutputRange!(PosInfIntervalRange!Date, Date));
+    // Commented out due to bug https://issues.dlang.org/show_bug.cgi?id=4895
+    // static assert(!isOutputRange!(PosInfIntervalRange!Date, Date));
     static assert(!isBidirectionalRange!(PosInfIntervalRange!Date));
     static assert(!isRandomAccessRange!(PosInfIntervalRange!Date));
     static assert(!hasSwappableElements!(PosInfIntervalRange!Date));
@@ -9037,8 +9037,8 @@ private:
     static assert(isForwardRange!(NegInfIntervalRange!Date));
     static assert(isInfinite!(NegInfIntervalRange!Date));
 
-    //Commented out due to bug http://d.puremagic.com/issues/show_bug.cgi?id=4895
-    //static assert(!isOutputRange!(NegInfIntervalRange!Date, Date));
+    // Commented out due to bug https://issues.dlang.org/show_bug.cgi?id=4895
+    // static assert(!isOutputRange!(NegInfIntervalRange!Date, Date));
     static assert(!isBidirectionalRange!(NegInfIntervalRange!Date));
     static assert(!isRandomAccessRange!(NegInfIntervalRange!Date));
     static assert(!hasSwappableElements!(NegInfIntervalRange!Date));
diff --git a/std/datetime/package.d b/std/datetime/package.d
index b975dcd5780..cdbf9589ee0 100644
--- a/std/datetime/package.d
+++ b/std/datetime/package.d
@@ -157,7 +157,7 @@ import std.typecons : Flag, Yes, No;
 @safe unittest
 {
     import std.traits : hasUnsharedAliasing;
-    /* Issue 6642 */
+    /* https://issues.dlang.org/show_bug.cgi?id=6642 */
     static assert(!hasUnsharedAliasing!Date);
     static assert(!hasUnsharedAliasing!TimeOfDay);
     static assert(!hasUnsharedAliasing!DateTime);
@@ -598,7 +598,7 @@ deprecated @safe unittest
     //writeln(b1.point);
 }
 
-//Bug# 8450
+// Bug# https://issues.dlang.org/show_bug.cgi?id=8450
 deprecated @system unittest
 {
     @safe    void safeFunc() {}
@@ -734,7 +734,7 @@ deprecated @safe unittest
     +/
 }
 
-//Bug# 8450
+// https://issues.dlang.org/show_bug.cgi?id=8450
 deprecated @system unittest
 {
     @safe    void safeFunc() {}
diff --git a/std/datetime/systime.d b/std/datetime/systime.d
index 977cec30584..1954402e8e1 100644
--- a/std/datetime/systime.d
+++ b/std/datetime/systime.d
@@ -8074,7 +8074,7 @@ public:
     }
 
 
-    // Temporary hack until bug http://d.puremagic.com/issues/show_bug.cgi?id=4867 is fixed.
+    // Temporary hack until bug https://issues.dlang.org/show_bug.cgi?id=4867 is fixed.
     // This allows assignment from const(SysTime) to SysTime.
     // It may be a good idea to keep it though, since casting from a type to itself
     // should be allowed, and it doesn't work without this opCast() since opCast()
@@ -8923,11 +8923,11 @@ public:
         // pops up when deprecations are moved along around July 2019. At that
         // time, we will update fromISOString so that it is conformant with ISO
         // 8601, and it will no longer accept ISO extended time zones (it does
-        // currently because of issue #15654 - toISOString used to incorrectly
-        // use the ISO extended time zone format). These tests will then start
-        // failing will need to be updated accordingly. Also, the notes about
-        // this issue in toISOString and fromISOString's documentation will need
-        // to be removed.
+        // currently because of https://issues.dlang.org/show_bug.cgi?id=15654
+        // toISOString used to incorrectly use the ISO extended time zone format).
+        // These tests will then start failing will need to be updated accordingly.
+        // Also, the notes about this issue in toISOString and fromISOString's
+        // documentation will need to be removed.
         test("20101222T172201-01:00", SysTime(DateTime(2010, 12, 22, 17, 22, 01), west60));
         test("20101222T172201-01:30", SysTime(DateTime(2010, 12, 22, 17, 22, 01), west90));
         test("20101222T172201-08:00", SysTime(DateTime(2010, 12, 22, 17, 22, 01), west480));
@@ -8948,7 +8948,7 @@ public:
         }
     }
 
-    // bug# 17801
+    // https://issues.dlang.org/show_bug.cgi?id=17801
     @safe unittest
     {
         import std.conv : to;
@@ -9195,7 +9195,7 @@ public:
         }
     }
 
-    // bug# 17801
+    // https://issues.dlang.org/show_bug.cgi?id=17801
     @safe unittest
     {
         import core.time;
@@ -9446,7 +9446,7 @@ public:
         }
     }
 
-    // bug# 17801
+    // https://issues.dlang.org/show_bug.cgi?id=17801
     @safe unittest
     {
         import core.time;
@@ -10513,7 +10513,8 @@ version (StdUnittest) private void testBadParse822(alias cr)(string str, size_t
                            function(string a){return cast(ubyte[]) a;},
                            function(string a){return a;},
                            function(string a){return map!(b => cast(char) b)(a.representation);}))
-    {(){ // workaround slow optimizations for large functions @@@BUG@@@ 2396
+    {(){ // workaround slow optimizations for large functions
+         // https://issues.dlang.org/show_bug.cgi?id=2396
         scope(failure) writeln(typeof(cr).stringof);
         alias test = testParse822!cr;
         alias testBad = testBadParse822!cr;
@@ -10784,7 +10785,8 @@ version (StdUnittest) private void testBadParse822(alias cr)(string str, size_t
                            function(string a){return cast(ubyte[]) a;},
                            function(string a){return a;},
                            function(string a){return map!(b => cast(char) b)(a.representation);}))
-    {(){ // workaround slow optimizations for large functions @@@BUG@@@ 2396
+    {(){ // workaround slow optimizations for large functions
+         // https://issues.dlang.org/show_bug.cgi?id=2396
         scope(failure) writeln(typeof(cr).stringof);
         alias test = testParse822!cr;
         {
diff --git a/std/datetime/timezone.d b/std/datetime/timezone.d
index 33097dacea7..2144e092f32 100644
--- a/std/datetime/timezone.d
+++ b/std/datetime/timezone.d
@@ -450,7 +450,7 @@ public:
             bool first = true;
             auto springSwitch = SysTime(dstSwitches[i][0] + dur!"hours"(spring), UTC()) - stdOffset;
             auto fallSwitch = SysTime(dstSwitches[i][1] + dur!"hours"(fall), UTC()) - dstOffset;
-            // @@@BUG@@@ 3659 makes this necessary.
+            // https://issues.dlang.org/show_bug.cgi?id=3659 makes this necessary.
             auto fallSwitchMinus1 = fallSwitch - dur!"hours"(1);
 
             foreach (hour; -24 .. 25)
@@ -596,7 +596,7 @@ public:
             GetTimeZoneInformation(&tzInfo);
 
             // Cannot use to!string() like this should, probably due to bug
-            // http://d.puremagic.com/issues/show_bug.cgi?id=5016
+            // https://issues.dlang.org/show_bug.cgi?id=5016
             //return to!string(tzInfo.StandardName);
 
             wchar[32] str;
@@ -681,7 +681,7 @@ public:
             GetTimeZoneInformation(&tzInfo);
 
             // Cannot use to!string() like this should, probably due to bug
-            // http://d.puremagic.com/issues/show_bug.cgi?id=5016
+            // https://issues.dlang.org/show_bug.cgi?id=5016
             //return to!string(tzInfo.DaylightName);
 
             wchar[32] str;
@@ -1039,7 +1039,7 @@ public:
                 bool first = true;
                 auto springSwitch = SysTime(tzInfos[i][1] + dur!"hours"(spring), UTC()) - stdOffset;
                 auto fallSwitch = SysTime(tzInfos[i][2] + dur!"hours"(fall), UTC()) - dstOffset;
-                // @@@BUG@@@ 3659 makes this necessary.
+                // https://issues.dlang.org/show_bug.cgi?id=3659 makes this necessary.
                 auto fallSwitchMinus1 = fallSwitch - dur!"hours"(1);
 
                 foreach (hour; -24 .. 25)
diff --git a/std/digest/package.d b/std/digest/package.d
index 2de76308075..e98c471ff0c 100644
--- a/std/digest/package.d
+++ b/std/digest/package.d
@@ -606,7 +606,7 @@ interface Digest
         @trusted nothrow ubyte[] finish();
         ///ditto
         nothrow ubyte[] finish(ubyte[] buf);
-        //@@@BUG@@@ http://d.puremagic.com/issues/show_bug.cgi?id=6549
+        // https://issues.dlang.org/show_bug.cgi?id=6549
         /*in
         {
             assert(buf.length >= this.length);
diff --git a/std/digest/sha.d b/std/digest/sha.d
index 47503be39dc..0aebb62fc7b 100644
--- a/std/digest/sha.d
+++ b/std/digest/sha.d
@@ -103,7 +103,7 @@ module std.digest.sha;
 
 version (D_InlineAsm_X86)
 {
-    version (D_PIC) {} // Bugzilla 9378
+    version (D_PIC) {} // https://issues.dlang.org/show_bug.cgi?id=9378
     else private version = USE_SSSE3;
 }
 else version (D_InlineAsm_X86_64)
@@ -209,7 +209,8 @@ struct SHA(uint hashBlockSize, uint digestSize)
                 if (ssse3)
                 {
                     version (D_InlineAsm_X86_64)
-                        // constants as extra argument for PIC, see Bugzilla 9378
+                        // constants as extra argument for PIC
+                        // see https://issues.dlang.org/show_bug.cgi?id=9378
                         transformSSSE3(state, block, &sse3_constants);
                     else
                         transformSSSE3(state, block);
diff --git a/std/exception.d b/std/exception.d
index eec3c9055f8..7931bc48ef3 100644
--- a/std/exception.d
+++ b/std/exception.d
@@ -526,9 +526,9 @@ private void bailOut(E : Throwable = Exception)(string file, size_t line, scope
     }
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=10510
 @safe unittest
 {
-    // Issue 10510
     extern(C) void cFoo() { }
     enforce(false, &cFoo);
 }
@@ -566,7 +566,7 @@ private void bailOut(E : Throwable = Exception)(string file, size_t line, scope
     }
 }
 
-// Test for bugzilla 8637
+// Test for https://issues.dlang.org/show_bug.cgi?id=8637
 @system unittest
 {
     struct S
@@ -600,10 +600,9 @@ private void bailOut(E : Throwable = Exception)(string file, size_t line, scope
     enforce!E2(s);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=14685
 @safe unittest
 {
-    // Issue 14685
-
     class E : Exception
     {
         this() { super("Not found"); }
@@ -1249,7 +1248,9 @@ bool mayPointTo(S, T)(auto ref const shared S source, ref const shared T target)
 @system unittest
 {
     int i;
-    int* p = &i; // trick the compiler when initializing slicep; https://issues.dlang.org/show_bug.cgi?id=18637
+     // trick the compiler when initializing slice
+     // https://issues.dlang.org/show_bug.cgi?id=18637
+    int* p = &i;
     int[]  slice = [0, 1, 2, 3, 4];
     int[5] arr   = [0, 1, 2, 3, 4];
     int*[]  slicep = [p];
@@ -1315,8 +1316,9 @@ bool mayPointTo(S, T)(auto ref const shared S source, ref const shared T target)
 
 version (StdUnittest)
 {
-    // 17084 : the bug doesn't happen if these declarations are
-    // in the unittest block (static or not).
+    // https://issues.dlang.org/show_bug.cgi?id=17084
+    // the bug doesn't happen if these declarations are in the unittest block
+    // (static or not).
     private struct Page17084
     {
         URL17084 url;
@@ -1332,7 +1334,8 @@ version (StdUnittest)
     }
 }
 
-@system unittest // Bugzilla 17084
+// https://issues.dlang.org/show_bug.cgi?id=17084
+@system unittest
 {
     import std.algorithm.sorting : sort;
     Page17084[] s;
diff --git a/std/experimental/allocator/building_blocks/free_tree.d b/std/experimental/allocator/building_blocks/free_tree.d
index 4115a835e7f..bd4bb9511ea 100644
--- a/std/experimental/allocator/building_blocks/free_tree.d
+++ b/std/experimental/allocator/building_blocks/free_tree.d
@@ -418,7 +418,8 @@ version (StdUnittest)
     testAllocator!(() => FreeTree!GCAllocator());
 }
 
-@system unittest // issue 16506
+// https://issues.dlang.org/show_bug.cgi?id=16506
+@system unittest
 {
     import std.experimental.allocator.gc_allocator : GCAllocator;
     import std.experimental.allocator.mallocator : Mallocator;
@@ -437,7 +438,8 @@ version (StdUnittest)
     f!GCAllocator(1);
 }
 
-@system unittest // issue 16507
+// https://issues.dlang.org/show_bug.cgi?id=16507
+@system unittest
 {
     static struct MyAllocator
     {
diff --git a/std/experimental/allocator/mallocator.d b/std/experimental/allocator/mallocator.d
index bc463a7af16..bd813a51f76 100644
--- a/std/experimental/allocator/mallocator.d
+++ b/std/experimental/allocator/mallocator.d
@@ -374,7 +374,8 @@ version (LDC_AddressSanitizer)
 version (Posix)
 @nogc @system nothrow unittest
 {
-    // 16398 : test the "pseudo" alignedReallocate for Posix
+    // https://issues.dlang.org/show_bug.cgi?id=16398
+    // test the "pseudo" alignedReallocate for Posix
     void[] s = AlignedMallocator.instance.alignedAllocate(16, 32);
     (cast(ubyte[]) s)[] = ubyte(1);
     AlignedMallocator.instance.alignedReallocate(s, 32, 32);
diff --git a/std/experimental/allocator/package.d b/std/experimental/allocator/package.d
index 92073ccb777..7503614c744 100644
--- a/std/experimental/allocator/package.d
+++ b/std/experimental/allocator/package.d
@@ -226,8 +226,9 @@ module std.experimental.allocator;
 public import std.experimental.allocator.common,
     std.experimental.allocator.typed;
 
-// Fix issue 17806: this should always be the first unittest in this module
-// in order to ensure that we use the `processAllocator` setter before the getter
+// Fix https://issues.dlang.org/show_bug.cgi?id=17806
+// this should always be the first unittest in this module in order to ensure
+// that we use the `processAllocator` setter before the getter
 @system unittest
 {
     import std.experimental.allocator.mallocator : Mallocator;
@@ -1246,7 +1247,9 @@ auto make(T, Allocator, A...)(auto ref Allocator alloc, auto ref A args)
     assert(outer.x == inner.getX);
 }
 
-@system unittest // bugzilla 15639 & 15772
+// https://issues.dlang.org/show_bug.cgi?id=15639
+// https://issues.dlang.org/show_bug.cgi?id=15772
+@system unittest
 {
     abstract class Foo {}
     class Bar: Foo {}
@@ -1410,7 +1413,8 @@ nothrow @safe @nogc unittest
         "Don't allow zero-ctor-args `make` for structs with `@disable this();`");
 }
 
-@safe unittest // issue 18937
+// https://issues.dlang.org/show_bug.cgi?id=18937
+@safe unittest
 {
     static struct S
     {
@@ -2455,7 +2459,8 @@ void dispose(A, T)(auto ref A alloc, auto ref T[] array)
     theAllocator.dispose(arr);
 }
 
-@system unittest //bugzilla 16512
+// https://issues.dlang.org/show_bug.cgi?id=16512
+@system unittest
 {
     import std.experimental.allocator.mallocator : Mallocator;
 
@@ -2476,7 +2481,8 @@ void dispose(A, T)(auto ref A alloc, auto ref T[] array)
     assert(ua is null);
 }
 
-@system unittest //bugzilla 15721
+// https://issues.dlang.org/show_bug.cgi?id=15721
+@system unittest
 {
     import std.experimental.allocator.mallocator : Mallocator;
 
diff --git a/std/experimental/logger/core.d b/std/experimental/logger/core.d
index 0f5a9dbb512..dc537048fe9 100644
--- a/std/experimental/logger/core.d
+++ b/std/experimental/logger/core.d
@@ -3071,7 +3071,7 @@ private void trustedStore(T)(ref shared T dst, ref T src) @trusted
     stdThreadLocalLog.logLevel = LogLevel.all;
 }
 
-// Issue 14940
+// https://issues.dlang.org/show_bug.cgi?id=14940
 @safe unittest
 {
     import std.typecons : Nullable;
@@ -3101,7 +3101,7 @@ private void trustedStore(T)(ref shared T dst, ref T src) @trusted
     assert(tl.msg == SystemToStringMsg);
 }
 
-// Issue 17328
+// https://issues.dlang.org/show_bug.cgi?id=17328
 @safe unittest
 {
     import std.format : format;
@@ -3123,7 +3123,7 @@ private void trustedStore(T)(ref shared T dst, ref T src) @trusted
     assert(fs.length == 2);
 }
 
-// Issue 15954
+// https://issues.dlang.org/show_bug.cgi?id=15954
 @safe unittest
 {
     import std.conv : to;
@@ -3132,7 +3132,7 @@ private void trustedStore(T)(ref shared T dst, ref T src) @trusted
     assert(tl.msg == "123456789");
 }
 
-// Issue 16256
+// https://issues.dlang.org/show_bug.cgi?id=16256
 @safe unittest
 {
     import std.conv : to;
@@ -3141,7 +3141,7 @@ private void trustedStore(T)(ref shared T dst, ref T src) @trusted
     assert(tl.msg == "123456789");
 }
 
-// Issue 15517
+// https://issues.dlang.org/show_bug.cgi?id=15517
 @system unittest
 {
     import std.file : exists, remove, tempDir;
diff --git a/std/experimental/typecons.d b/std/experimental/typecons.d
index 7f5d0da3f59..cbe682b13b0 100644
--- a/std/experimental/typecons.d
+++ b/std/experimental/typecons.d
@@ -663,9 +663,10 @@ template unwrap(Target)
         assert(d.draw(10) == 10);
     }
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=10377
 @system unittest
 {
-    // Bugzilla 10377
     import std.algorithm, std.range;
 
     interface MyInputRange(T)
@@ -680,9 +681,10 @@ template unwrap(Target)
     auto r = iota(0,10,1).inputRangeObject().wrap!(MyInputRange!int)();
     assert(equal(r, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]));
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=10536
 @system unittest
 {
-    // Bugzilla 10536
     interface Interface
     {
         int foo();
@@ -696,9 +698,10 @@ template unwrap(Target)
     Interface i = new Pluggable().wrap!Interface;
     assert(i.foo() == 1);
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=10538
 @system unittest
 {
-    // Enhancement 10538
     interface Interface
     {
         int foo();
@@ -1049,7 +1052,7 @@ pure nothrow @safe unittest
     assert((arr ~ 4) == [1, 2, 3, 4]);
 }
 
-// issue 17270
+// https://issues.dlang.org/show_bug.cgi?id=17270
 pure nothrow @nogc @system unittest
 {
     int i = 1;
diff --git a/std/file.d b/std/file.d
index d973d71236c..28dbaad3eac 100644
--- a/std/file.d
+++ b/std/file.d
@@ -283,9 +283,9 @@ private T cenforce(T)(T condition, scope const(char)[] name, scope const(FSChar)
     throw new FileException(name, .errno, file, line);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=17102
 @safe unittest
 {
-    // issue 17102
     try
     {
         cenforce(false, null, null,
@@ -1985,7 +1985,8 @@ private bool existsImpl(const(FSChar)* namez) @trusted nothrow @nogc
     assert(deleteme.exists);
 }
 
-@safe unittest // Bugzilla 16573
+// https://issues.dlang.org/show_bug.cgi?id=16573
+@safe unittest
 {
     enum S : string { foo = "foo" }
     assert(__traits(compiles, S.foo.exists));
@@ -2551,7 +2552,8 @@ if (isConvertibleToString!R)
     assert(f.isFile);
 }
 
-@system unittest // bugzilla 15658
+// https://issues.dlang.org/show_bug.cgi?id=15658
+@system unittest
 {
     DirEntry e = DirEntry(".");
     static assert(is(typeof(isFile(e))));
@@ -3117,7 +3119,7 @@ void mkdirRecurse(scope const(char)[] pathname) @safe
         assertThrown!FileException(mkdirRecurse(`1:\foobar`));
     }
 
-    // bug3570
+    // https://issues.dlang.org/show_bug.cgi?id=3570
     {
         immutable basepath = deleteme ~ "_dir";
         version (Windows)
@@ -4118,7 +4120,7 @@ else version (Posix)
             core.sys.posix.unistd.symlink((deleteme ~ "_broken_symlink\0").ptr, symfile.ptr);
 
             {
-                //Issue 8298
+                // https://issues.dlang.org/show_bug.cgi?id=8298
                 DirEntry de = DirEntry(symfile);
 
                 assert(!de.isFile);
@@ -4225,7 +4227,8 @@ if (isConvertibleToString!RF || isConvertibleToString!RT)
     assert(targetNonExistent.readText == "source");
 }
 
-@safe unittest // issue 15319
+// https://issues.dlang.org/show_bug.cgi?id=15319
+@safe unittest
 {
     assert(__traits(compiles, copy("from.txt", "to.txt")));
 }
@@ -4325,9 +4328,10 @@ private void copyImpl(scope const(char)[] f, scope const(char)[] t,
     }
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=14817
 @safe unittest
 {
-    import std.algorithm, std.file; // issue 14817
+    import std.algorithm, std.file;
     auto t1 = deleteme, t2 = deleteme~"2";
     scope(exit) foreach (t; [t1, t2]) if (t.exists) t.remove();
     write(t1, "11");
@@ -4342,7 +4346,8 @@ private void copyImpl(scope const(char)[] f, scope const(char)[] t,
     assert(readText(t2.byChar) == "2");
 }
 
-@safe version (Posix) @safe unittest //issue 11434
+// https://issues.dlang.org/show_bug.cgi?id=11434
+@safe version (Posix) @safe unittest
 {
     import std.conv : octal;
     auto t1 = deleteme, t2 = deleteme~"2";
@@ -4354,7 +4359,8 @@ private void copyImpl(scope const(char)[] f, scope const(char)[] t,
     assert(getAttributes(t2) == octal!100767);
 }
 
-@safe unittest // issue 15865
+// https://issues.dlang.org/show_bug.cgi?id=15865
+@safe unittest
 {
     import std.exception : assertThrown;
     auto t = deleteme;
@@ -4364,7 +4370,7 @@ private void copyImpl(scope const(char)[] f, scope const(char)[] t,
     assert(readText(t) == "a");
 }
 
-// issue 19834
+// https://issues.dlang.org/show_bug.cgi?id=19834
 version (Windows) @safe unittest
 {
     import std.exception : collectException;
@@ -4974,7 +4980,7 @@ auto dirEntries(string path, SpanMode mode, bool followSymlink = true)
         assert(e.isFile || e.isDir, e.name);
     }
 
-    //issue 7264
+    // https://issues.dlang.org/show_bug.cgi?id=7264
     foreach (string name; dirEntries(testdir, "*.d", SpanMode.breadth))
     {
 
@@ -4983,14 +4989,14 @@ auto dirEntries(string path, SpanMode mode, bool followSymlink = true)
     {
         static assert(is(typeof(entry) == DirEntry));
     }
-    //issue 7138
+    // https://issues.dlang.org/show_bug.cgi?id=7138
     auto a = array(dirEntries(testdir, SpanMode.shallow));
 
-    // issue 11392
+    // https://issues.dlang.org/show_bug.cgi?id=11392
     auto dFiles = dirEntries(testdir, SpanMode.shallow);
     foreach (d; dFiles){}
 
-    // issue 15146
+    // https://issues.dlang.org/show_bug.cgi?id=15146
     dirEntries("", SpanMode.shallow).walkLength();
 }
 
@@ -5081,7 +5087,8 @@ auto dirEntries(string path, string pattern, SpanMode mode,
     }
 }
 
-// Bugzilla 17962 - Make sure that dirEntries does not butcher Unicode file names.
+// Make sure that dirEntries does not butcher Unicode file names
+// https://issues.dlang.org/show_bug.cgi?id=17962
 @system unittest
 {
     import std.algorithm.comparison : equal;
diff --git a/std/format.d b/std/format.d
index 98ca3b5ad38..b146a8e01cd 100644
--- a/std/format.d
+++ b/std/format.d
@@ -1659,7 +1659,7 @@ if (is(Unqual!Char == Char))
     assert(w.data == "ab%cd%ef" && f.trailing == "g%%h%sij", w.data);
     f.writeUpToNextSpec(w);
     assert(w.data == "ab%cd%efg%h" && f.trailing == "ij");
-    // bug4775
+    // https://issues.dlang.org/show_bug.cgi?id=4775
     f = FormatSpec!char("%%%s");
     w.clear();
     f.writeUpToNextSpec(w);
@@ -1675,9 +1675,9 @@ if (is(Unqual!Char == Char))
     assert(w.data == "a%b%c" && f.trailing == "%");
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=5237
 @safe unittest
 {
-    // issue 5237
     import std.array;
     auto w = appender!string();
     auto f = FormatSpec!char("%.16f");
@@ -1713,7 +1713,7 @@ if (is(Unqual!Char == Char))
     assert(a.data == "Number: \nString: ");
 }
 
-// Issue 14059
+// https://issues.dlang.org/show_bug.cgi?id=14059
 @safe unittest
 {
     import std.array : appender;
@@ -2455,7 +2455,8 @@ private void formatUnsigned(Writer, T, Char)
         put(w, ' ');
 }
 
-@safe pure unittest  // bugzilla 18838
+// https://issues.dlang.org/show_bug.cgi?id=18838
+@safe pure unittest
 {
     assert("%12,d".format(0) == "           0");
 }
@@ -2486,7 +2487,7 @@ private void formatUnsigned(Writer, T, Char)
     formatTest( S2(10), "S" );
 }
 
-// bugzilla 9117
+// https://issues.dlang.org/show_bug.cgi?id=9117
 @safe unittest
 {
     static struct Frop {}
@@ -2535,7 +2536,7 @@ private void formatUnsigned(Writer, T, Char)
     assert(result == "9");
 }
 
-// bugzilla 20064
+// https://issues.dlang.org/show_bug.cgi?id=20064
 @safe unittest
 {
     assert(format( "%03,d",  1234) ==              "1,234");
@@ -2866,7 +2867,7 @@ useSnprintf:
     formatTest( S2(2.25), "S" );
 }
 
-// bugzilla 19939
+// https://issues.dlang.org/show_bug.cgi?id=19939
 @safe unittest
 {
     assert(format("^%13,3.2f$",          1.00) == "^         1.00$");
@@ -2879,7 +2880,7 @@ useSnprintf:
     assert(format("^%13,3.2f$", 10_000_000.00) == "^10,000,000.00$");
 }
 
-// bugzilla 20069
+// https://issues.dlang.org/show_bug.cgi?id=20069
 @safe unittest
 {
     assert(format("%012,f",   -1234.0) ==    "-1,234.000000");
@@ -2919,7 +2920,7 @@ useSnprintf:
     assert(t2 == "[ -12.3] [-12.3 ]");
 }
 
-// issue 20396
+// https://issues.dlang.org/show_bug.cgi?id=20396
 @safe unittest
 {
     import std.math : nextUp;
@@ -2928,7 +2929,7 @@ useSnprintf:
     assert(format!"%a"(nextUp(0.0)) == "0x0.0000000000001p-1022");
 }
 
-// issue 20371
+// https://issues.dlang.org/show_bug.cgi?id=20371
 @safe unittest
 {
     assert(format!"%.1000a"(1.0) ==
@@ -3192,7 +3193,8 @@ if (is(StaticArrayTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
     formatValueImpl(w, obj[], f);
 }
 
-@safe unittest    // Test for issue 8310
+// Test for https://issues.dlang.org/show_bug.cgi?id=8310
+@safe unittest
 {
     import std.array : appender;
     FormatSpec!char f;
@@ -3311,9 +3313,9 @@ if (is(DynamicArrayTypeOf!T) && !is(StringTypeOf!T) && !is(T == enum) && !hasToS
     formatTest( s, "[1, 2, 3]" );
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=6640
 @safe unittest
 {
-    // 6640
     struct Range
     {
       @safe:
@@ -3587,7 +3589,8 @@ if (isInputRange!T)
         throw new FormatException(text("Incorrect format specifier for range: %", f.spec));
 }
 
-@safe pure unittest // Issue 18778
+// https://issues.dlang.org/show_bug.cgi?id=18778
+@safe pure unittest
 {
     assert(format("%-(%1$s - %1$s, %)", ["A", "B", "C"]) == "A - A, B - B, C - C");
 }
@@ -3642,7 +3645,7 @@ if (is(StringTypeOf!T) && !is(T == enum))
     import std.array : appender;
     import std.utf : decode, UTFException;
 
-    StringTypeOf!T str = val;   // bug 8015
+    StringTypeOf!T str = val;   // https://issues.dlang.org/show_bug.cgi?id=8015
 
     if (f.spec == 's')
     {
@@ -3830,7 +3833,7 @@ if (is(AssocArrayTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
     formatTest( "{%([%04d->%(%c.%)]%| $ %)}", aa3,
                [`{[0001->h.e.l.l.o] $ [0002->w.o.r.l.d]}`, `{[0002->w.o.r.l.d] $ [0001->h.e.l.l.o]}`] );
 
-    // issue 12135
+    // https://issues.dlang.org/show_bug.cgi?id=12135
     formatTest("%(%s:<%s>%|,%)", [1:2], "1:<2>");
     formatTest("%(%s:<%s>%|%)" , [1:2], "1:<2>");
 }
@@ -3850,7 +3853,8 @@ if (is(AssocArrayTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
     formatTest( S2(['c':1, 'd':2]), "S" );
 }
 
-@safe unittest  // Issue 8921
+// https://issues.dlang.org/show_bug.cgi?id=8921
+@safe unittest
 {
     enum E : char { A = 'a', B = 'b', C = 'c' }
     E[3] e = [E.A, E.B, E.C];
@@ -4135,7 +4139,8 @@ if (is(T == class) && !is(T == enum))
         with(HasToStringResult)
         static if ((is(T == immutable) || is(T == const) || is(T == shared)) && overload == none)
         {
-            // issue 7879, remove this when Object gets const toString
+            // Remove this when Object gets const toString
+            // https://issues.dlang.org/show_bug.cgi?id=7879
             static if (is(T == immutable))
                 put(w, "immutable(");
             else static if (is(T == const))
@@ -4182,7 +4187,7 @@ if (is(T == class) && !is(T == enum))
 {
     import std.array : appender;
     import std.range.interfaces;
-    // class range (issue 5154)
+    // class range (https://issues.dlang.org/show_bug.cgi?id=5154)
     auto c = inputRangeObject([1,2,3,4]);
     formatTest( c, "[1, 2, 3, 4]" );
     assert(c.empty);
@@ -4192,7 +4197,7 @@ if (is(T == class) && !is(T == enum))
 
 @system unittest
 {
-    // 5354
+    // https://issues.dlang.org/show_bug.cgi?id=5354
     // If the class has both range I/F and custom toString, the use of custom
     // toString routine is prioritized.
 
@@ -4251,7 +4256,7 @@ version (StdUnittest)
     private class C {}
 }
 
-// issue 7879
+// https://issues.dlang.org/show_bug.cgi?id=7879
 @safe unittest
 {
     const(C) c;
@@ -4388,7 +4393,7 @@ if (is(T == interface) && (hasToString!(T, Char) || !is(BuiltinTypeOf!T)) && !is
     Whatever val = new C;
     formatTest( val, "ab" );
 
-    // Issue 11175
+    // https://issues.dlang.org/show_bug.cgi?id=11175
     version (Windows)
     {
         import core.sys.windows.com : IUnknown, IID;
@@ -4463,16 +4468,16 @@ if ((is(T == struct) || is(T == union)) && (hasToString!(T, Char) || !is(Builtin
     }
 }
 
-// issue 9588
+// https://issues.dlang.org/show_bug.cgi?id=9588
 @safe pure unittest
 {
     struct S { int x; bool empty() { return false; } }
     formatTest( S(), "S(0)" );
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=4638
 @safe unittest
 {
-    // bug 4638
     struct U8  {  string toString() const { return "blah"; } }
     struct U16 { wstring toString() const { return "blah"; } }
     struct U32 { dstring toString() const { return "blah"; } }
@@ -4481,9 +4486,9 @@ if ((is(T == struct) || is(T == union)) && (hasToString!(T, Char) || !is(Builtin
     formatTest( U32(), "blah" );
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=3890
 @safe unittest
 {
-    // 3890
     struct Int{ int n; }
     struct Pair{ string s; Int i; }
     formatTest( Pair("hello", Int(5)),
@@ -4516,7 +4521,7 @@ if ((is(T == struct) || is(T == union)) && (hasToString!(T, Char) || !is(Builtin
 @system unittest
 {
     import std.array;
-    // 7230
+    // https://issues.dlang.org/show_bug.cgi?id=7230
     static struct Bug7230
     {
         string s = "hello";
@@ -4699,7 +4704,7 @@ if (isSIMDVector!V)
     {
         version (X86)
         {
-            version (OSX) {/* issue 17823 */}
+            version (OSX) {/* https://issues.dlang.org/show_bug.cgi?id=17823 */}
         }
         else
         {
@@ -4722,7 +4727,7 @@ if (isSIMDVector!V)
     formatTest( q, "FFEECCAA" );
 }
 
-// issue 11782
+// https://issues.dlang.org/show_bug.cgi?id=11782
 @safe pure unittest
 {
     import std.range : iota;
@@ -4736,7 +4741,7 @@ if (isSIMDVector!V)
 
 @system pure unittest
 {
-    // Test for issue 7869
+    // Test for https://issues.dlang.org/show_bug.cgi?id=7869
     struct S
     {
         string toString() const { return ""; }
@@ -4748,9 +4753,9 @@ if (isSIMDVector!V)
     formatTest( q, "FFEECCAA" );
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=8186
 @system unittest
 {
-    // Test for issue 8186
     class B
     {
         int*a;
@@ -4760,24 +4765,24 @@ if (isSIMDVector!V)
     formatTest( B.init, "null" );
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=9336
 @system pure unittest
 {
-    // Test for issue 9336
     shared int i;
     format("%s", &i);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=11778
 @system pure unittest
 {
-    // Test for issue 11778
     int* p = null;
     assertThrown!FormatException(format("%d", p));
     assertThrown!FormatException(format("%04d", p + 2));
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=12505
 @safe pure unittest
 {
-    // Test for issue 12505
     void* p = null;
     formatTest( "%08X", p, "00000000" );
 }
@@ -4810,8 +4815,7 @@ if (isDelegate!T)
                 "([])" );
 }
 
-//------------------------------------------------------------------------------
-// Fix for issue 1591
+// Fix for https://issues.dlang.org/show_bug.cgi?id=1591
 private int getNthInt(string kind, A...)(uint index, A args)
 {
     return getNth!(kind, isIntegral,int)(index, args);
@@ -5697,9 +5701,9 @@ T unformatValue(T, Range, Char)(ref Range input, scope const ref FormatSpec!Char
     assert(str.unformatValue!(int[string])(spec) == ["one": 1, "two": 2]);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=7241
 @safe pure unittest
 {
-    // 7241
     string input = "a";
     auto spec = FormatSpec!char("%s");
     spec.readUpToNextSpec(input);
@@ -6277,7 +6281,7 @@ deprecated
     assert(r == "012345");
     r = format("%o", 9);
     assert(r == "11");
-    r = format("%#o", 0);   // issue 15663
+    r = format("%#o", 0);   // https://issues.dlang.org/show_bug.cgi?id=15663
     assert(r == "0");
 
     r = format("%+d", 123);
@@ -6373,7 +6377,8 @@ deprecated
     assert(format("%8s", "b\u00e9ll\u00f4") == "   b\u00e9ll\u00f4");
 }
 
-@safe pure unittest // bugzilla 18205
+// https://issues.dlang.org/show_bug.cgi?id=18205
+@safe pure unittest
 {
     assert("|%8s|".format("abc")        == "|     abc|");
     assert("|%8s|".format("αβγ")        == "|     αβγ|");
@@ -6385,18 +6390,18 @@ deprecated
     assert("%2s".format("a\u0310\u0337"d) == " a\u0310\u0337");
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=3479
 @safe unittest
 {
-    // bugzilla 3479
     import std.array;
     auto stream = appender!(char[])();
     formattedWrite(stream, "%2$.*1$d", 12, 10);
     assert(stream.data == "000000000010", stream.data);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=6893
 @safe unittest
 {
-    // bug 6893
     import std.array;
     enum E : ulong { A, B, C }
     auto stream = appender!(char[])();
@@ -6897,7 +6902,7 @@ char[] sformat(Char, Args...)(return scope char[] buf, scope const(Char)[] fmt,
     assert(tmp == "2345", tmp);
 }
 
-// Issue 18047
+// https://issues.dlang.org/show_bug.cgi?id=18047
 @safe unittest
 {
     auto cmp = "     123,456";
@@ -6908,7 +6913,7 @@ char[] sformat(Char, Args...)(return scope char[] buf, scope const(Char)[] fmt,
     assert(tmp == cmp, "'" ~ tmp ~ "'");
 }
 
-// Issue 17459
+// https://issues.dlang.org/show_bug.cgi?id=17459
 @safe unittest
 {
     auto cmp = "100";
@@ -6940,7 +6945,7 @@ char[] sformat(Char, Args...)(return scope char[] buf, scope const(Char)[] fmt,
     assert(tmp == cmp, tmp);
 }
 
-// Issue 17459
+// https://issues.dlang.org/show_bug.cgi?id=17459
 @safe unittest
 {
     auto cmp = "100,000";
@@ -6956,7 +6961,7 @@ char[] sformat(Char, Args...)(return scope char[] buf, scope const(Char)[] fmt,
     assert(tmp == cmp, tmp);
 }
 
-// Issue 20288
+// https://issues.dlang.org/show_bug.cgi?id=20288
 @safe unittest
 {
     string s = format("%,.2f", double.nan);
@@ -7038,7 +7043,7 @@ if (is(T == float) || is(T == double) || (is(T == real) && T.mant_dig == double.
     {
         version (DigitalMars)
         {
-            // hack to work around issue 20363
+            // hack to work around https://issues.dlang.org/show_bug.cgi?id=20363
             ival ^= rm;
             ival ^= rm;
         }
@@ -8129,7 +8134,7 @@ printFloat_done:
     assert(printFloat(buf[], -float.infinity, f) == "-inf");
     assert(printFloat(buf[], 0.0f, f) == "0.000000e+00");
     assert(printFloat(buf[], -0.0f, f) == "-0.000000e+00");
-    // cast needed due to bug 20361
+    // cast needed due to https://issues.dlang.org/show_bug.cgi?id=20361
     assert(printFloat(buf[], cast(float) 1e-40, f) == "9.999946e-41");
     assert(printFloat(buf[], cast(float) -1e-40, f) == "-9.999946e-41");
     assert(printFloat(buf[], 1e-30f, f) == "1.000000e-30");
diff --git a/std/functional.d b/std/functional.d
index 06010fe8d29..8b3666db330 100644
--- a/std/functional.d
+++ b/std/functional.d
@@ -128,7 +128,7 @@ template unaryFun(alias fun, string parmName = "a")
     }
     else static if (needOpCallAlias!fun)
     {
-        // Issue 9906
+        // https://issues.dlang.org/show_bug.cgi?id=9906
         alias unaryFun = fun.opCall;
     }
     else
@@ -159,7 +159,7 @@ template unaryFun(alias fun, string parmName = "a")
     int num = 41;
     assert(unaryFun!"a + 1"(num) == 42);
 
-    // Issue 9906
+    // https://issues.dlang.org/show_bug.cgi?id=9906
     struct Seen
     {
         static bool opCall(int n) { return true; }
@@ -222,7 +222,7 @@ template binaryFun(alias fun, string parm1Name = "a",
     }
     else static if (needOpCallAlias!fun)
     {
-        // Issue 9906
+        // https://issues.dlang.org/show_bug.cgi?id=9906
         alias binaryFun = fun.opCall;
     }
     else
@@ -252,7 +252,7 @@ template binaryFun(alias fun, string parm1Name = "a",
     //@@BUG
     //assert(binaryFun!("return a + b;")(41, 1) == 42);
 
-    // Issue 9906
+    // https://issues.dlang.org/show_bug.cgi?id=9906
     struct Seen
     {
         static bool opCall(int x, int y) { return true; }
@@ -840,7 +840,7 @@ template partial(alias fun, alias arg)
     assert(dg2() == 1);
 }
 
-// Fix issue 15732
+// Fix https://issues.dlang.org/show_bug.cgi?id=15732
 @safe unittest
 {
     // Test whether it works with functions.
@@ -1261,7 +1261,8 @@ Note:
 template memoize(alias fun)
 {
     import std.traits : ReturnType;
-    // alias Args = Parameters!fun; // Bugzilla 13580
+     // https://issues.dlang.org/show_bug.cgi?id=13580
+    // alias Args = Parameters!fun;
 
     ReturnType!fun memoize(Parameters!fun args)
     {
@@ -1283,7 +1284,8 @@ template memoize(alias fun)
 template memoize(alias fun, uint maxSize)
 {
     import std.traits : ReturnType;
-    // alias Args = Parameters!fun; // Bugzilla 13580
+     // https://issues.dlang.org/show_bug.cgi?id=13580
+    // alias Args = Parameters!fun;
     ReturnType!fun memoize(Parameters!fun args)
     {
         import std.meta : staticMap;
@@ -1318,7 +1320,9 @@ template memoize(alias fun, uint maxSize)
         if (!bt(initialized.ptr, idx1))
         {
             emplace(&memo[idx1], args, fun(args));
-            bts(initialized.ptr, idx1); // only set to initialized after setting args and value (bugzilla 14025)
+            // only set to initialized after setting args and value
+            // https://issues.dlang.org/show_bug.cgi?id=14025
+            bts(initialized.ptr, idx1);
             return memo[idx1].res;
         }
         else if (memo[idx1].args == args)
@@ -1328,7 +1332,7 @@ template memoize(alias fun, uint maxSize)
         if (!bt(initialized.ptr, idx2))
         {
             emplace(&memo[idx2], memo[idx1]);
-            bts(initialized.ptr, idx2); // only set to initialized after setting args and value (bugzilla 14025)
+            bts(initialized.ptr, idx2);
         }
         else if (memo[idx2].args == args)
             return memo[idx2].res;
@@ -1427,7 +1431,7 @@ unittest
     }
     assert(fact(10) == 3628800);
 
-    // Issue 12568
+    // https://issues.dlang.org/show_bug.cgi?id=12568
     static uint len2(const string s) { // Error
     alias mLen2 = memoize!len2;
     if (s.length == 0)
@@ -1442,7 +1446,8 @@ unittest
     assert(func(int.init) == 1);
 }
 
-// 16079: memoize should work with arrays
+// https://issues.dlang.org/show_bug.cgi?id=16079
+// memoize should work with arrays
 @system unittest // not @safe with -dip1000 due to memoize
 {
     int executed = 0;
@@ -1466,7 +1471,7 @@ unittest
     assert(executed == 1);
 }
 
-// 16079: memoize should work with structs
+// https://issues.dlang.org/show_bug.cgi?id=16079: memoize should work with structs
 @safe unittest
 {
     int executed = 0;
@@ -1485,7 +1490,7 @@ unittest
     assert(executed == 1);
 }
 
-// 20439 memoize should work with void opAssign
+// https://issues.dlang.org/show_bug.cgi?id=20439 memoize should work with void opAssign
 @safe unittest
 {
     static struct S
@@ -1496,7 +1501,7 @@ unittest
     assert(memoize!(() => S()) == S());
 }
 
-// 16079: memoize should work with classes
+// https://issues.dlang.org/show_bug.cgi?id=16079: memoize should work with classes
 @system unittest // not @safe with -dip1000 due to memoize
 {
     int executed = 0;
diff --git a/std/getopt.d b/std/getopt.d
index ebcef9d99a4..cbc5a1dd46a 100644
--- a/std/getopt.d
+++ b/std/getopt.d
@@ -657,7 +657,8 @@ private template optionValidator(A...)
     static assert(optionValidator!(C,A,P,C,A,S,F) == "");
 }
 
-@safe unittest // bugzilla 15914
+// https://issues.dlang.org/show_bug.cgi?id=15914
+@safe unittest
 {
     import std.exception : assertThrown;
     bool opt;
@@ -981,7 +982,7 @@ private bool handleOption(R)(string option, R receiver, ref string[] args,
     return ret;
 }
 
-// 17574
+// https://issues.dlang.org/show_bug.cgi?id=17574
 @safe unittest
 {
     import std.algorithm.searching : startsWith;
@@ -1001,7 +1002,7 @@ private bool handleOption(R)(string option, R receiver, ref string[] args,
         assert(goe.msg.startsWith("Could not find"));
 }
 
-// 5316 - arrays with arraySep
+// https://issues.dlang.org/show_bug.cgi?id=5316 - arrays with arraySep
 @safe unittest
 {
     import std.conv;
@@ -1030,7 +1031,7 @@ private bool handleOption(R)(string option, R receiver, ref string[] args,
     assert(names == ["foo", "bar", "baz"], to!string(names));
 }
 
-// 5316 - associative arrays with arraySep
+// https://issues.dlang.org/show_bug.cgi?id=5316 - associative arrays with arraySep
 @safe unittest
 {
     import std.conv;
@@ -1376,9 +1377,9 @@ private void setConfig(ref configuration cfg, config option) @safe pure nothrow
     assert(x == 2);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=2142
 @safe unittest
 {
-    // From bugzilla 2142
     bool f_linenum, f_filename;
     string[] args = [ "", "-nl" ];
     getopt
@@ -1393,9 +1394,9 @@ private void setConfig(ref configuration cfg, config option) @safe pure nothrow
     assert(f_filename);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=6887
 @safe unittest
 {
-    // From bugzilla 6887
     string[] p;
     string[] args = ["", "-pa"];
     getopt(args, "p", &p);
@@ -1403,18 +1404,18 @@ private void setConfig(ref configuration cfg, config option) @safe pure nothrow
     assert(p[0] == "a");
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=6888
 @safe unittest
 {
-    // From bugzilla 6888
     int[string] foo;
     auto args = ["", "-t", "a=1"];
     getopt(args, "t", &foo);
     assert(foo == ["a":1]);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=9583
 @safe unittest
 {
-    // From bugzilla 9583
     int opt;
     auto args = ["prog", "--opt=123", "--", "--a", "--b", "--c"];
     getopt(args, "opt", &opt);
@@ -1429,7 +1430,7 @@ private void setConfig(ref configuration cfg, config option) @safe pure nothrow
     assert(foo == "hello");
     assert(bar == "bar=baz");
 
-    // From bugzilla 5762
+    // From https://issues.dlang.org/show_bug.cgi?id=5762
     string a;
     args = ["prog", "-a-0x12"];
     getopt(args, config.bundling, "a|addr", &a);
@@ -1438,7 +1439,7 @@ private void setConfig(ref configuration cfg, config option) @safe pure nothrow
     getopt(args, config.bundling, "a|addr", &a);
     assert(a == "-0x12");
 
-    // From https://d.puremagic.com/issues/show_bug.cgi?id=11764
+    // From https://issues.dlang.org/show_bug.cgi?id=11764
     args = ["main", "-test"];
     bool opt;
     args.getopt(config.passThrough, "opt", &opt);
@@ -1456,7 +1457,8 @@ private void setConfig(ref configuration cfg, config option) @safe pure nothrow
     assert(o == "str");
 }
 
-@safe unittest // 5228
+// https://issues.dlang.org/show_bug.cgi?id=5228
+@safe unittest
 {
     import std.conv;
     import std.exception;
@@ -1469,7 +1471,8 @@ private void setConfig(ref configuration cfg, config option) @safe pure nothrow
     assertThrown!ConvException(getopt(args, "abc", &abc));
 }
 
-@safe unittest // From bugzilla 7693
+// https://issues.dlang.org/show_bug.cgi?id=7693
+@safe unittest
 {
     import std.exception;
 
@@ -1489,7 +1492,8 @@ private void setConfig(ref configuration cfg, config option) @safe pure nothrow
     assertNotThrown(getopt(args, "foo", &foo));
 }
 
-@safe unittest // same bug as 7693 only for bool
+// Same as https://issues.dlang.org/show_bug.cgi?id=7693 only for `bool`
+@safe unittest
 {
     import std.exception;
 
@@ -1574,7 +1578,8 @@ private void setConfig(ref configuration cfg, config option) @safe pure nothrow
     assert(r.helpWanted);
 }
 
-// Issue 13316 - std.getopt: implicit help option breaks the next argument
+// std.getopt: implicit help option breaks the next argument
+// https://issues.dlang.org/show_bug.cgi?id=13316
 @safe unittest
 {
     string[] args = ["program", "--help", "--", "something"];
@@ -1591,7 +1596,8 @@ private void setConfig(ref configuration cfg, config option) @safe pure nothrow
     assert(args == ["program", "nonoption", "--option"]);
 }
 
-// Issue 13317 - std.getopt: endOfOptions broken when it doesn't look like an option
+// std.getopt: endOfOptions broken when it doesn't look like an option
+// https://issues.dlang.org/show_bug.cgi?id=13317
 @safe unittest
 {
     auto endOfOptionsBackup = endOfOptions;
@@ -1604,7 +1610,8 @@ private void setConfig(ref configuration cfg, config option) @safe pure nothrow
     assert(args == ["program", "--option"]);
 }
 
-// Issue 20480 - make std.getopt ready for DIP 1000
+// make std.getopt ready for DIP 1000
+// https://issues.dlang.org/show_bug.cgi?id=20480
 @safe unittest
 {
     string[] args = ["test", "--foo", "42", "--bar", "BAR"];
@@ -1738,7 +1745,8 @@ void defaultGetoptFormatter(Output)(Output output, string text, Option[] opt, st
     assert(wanted == helpMsg, helpMsg ~ wanted);
 }
 
-@safe unittest // Issue 14724
+// https://issues.dlang.org/show_bug.cgi?id=14724
+@safe unittest
 {
     bool a;
     auto args = ["prog", "--help"];
@@ -1769,7 +1777,8 @@ void defaultGetoptFormatter(Output)(Output output, string text, Option[] opt, st
     assertNotThrown!AssertError(getopt(args, "abc", &abc, "def", &def));
 }
 
-@safe unittest // Issue 17327 repeated option use
+// https://issues.dlang.org/show_bug.cgi?id=17327 repeated option use
+@safe unittest
 {
     long num = 0;
 
@@ -1856,7 +1865,9 @@ void defaultGetoptFormatter(Output)(Output output, string text, Option[] opt, st
     assert(y == 50);
 }
 
-@safe unittest // Hyphens at the start of option values; Issue 17650
+// Hyphens at the start of option values;
+// https://issues.dlang.org/show_bug.cgi?id=17650
+@safe unittest
 {
     auto args = ["program", "-m", "-5", "-n", "-50", "-c", "-", "-f", "-"];
 
diff --git a/std/internal/cstring.d b/std/internal/cstring.d
index 8453fd297c9..8aed7bbf1fa 100644
--- a/std/internal/cstring.d
+++ b/std/internal/cstring.d
@@ -84,7 +84,8 @@ if (isSomeChar!To && (isInputRange!From || isSomeString!From) &&
 
     // Note: res._ptr can't point to res._buff as structs are movable.
 
-    static if (isSomeString!From) // Bugzilla 1498
+    // https://issues.dlang.org/show_bug.cgi?id=1498
+    static if (isSomeString!From)
     {
         if (str is null)
         {
@@ -200,7 +201,7 @@ nothrow @nogc @system unittest
     assert(tempCString(abc[].byChar)[] == abc);
 }
 
-// Bugzilla 14980
+// https://issues.dlang.org/show_bug.cgi?id=14980
 pure nothrow @nogc @safe unittest
 {
     const(char[]) str = null;
diff --git a/std/internal/digest/sha_SSSE3.d b/std/internal/digest/sha_SSSE3.d
index ff27e638526..5598324208d 100644
--- a/std/internal/digest/sha_SSSE3.d
+++ b/std/internal/digest/sha_SSSE3.d
@@ -17,7 +17,7 @@ module std.internal.digest.sha_SSSE3;
 
 version (D_InlineAsm_X86)
 {
-    version (D_PIC) {} // Bugzilla 9378
+    version (D_PIC) {} // https://issues.dlang.org/show_bug.cgi?id=9378
     else
     {
         private version = USE_SSSE3;
@@ -721,7 +721,8 @@ version (USE_SSSE3)
         }
     }
 
-    // constants as extra argument for PIC, see Bugzilla 9378
+    // constants as extra argument for PIC
+    // https://issues.dlang.org/show_bug.cgi?id=9378
     import std.meta : AliasSeq;
     version (_64Bit)
         alias ExtraArgs = AliasSeq!(typeof(&constants));
diff --git a/std/internal/math/biguintcore.d b/std/internal/math/biguintcore.d
index ead344cb704..4ad12edf8ab 100644
--- a/std/internal/math/biguintcore.d
+++ b/std/internal/math/biguintcore.d
@@ -54,7 +54,8 @@ import std.traits;
 private:
 
 // dipatchers to the right low-level primitives. Added to allow BigInt CTFE for
-// 32 bit systems (issue 14767) although it's used by the other architectures too.
+// 32 bit systems (https://issues.dlang.org/show_bug.cgi?id=14767) although it's
+// used by the other architectures too.
 // See comments below in case it has to be refactored.
 version (X86)
 uint multibyteAddSub(char op)(uint[] dest, const(uint)[] src1, const (uint)[] src2, uint carry)
@@ -1127,16 +1128,17 @@ public:
     // ulong comparison test
     BigUint a = [1];
     assert(a == 1);
-    assert(a < 0x8000_0000_0000_0000UL); // bug 9548
+    // https://issues.dlang.org/show_bug.cgi?id=9548
+    assert(a < 0x8000_0000_0000_0000UL);
 
-    // bug 12234
+    // https://issues.dlang.org/show_bug.cgi?id=12234
     BigUint z = [0];
     assert(z == 0UL);
     assert(!(z > 0UL));
     assert(!(z < 0UL));
 }
 
-// issue 16223
+// https://issues.dlang.org/show_bug.cgi?id=16223
 @system pure nothrow unittest
 {
     BigUint a = [3];
diff --git a/std/json.d b/std/json.d
index 278a07098a0..f5035e32173 100644
--- a/std/json.d
+++ b/std/json.d
@@ -459,7 +459,8 @@ struct JSONValue
             string t = arg;
             () @trusted { store.str = t; }();
         }
-        else static if (isSomeString!T) // issue 15884
+        // https://issues.dlang.org/show_bug.cgi?id=15884
+        else static if (isSomeString!T)
         {
             type_tag = JSONType.string;
             // FIXME: std.Array.Array(Range) is not deduced as 'pure'
@@ -1377,7 +1378,8 @@ if (isInputRange!T && !isInfinite!T && isSomeChar!(ElementEncodingType!T))
     assert(json["key1"]["key2"].integer == 1);
 }
 
-@safe unittest // issue 20527
+// https://issues.dlang.org/show_bug.cgi?id=20527
+@safe unittest
 {
     static assert(parseJSON(`{"a" : 2}`)["a"].integer == 2);
 }
@@ -1552,7 +1554,7 @@ if (isOutputRange!(Out,char))
                     }
 
                     import std.algorithm.sorting : sort;
-                    // @@@BUG@@@ 14439
+                    // https://issues.dlang.org/show_bug.cgi?id=14439
                     // auto names = obj.keys;  // aa.keys can't be called in @safe code
                     auto names = new string[obj.length];
                     size_t i = 0;
@@ -1663,7 +1665,8 @@ if (isOutputRange!(Out,char))
     toValue(root, 0);
 }
 
-@safe unittest // bugzilla 12897
+ // https://issues.dlang.org/show_bug.cgi?id=12897
+@safe unittest
 {
     JSONValue jv0 = JSONValue("test测试");
     assert(toJSON(jv0, false, JSONOptions.escapeNonAsciiChars) == `"test\u6D4B\u8BD5"`);
@@ -1677,7 +1680,8 @@ if (isOutputRange!(Out,char))
     assert(toJSON(jv1, false, JSONOptions.none) == `"été"`);
 }
 
-@system unittest // bugzilla 20511
+// https://issues.dlang.org/show_bug.cgi?id=20511
+@system unittest
 {
     import std.format : formattedWrite;
     import std.range : nullSink, outputRangeObject;
@@ -1783,10 +1787,9 @@ class JSONException : Exception
     assert(jv3.str == "\u001C");
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=11504
 @system unittest
 {
-    // Bugzilla 11504
-
     JSONValue jv = 1;
     assert(jv.type == JSONType.integer);
 
@@ -1958,7 +1961,7 @@ class JSONException : Exception
 
 @system pure unittest
 {
-    // Bugzilla 12969
+    // https://issues.dlang.org/show_bug.cgi?id=12969
 
     JSONValue jv;
     jv["int"] = 123;
@@ -2058,7 +2061,8 @@ pure nothrow @safe @nogc unittest
     assert(testVal.isNull);
 }
 
-pure nothrow @safe unittest // issue 15884
+// https://issues.dlang.org/show_bug.cgi?id=15884
+pure nothrow @safe unittest
 {
     import std.typecons;
     void Test(C)() {
@@ -2073,7 +2077,8 @@ pure nothrow @safe unittest // issue 15884
     Test!dchar();
 }
 
-@safe unittest // issue 15885
+// https://issues.dlang.org/show_bug.cgi?id=15885
+@safe unittest
 {
     enum bool realInDoublePrecision = real.mant_dig == double.mant_dig;
 
@@ -2107,34 +2112,39 @@ pure nothrow @safe unittest // issue 15884
     assert(test(3*minSub));
 }
 
-@safe unittest // issue 17555
+// https://issues.dlang.org/show_bug.cgi?id=17555
+@safe unittest
 {
     import std.exception : assertThrown;
 
     assertThrown!JSONException(parseJSON("\"a\nb\""));
 }
 
-@safe unittest // issue 17556
+// https://issues.dlang.org/show_bug.cgi?id=17556
+@safe unittest
 {
     auto v = JSONValue("\U0001D11E");
     auto j = toJSON(v, false, JSONOptions.escapeNonAsciiChars);
     assert(j == `"\uD834\uDD1E"`);
 }
 
-@safe unittest // issue 5904
+// https://issues.dlang.org/show_bug.cgi?id=5904
+@safe unittest
 {
     string s = `"\uD834\uDD1E"`;
     auto j = parseJSON(s);
     assert(j.str == "\U0001D11E");
 }
 
-@safe unittest // issue 17557
+// https://issues.dlang.org/show_bug.cgi?id=17557
+@safe unittest
 {
     assert(parseJSON("\"\xFF\"").str == "\xFF");
     assert(parseJSON("\"\U0001D11E\"").str == "\U0001D11E");
 }
 
-@safe unittest // issue 17553
+// https://issues.dlang.org/show_bug.cgi?id=17553
+@safe unittest
 {
     auto v = JSONValue("\xFF");
     assert(toJSON(v) == "\"\xFF\"");
@@ -2147,7 +2157,8 @@ pure nothrow @safe unittest // issue 15884
     assert(parseJSON("\"\U0001D11E\"".byChar).str == "\U0001D11E");
 }
 
-@safe unittest // JSONOptions.doNotEscapeSlashes (issue 17587)
+// JSONOptions.doNotEscapeSlashes (https://issues.dlang.org/show_bug.cgi?id=17587)
+@safe unittest
 {
     assert(parseJSON(`"/"`).toString == `"\/"`);
     assert(parseJSON(`"\/"`).toString == `"\/"`);
@@ -2155,7 +2166,8 @@ pure nothrow @safe unittest // issue 15884
     assert(parseJSON(`"\/"`).toString(JSONOptions.doNotEscapeSlashes) == `"/"`);
 }
 
-@safe unittest // JSONOptions.strictParsing (issue 16639)
+// JSONOptions.strictParsing (https://issues.dlang.org/show_bug.cgi?id=16639)
+@safe unittest
 {
     import std.exception : assertThrown;
 
@@ -2252,7 +2264,7 @@ pure nothrow @safe unittest // issue 15884
     assertThrown(parseJSON(s, -1, JSONOptions.strictParsing));
 }
 
-// Issue20330
+// https://issues.dlang.org/show_bug.cgi?id=20330
 @safe unittest
 {
     import std.array : appender;
@@ -2266,7 +2278,7 @@ pure nothrow @safe unittest // issue 15884
     assert(app.data == s, app.data);
 }
 
-// Issue20330
+// https://issues.dlang.org/show_bug.cgi?id=20330
 @safe unittest
 {
     import std.array : appender;
diff --git a/std/math.d b/std/math.d
index 33db70e60e4..61dcd3c9f1c 100644
--- a/std/math.d
+++ b/std/math.d
@@ -661,7 +661,8 @@ deprecated
     }}
 }
 
-// see issue #20205, to avoid falling into the trap again
+// see https://issues.dlang.org/show_bug.cgi?id=20205
+// to avoid falling into the trap again
 @safe pure nothrow @nogc unittest
 {
     assert(50 - abs(-100) == -50);
@@ -727,8 +728,8 @@ auto conj(Num)(Num z) @safe pure nothrow @nogc
 if (is(Num* : const(cfloat*)) || is(Num* : const(cdouble*))
     || is(Num* : const(creal*)))
 {
-    //FIXME
-    //Issue 14206
+    // FIXME
+    // https://issues.dlang.org/show_bug.cgi?id=14206
     static if (is(Num* : const(cdouble*)))
         return cast(cdouble) conj(cast(creal) z);
     else
@@ -751,7 +752,8 @@ deprecated
     ireal z = -3.2Li;
     assert(conj(z) == -z);
 }
-//Issue 14206
+
+// https://issues.dlang.org/show_bug.cgi?id=14206
 deprecated
 @safe pure nothrow @nogc unittest
 {
@@ -760,7 +762,8 @@ deprecated
     idouble z = -3.2i;
     assert(conj(z) == -z);
 }
-//Issue 14206
+
+// https://issues.dlang.org/show_bug.cgi?id=14206
 deprecated
 @safe pure nothrow @nogc unittest
 {
@@ -3583,7 +3586,7 @@ if (isFloatingPoint!T)
              tuple(T.nan, T.nan, int.min),
              tuple(-T.nan, -T.nan, int.min),
 
-             // Phobos issue #16026:
+             // https://issues.dlang.org/show_bug.cgi?id=16026:
              tuple(3 * (T.min_normal * T.epsilon), T( .75), (T.min_exp - T.mant_dig) + 2)
              ];
 
@@ -3644,7 +3647,7 @@ if (isFloatingPoint!T)
              tuple(T.nan, T.nan, int.min),
              tuple(-T.nan, -T.nan, int.min),
 
-             // Phobos issue #16026:
+             // https://issues.dlang.org/show_bug.cgi?id=16026:
              tuple(3 * (T.min_normal * T.epsilon), T( .75), (T.min_exp - T.mant_dig) + 2)
              ];
 
@@ -4010,7 +4013,8 @@ float ldexp(float n, int exp) @safe pure nothrow @nogc { return ldexp(cast(real)
     else static assert(false, "Floating point type real not supported");
 }
 
-/* workaround Issue 14718, float parsing depends on platform strtold
+/* workaround https://issues.dlang.org/show_bug.cgi?id=14718
+   float parsing depends on platform strtold
 @safe pure nothrow @nogc unittest
 {
     assert(ldexp(1.0, -1024) == 0x1p-1024);
@@ -8112,7 +8116,7 @@ if (isIntegral!(F) && isIntegral!(G))
     assert(pow(three, four) == 81);
 }
 
-// issue 7006
+// https://issues.dlang.org/show_bug.cgi?id=7006
 @safe pure nothrow @nogc unittest
 {
     assert(pow(5, -1) == 0);
@@ -8457,7 +8461,7 @@ if (isFloatingPoint!(F) && isFloatingPoint!(G))
     assert(isIdentical(pow(0.0, 6.0), 0.0));
     assert(isIdentical(pow(-0.0, 6.0), 0.0));
 
-    // Issue #14786 fixed
+    // https://issues.dlang.org/show_bug.cgi?id=14786 fixed
     immutable real maxOdd = pow(2.0L, real.mant_dig) - 1.0L;
     assert(pow(-1.0L,  maxOdd) == -1.0L);
     assert(pow(-1.0L, -maxOdd) == -1.0L);
@@ -9300,7 +9304,7 @@ bool approxEqual(T, U, V)(T value, U reference, V maxRelDiff = 1e-2, V maxAbsDif
 {
     // relative comparison depends on reference, make sure proper
     // side is used when comparing range to single value. Based on
-    // bugzilla issue 15763
+    // https://issues.dlang.org/show_bug.cgi?id=15763
     auto a = [2e-3 - 1e-5];
     auto b = 2e-3 + 1e-5;
     assert(a[0].approxEqual(b));
@@ -9692,9 +9696,10 @@ private template FloatingPointBaseType(T)
     }
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=6381
+// floor/ceil should be usable in pure function.
 @safe pure nothrow unittest
 {
-    // issue 6381: floor/ceil should be usable in pure function.
     auto x = floor(1.2);
     auto y = ceil(1.2);
 }
@@ -10092,7 +10097,8 @@ if (isFloatingPoint!T)
     }}
 }
 
-@safe @nogc pure nothrow unittest // Issue 15973
+// https://issues.dlang.org/show_bug.cgi?id=15973
+@safe @nogc pure nothrow unittest
 {
     assert(nextPow2(uint.max / 2) == uint.max / 2 + 1);
     assert(nextPow2(uint.max / 2 + 2) == 0);
diff --git a/std/meta.d b/std/meta.d
index 8d32fb31a5c..2e554f5201f 100644
--- a/std/meta.d
+++ b/std/meta.d
@@ -517,10 +517,10 @@ template NoDuplicates(TList...)
 {
     import std.range : iota;
 
-    // Bugzilla 14561: huge enums
+    // https://issues.dlang.org/show_bug.cgi?id=14561: huge enums
     alias LongList = Repeat!(1500, int);
     static assert(NoDuplicates!LongList.length == 1);
-    // Bugzilla 17995: huge enums, revisited
+    // https://issues.dlang.org/show_bug.cgi?id=17995: huge enums, revisited
 
     alias a = NoDuplicates!(AliasSeq!(1, Repeat!(1000, 3)));
     alias b = NoDuplicates!(AliasSeq!(1, Repeat!(10, 3)));
diff --git a/std/mmfile.d b/std/mmfile.d
index 29dedccd034..a6733420aa0 100644
--- a/std/mmfile.d
+++ b/std/mmfile.d
@@ -676,7 +676,7 @@ private:
 }
 
 version (linux)
-@system unittest // Issue 14868
+@system unittest // https://issues.dlang.org/show_bug.cgi?id=14868
 {
     import std.file : deleteme;
     import std.typecons : scoped;
@@ -699,7 +699,9 @@ version (linux)
     assert(.close(fd) == -1);
 }
 
-@system unittest // Issue 14994, 14995
+// https://issues.dlang.org/show_bug.cgi?id=14994
+// https://issues.dlang.org/show_bug.cgi?id=14995
+@system unittest
 {
     import std.file : deleteme;
     import std.typecons : scoped;
diff --git a/std/net/curl.d b/std/net/curl.d
index 05f335ca55c..7ea2cebb30f 100644
--- a/std/net/curl.d
+++ b/std/net/curl.d
@@ -215,7 +215,8 @@ version (StdUnittest)
             }
             catch (Throwable e)
             {
-                stderr.writeln(e);  // Bugzilla 7018
+                // https://issues.dlang.org/show_bug.cgi?id=7018
+                stderr.writeln(e);
             }
         }
     }
@@ -1114,7 +1115,8 @@ private auto _basicHTTP(T)(const(char)[] url, const(void)[] sendData, HTTP clien
     assert(e.status == 404);
 }
 
-// Bugzilla 14760 - content length must be reset after post
+// Content length must be reset after post
+// https://issues.dlang.org/show_bug.cgi?id=14760
 @system unittest
 {
     import std.algorithm.searching : canFind;
@@ -2097,7 +2099,7 @@ private mixin template Protocol()
         http.setAuthentication("user", "pass");
         http.perform();
 
-        // Bugzilla 17540
+        // https://issues.dlang.org/show_bug.cgi?id=17540
         http.setNoProxy("www.example.com");
     }
 
@@ -3299,7 +3301,7 @@ struct HTTP
         http.perform();
         assert(http.p.charset == "foo");
 
-        // Bugzilla 16736
+        // https://issues.dlang.org/show_bug.cgi?id=16736
         double val;
         CurlCode code;
 
@@ -4899,7 +4901,7 @@ private struct Pool(Data)
 private struct _async()
 {
 static:
-    // @@@@BUG 15831@@@@
+    // https://issues.dlang.org/show_bug.cgi?id=15831
     // this should be inside byLineAsync
     // Range that reads one chunk at a time asynchronously.
     private struct ChunkInputRange
@@ -4928,7 +4930,7 @@ static:
         }
     }
 
-    // @@@@BUG 15831@@@@
+    // https://issues.dlang.org/show_bug.cgi?id=15831
     // this should be inside byLineAsync
     // Range that reads one line at a time asynchronously.
     private static struct LineInputRange(Char)
diff --git a/std/numeric.d b/std/numeric.d
index d32688c16d4..b3b2591fd9d 100644
--- a/std/numeric.d
+++ b/std/numeric.d
@@ -605,7 +605,7 @@ public:
     template toString()
     {
         import std.format : FormatSpec, formatValue;
-        // Needs to be a template because of DMD @@BUG@@ 13737.
+        // Needs to be a template because of https://issues.dlang.org/show_bug.cgi?id=13737.
         void toString()(scope void delegate(const(char)[]) sink, scope const ref FormatSpec!char fmt)
         {
             sink.formatValue(get!real, fmt);
@@ -1675,7 +1675,7 @@ T findRoot(T, R)(scope R delegate(T) f, in T a, in T b,
    printf("POWER TOTAL = %d avg = %f ", powercalls,
         (1.0*powercalls)/powerProblems);
 */
-    //Issue 14231
+    // https://issues.dlang.org/show_bug.cgi?id=14231
     auto xp = findRoot((float x) => x, 0f, 1f);
     auto xn = findRoot((float x) => x, -1f, -0f);
 }
@@ -3048,7 +3048,7 @@ if (!isIntegral!T &&
     }
 }
 
-// Issue 7102
+// https://issues.dlang.org/show_bug.cgi?id=7102
 @system pure unittest
 {
     import std.bigint : BigInt;
@@ -3078,7 +3078,7 @@ if (!isIntegral!T &&
     assert(gcd(CrippledInt(2310), CrippledInt(1309)) == CrippledInt(77));
 }
 
-// Issue 19514
+// https://issues.dlang.org/show_bug.cgi?id=19514
 @system pure unittest
 {
     import std.bigint : BigInt;
@@ -3337,7 +3337,9 @@ private:
     //
     // Also, this is unsafe because the memSpace buffer will be cast
     // to immutable.
-    public this(lookup_t[] memSpace)  // Public b/c of bug 4636.
+    //
+    // Public b/c of https://issues.dlang.org/show_bug.cgi?id=4636.
+    public this(lookup_t[] memSpace)
     {
         immutable size = memSpace.length / 2;
 
diff --git a/std/parallelism.d b/std/parallelism.d
index 2170ca93a70..4c638dc0702 100644
--- a/std/parallelism.d
+++ b/std/parallelism.d
@@ -553,7 +553,8 @@ struct Task(alias fun, Args...)
         }
     }
 
-    // Work around DMD bug 6588, allow immutable elements.
+    // Work around DMD bug https://issues.dlang.org/show_bug.cgi?id=6588,
+    // allow immutable elements.
     static if (allSatisfy!(isAssignable, Args))
     {
         typeof(this) opAssign(typeof(this) rhs)
@@ -1464,7 +1465,7 @@ private:
 
         // Disabled until writing code to support
         // running thread with specified priority
-        // See https://d.puremagic.com/issues/show_bug.cgi?id=8960
+        // See https://issues.dlang.org/show_bug.cgi?id=8960
 
         /*if (priority != int.max)
         {
@@ -2709,8 +2710,8 @@ public:
             alias RTask = Task!(run, typeof(&reduceOnRange), R, size_t, size_t);
             RTask[] tasks;
 
-            // Can't use alloca() due to Bug 3753.  Use a fixed buffer
-            // backed by malloc().
+            // Can't use alloca() due to https://issues.dlang.org/show_bug.cgi?id=3753
+            // Use a fixed buffer backed by malloc().
             enum maxStack = 2_048;
             byte[maxStack] buf = void;
             immutable size_t nBytesNeeded = nWorkUnits * RTask.sizeof;
@@ -3581,7 +3582,8 @@ ParallelForeach!R parallel(R)(R range, size_t workUnitSize)
     return taskPool.parallel(range, workUnitSize);
 }
 
-// #17019: `each` should be usable with parallel
+//  `each` should be usable with parallel
+// https://issues.dlang.org/show_bug.cgi?id=17019
 @system unittest
 {
     import std.algorithm.iteration : each, sum;
@@ -3628,9 +3630,10 @@ private void submitAndExecute(
     // The logical thing to do would be to just use alloca() here, but that
     // causes problems on Windows for reasons that I don't understand
     // (tentatively a compiler bug) and definitely doesn't work on Posix due
-    // to Bug 3753.  Therefore, allocate a fixed buffer and fall back to
-    // malloc() if someone's using a ridiculous amount of threads.  Also,
-    // the using a byte array instead of a PTask array as the fixed buffer
+    // to https://issues.dlang.org/show_bug.cgi?id=3753.
+    // Therefore, allocate a fixed buffer and fall back to `malloc()` if
+    // someone's using a ridiculous amount of threads.
+    // Also, the using a byte array instead of a PTask array as the fixed buffer
     // is to prevent d'tors from being called on uninitialized excess PTask
     // instances.
     enum nBuf = 64;
@@ -4363,7 +4366,7 @@ version (StdUnittest)
         pool2.finish(true); // blocking
         assert(tSlow2.done);
 
-        // Test fix for Bug 8582 by making pool size zero.
+        // Test fix for https://issues.dlang.org/show_bug.cgi?id=8582 by making pool size zero.
         auto pool3 = new TaskPool(0);
         auto tSlow3 = task!slowFun();
         pool3.put(tSlow3);
diff --git a/std/path.d b/std/path.d
index 5d96de3649f..73eafdd5e40 100644
--- a/std/path.d
+++ b/std/path.d
@@ -1238,7 +1238,7 @@ if (isSomeChar!C1 && is(Unqual!C1 == Unqual!C2))
     static assert(setExtension("file"w.dup, "ext"w) == "file.ext");
     static assert(setExtension("file.old"d.dup, "new"d) == "file.new");
 
-    // Issue 10601
+    // https://issues.dlang.org/show_bug.cgi?id=10601
     assert(setExtension("file", "") == "file");
     assert(setExtension("file.ext", "") == "file");
 }
diff --git a/std/process.d b/std/process.d
index be36ac9e869..7cf55efe486 100644
--- a/std/process.d
+++ b/std/process.d
@@ -1268,7 +1268,8 @@ private Pid spawnProcessImpl(scope const(char)[] commandLine,
     DWORD dwCreationFlags =
         CREATE_UNICODE_ENVIRONMENT |
         ((config & Config.suppressConsole) ? CREATE_NO_WINDOW : 0);
-    auto pworkDir = workDir.tempCStringW();     // workaround until Bugzilla 14696 is fixed
+    // workaround until https://issues.dlang.org/show_bug.cgi?id=14696 is fixed
+    auto pworkDir = workDir.tempCStringW();
     if (!CreateProcessW(null, commandLine.tempCStringW().buffPtr,
                         null, null, true, dwCreationFlags,
                         envz, workDir.length ? pworkDir : null, &startinfo, &pi))
@@ -1739,7 +1740,8 @@ version (Posix) @system unittest
     spawnProcess([prog.path], null, Config.none, directory).wait();
 }
 
-@system unittest // Reopening the standard streams (issue 13258)
+// Reopening the standard streams (https://issues.dlang.org/show_bug.cgi?id=13258)
+@system unittest
 {
     import std.string;
     import std.file;
@@ -1765,8 +1767,9 @@ version (Posix) @system unittest
     assert(lines == ["foo", "bar"]);
 }
 
+// MSVCRT workaround (https://issues.dlang.org/show_bug.cgi?id=14422)
 version (Windows)
-@system unittest // MSVCRT workaround (issue 14422)
+@system unittest
 {
     auto fn = uniqueTempPath();
     std.file.write(fn, "AAAAAAAAAA");
diff --git a/std/random.d b/std/random.d
index 6912a3ab395..bb41aac0e67 100644
--- a/std/random.d
+++ b/std/random.d
@@ -163,11 +163,11 @@ else version (WatchOS)
     assert(10.iota.randomSample(3, rnd2).equal([7, 8, 9]));
 
     // Cover all elements in an array in random order
-    version (X86_64) // Issue 15147
+    version (X86_64) // https://issues.dlang.org/show_bug.cgi?id=15147
     assert(10.iota.randomCover(rnd2).equal([7, 4, 2, 0, 1, 6, 8, 3, 9, 5]));
 
     // Shuffle an array
-    version (X86_64) // Issue 15147
+    version (X86_64) // https://issues.dlang.org/show_bug.cgi?id=15147
     assert([0, 1, 2, 4, 5].randomShuffle(rnd2).equal([2, 0, 4, 5, 1]));
 }
 
@@ -283,7 +283,8 @@ template isUniformRNG(Rng)
 
 @safe unittest
 {
-    // Issue 19837: two-argument predicate should not require @property on `front`.
+    // two-argument predicate should not require @property on `front`
+    // https://issues.dlang.org/show_bug.cgi?id=19837
     struct Rng
     {
         float front() {return 0;}
@@ -709,7 +710,8 @@ alias MinstdRand = LinearCongruentialEngine!(uint, 48_271, 0, 2_147_483_647);
     {{
         auto rnd1 = Type(123_456_789);
         rnd1.popFront();
-        auto rnd2 = ((const ref Type a) => a.save())(rnd1); // Issue 15853.
+        // https://issues.dlang.org/show_bug.cgi?id=15853
+        auto rnd2 = ((const ref Type a) => a.save())(rnd1);
         assert(rnd1 == rnd2);
         // Enable next test when RNGs are reference types
         version (none) { assert(rnd1 !is rnd2); }
@@ -1158,7 +1160,8 @@ alias Mt19937_64 = MersenneTwisterEngine!(ulong, 64, 312, 156, 31,
     {{
         auto gen1 = Type(123_456_789);
         gen1.popFront();
-        auto gen2 = ((const ref Type a) => a.save())(gen1); // Issue 15853.
+        // https://issues.dlang.org/show_bug.cgi?id=15853
+        auto gen2 = ((const ref Type a) => a.save())(gen1);
         assert(gen1 == gen2);  // Danger, Will Robinson -- no opEquals for MT
         // Enable next test when RNGs are reference types
         version (none) { assert(gen1 !is gen2); }
@@ -1167,7 +1170,8 @@ alias Mt19937_64 = MersenneTwisterEngine!(ulong, 64, 312, 156, 31,
     }}
 }
 
-@safe @nogc pure nothrow unittest //11690
+// https://issues.dlang.org/show_bug.cgi?id=11690
+@safe @nogc pure nothrow unittest
 {
     alias MT(UIntType, uint w) = MersenneTwisterEngine!(UIntType, w, 624, 397, 31,
                                                         0x9908b0df, 11, 0xffffffff, 7,
@@ -1596,7 +1600,8 @@ alias Xorshift    = Xorshift128;                            /// ditto
     {
         auto rnd1 = Type(123_456_789);
         rnd1.popFront();
-        auto rnd2 = ((const ref Type a) => a.save())(rnd1); // Issue 15853.
+        // https://issues.dlang.org/show_bug.cgi?id=15853
+        auto rnd2 = ((const ref Type a) => a.save())(rnd1);
         assert(rnd1 == rnd2);
         // Enable next test when RNGs are reference types
         version (none) { assert(rnd1 !is rnd2); }
@@ -1667,10 +1672,10 @@ else
 {
     private ulong bootstrapSeed() @nogc nothrow
     {
-        // Issue 19580 - previously used `ulong result = void` to start with
-        // an arbitary value but using an uninitialized variable's value is
-        // undefined behavior and enabled unwanted optimizations on non-DMD
-        // compilers.
+        // https://issues.dlang.org/show_bug.cgi?id=19580
+        // previously used `ulong result = void` to start with an arbitary value
+        // but using an uninitialized variable's value is undefined behavior
+        // and enabled unwanted optimizations on non-DMD compilers.
         ulong result;
         enum ulong m = 0xc6a4_a793_5bd1_e995UL; // MurmurHash2_64A constant.
         void updateResult(ulong x)
@@ -2380,7 +2385,7 @@ if (!is(T == enum) && (isIntegral!T || isSomeChar!T))
     assert(rnd.uniform!ulong == 4838462006927449017);
 
     enum Fruit { apple, mango, pear }
-    version (X86_64) // Issue 15147
+    version (X86_64) // https://issues.dlang.org/show_bug.cgi?id=15147
     assert(rnd.uniform!Fruit == Fruit.mango);
 }
 
@@ -2627,7 +2632,7 @@ auto ref choice(Range)(auto ref Range range)
     auto rnd = MinstdRand0(42);
 
     auto elem  = [1, 2, 3, 4, 5].choice(rnd);
-    version (X86_64) // Issue 15147
+    version (X86_64) // https://issues.dlang.org/show_bug.cgi?id=15147
     assert(elem == 3);
 }
 
@@ -2709,7 +2714,7 @@ if (isRandomAccessRange!Range)
     auto rnd = MinstdRand0(42);
 
     auto arr = [1, 2, 3, 4, 5].randomShuffle(rnd);
-    version (X86_64) // Issue 15147
+    version (X86_64) // https://issues.dlang.org/show_bug.cgi?id=15147
     assert(arr == [3, 5, 2, 4, 1]);
 }
 
@@ -2736,13 +2741,15 @@ if (isRandomAccessRange!Range)
     auto gen1 = Xorshift(123_456_789);
     auto gen2 = gen1.save();
     sa[] = sb[];
-    // Issue 19156 - @nogc std.random.randomShuffle.
+    // @nogc std.random.randomShuffle.
+    // https://issues.dlang.org/show_bug.cgi?id=19156
     () @nogc nothrow pure { randomShuffle(sa[], gen1); }();
     partialShuffle(sb[], sb.length, gen2);
     assert(sa[] == sb[]);
 }
 
-@safe unittest // bugzilla 18501
+// https://issues.dlang.org/show_bug.cgi?id=18501
+@safe unittest
 {
     import std.algorithm.comparison : among;
     auto r = randomShuffle([0,1]);
@@ -2797,15 +2804,15 @@ if (isRandomAccessRange!Range)
     auto arr = [1, 2, 3, 4, 5, 6];
     arr = arr.dup.partialShuffle(1, rnd);
 
-    version (X86_64) // Issue 15147
+    version (X86_64) // https://issues.dlang.org/show_bug.cgi?id=15147
     assert(arr == [2, 1, 3, 4, 5, 6]); // 1<->2
 
     arr = arr.dup.partialShuffle(2, rnd);
-    version (X86_64) // Issue 15147
+    version (X86_64) // https://issues.dlang.org/show_bug.cgi?id=15147
     assert(arr == [1, 4, 3, 2, 5, 6]); // 1<->2, 2<->4
 
     arr = arr.dup.partialShuffle(3, rnd);
-    version (X86_64) // Issue 15147
+    version (X86_64) // https://issues.dlang.org/show_bug.cgi?id=15147
     assert(arr == [5, 4, 6, 2, 1, 3]); // 1<->5, 2<->4, 3<->6
 }
 
@@ -3211,7 +3218,7 @@ if (isRandomAccessRange!Range)
     import std.range : iota;
     auto rnd = MinstdRand0(42);
 
-    version (X86_64) // Issue 15147
+    version (X86_64) // https://issues.dlang.org/show_bug.cgi?id=15147
     assert(10.iota.randomCover(rnd).equal([7, 4, 2, 0, 1, 6, 8, 3, 9, 5]));
 }
 
@@ -3225,7 +3232,8 @@ if (isRandomAccessRange!Range)
 
 @nogc nothrow pure @safe unittest
 {
-    // Issue 14001 - Optionally @nogc std.random.randomCover
+    // Optionally @nogc std.random.randomCover
+    // https://issues.dlang.org/show_bug.cgi?id=14001
     auto rng = Xorshift(123_456_789);
     int[5] sa = [1, 2, 3, 4, 5];
     auto r = randomCover(sa[], rng);
@@ -3277,13 +3285,13 @@ if (isRandomAccessRange!Range)
 
 @safe unittest
 {
-    // Bugzilla 12589
+    // https://issues.dlang.org/show_bug.cgi?id=12589
     int[] r = [];
     auto rc = randomCover(r);
     assert(rc.length == 0);
     assert(rc.empty);
 
-    // Bugzilla 16724
+    // https://issues.dlang.org/show_bug.cgi?id=16724
     import std.range : iota;
     auto range = iota(10);
     auto randy = range.randomCover;
@@ -3805,7 +3813,8 @@ if (isInputRange!Range && hasLength!Range && isUniformRNG!UniformRNG)
     const(int)[] a = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ];
 
     foreach (UniformRNG; PseudoRngTypes)
-    (){ // avoid workaround optimizations for large functions @@@BUG@@@ 2396
+    (){ // avoid workaround optimizations for large functions
+        // https://issues.dlang.org/show_bug.cgi?id=2396
         auto rng = UniformRNG(1234);
         /* First test the most general case: randomSample of input range, with and
          * without a specified random number generator.
@@ -3989,7 +3998,7 @@ if (isInputRange!Range && hasLength!Range && isUniformRNG!UniformRNG)
             }
 
             /* Check that it also works if .index is called before .front.
-             * See: http://d.puremagic.com/issues/show_bug.cgi?id=10322
+             * See: https://issues.dlang.org/show_bug.cgi?id=10322
              */
             auto sample3 = randomSample(TestInputRange(), 654, 654_321);
             for (; !sample3.empty; sample3.popFront())
@@ -4097,11 +4106,12 @@ if (isInputRange!Range && hasLength!Range && isUniformRNG!UniformRNG)
         static if (isForwardRange!UniformRNG)
         {
             auto sample1 = randomSample(a, 5, rng);
-            auto sample2 = ((const ref typeof(sample1) a) => a.save)(sample1); // Issue 15853.
+            // https://issues.dlang.org/show_bug.cgi?id=15853
+            auto sample2 = ((const ref typeof(sample1) a) => a.save)(sample1);
             assert(sample1.array() == sample2.array());
         }
 
-        // Bugzilla 8314
+        // https://issues.dlang.org/show_bug.cgi?id=8314
         {
             auto sample(RandomGen)(uint seed) { return randomSample(a, 1, RandomGen(seed)).front; }
 
diff --git a/std/range/interfaces.d b/std/range/interfaces.d
index c57265c66fb..4f8eba73278 100644
--- a/std/range/interfaces.d
+++ b/std/range/interfaces.d
@@ -251,9 +251,9 @@ interface OutputRange(E) {
     void put(E);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=6973
 @safe unittest
 {
-    // 6973
     static assert(isOutputRange!(OutputRange!int, int));
 }
 
diff --git a/std/range/package.d b/std/range/package.d
index 10b0235ecf1..97976c09539 100644
--- a/std/range/package.d
+++ b/std/range/package.d
@@ -473,7 +473,7 @@ pure @safe nothrow @nogc unittest
     assert(equal(r, excepted[]));
 }
 
-// Issue 12662
+// https://issues.dlang.org/show_bug.cgi?id=12662
 pure @safe nothrow @nogc unittest
 {
     int[3] src = [1,2,3];
@@ -714,7 +714,7 @@ debug pure nothrow @system unittest
     scope (success) assert(passed);
     import core.exception : AssertError;
     //std.exception.assertThrown won't do because it can't infer nothrow
-    // @@@BUG@@@ 12647
+    // https://issues.dlang.org/show_bug.cgi?id=12647
     try
     {
         auto unused = testArr[].stride(0);
@@ -765,7 +765,7 @@ pure @safe nothrow unittest
     // assert(s2[$ .. $].empty);
     assert(s2[s2.opDollar .. s2.opDollar].empty);
 
-    // Test fix for Bug 5035
+    // Test fix for https://issues.dlang.org/show_bug.cgi?id=5035
     auto m = [1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]; // 3 rows, 4 columns
     auto col = stride(m, 4);
     assert(equal(col, [1, 1, 1]));
@@ -1323,7 +1323,8 @@ pure @safe nothrow unittest
         assert(c.moveAt(5) == 1);
     }
 
-    // Make sure bug 3311 is fixed.  ChainImpl should compile even if not all
+
+    // Make sure https://issues.dlang.org/show_bug.cgi?id=3311 is fixed.
     // elements are mutable.
     assert(equal(chain(iota(0, 3), iota(0, 3)), [0, 1, 2, 0, 1, 2]));
 
@@ -1343,7 +1344,8 @@ pure @safe nothrow unittest
     // pair of DummyRange types, in either order.
 
     foreach (DummyType1; AllDummyRanges)
-    (){ // workaround slow optimizations for large functions @@@BUG@@@ 2396
+    (){ // workaround slow optimizations for large functions
+        // https://issues.dlang.org/show_bug.cgi?id=2396
         DummyType1 dummy1;
         foreach (DummyType2; AllDummyRanges)
         {
@@ -1391,7 +1393,8 @@ pure @safe nothrow @nogc unittest
     assert(chain(a, b).empty);
 }
 
-pure @safe unittest // issue 18657
+// https://issues.dlang.org/show_bug.cgi?id=18657
+pure @safe unittest
 {
     import std.algorithm.comparison : equal;
     string s = "foo";
@@ -1657,7 +1660,8 @@ private struct ChooseResult(R1, R2)
         }
 }
 
-pure @safe unittest // issue 18657
+// https://issues.dlang.org/show_bug.cgi?id=18657
+pure @safe unittest
 {
     import std.algorithm.comparison : equal;
     string s = "foo";
@@ -1697,6 +1701,7 @@ pure @safe unittest // issue 18657
     choose(true, [0], R()).save;
     choose(true, R(), [0]).save;
 }
+
 @safe unittest // copy is @system
 {
     static struct R
@@ -1711,6 +1716,7 @@ pure @safe unittest // issue 18657
     static assert(!__traits(compiles, choose(true, [0], R()).save));
     static assert(!__traits(compiles, choose(true, R(), [0]).save));
 }
+
 @system unittest // .save is @system
 {
     static struct R
@@ -1724,6 +1730,7 @@ pure @safe unittest // issue 18657
     choose(true, [0], R()).save;
     choose(true, R(), [0]).save;
 }
+
 @safe unittest // .save is @system
 {
     static struct R
@@ -1737,6 +1744,7 @@ pure @safe unittest // issue 18657
     static assert(!__traits(compiles, choose(true, [0], R()).save));
     static assert(!__traits(compiles, choose(true, R(), [0]).save));
 }
+
 //https://issues.dlang.org/show_bug.cgi?id=19738
 @safe nothrow pure @nogc unittest
 {
@@ -1761,7 +1769,8 @@ pure @safe unittest // issue 18657
 }
 
 
-@safe unittest // issue 20495
+// https://issues.dlang.org/show_bug.cgi?id=20495
+@safe unittest
 {
     static struct KillableRange
     {
@@ -2278,7 +2287,8 @@ if (isInputRange!(Unqual!Range) &&
             assert(!empty,
                 "Attempting to assign to the front of an empty "
                 ~ Take.stringof);
-            // This has to return auto instead of void because of Bug 4706.
+            // This has to return auto instead of void because of
+            // https://issues.dlang.org/show_bug.cgi?id=4706
             source.front = v;
         }
 
@@ -2363,7 +2373,8 @@ if (isInputRange!(Unqual!Range) &&
             /// ditto
             @property void back(ElementType!R v)
             {
-                // This has to return auto instead of void because of Bug 4706.
+                // This has to return auto instead of void because of
+                // https://issues.dlang.org/show_bug.cgi?id=4706
                 assert(!empty,
                     "Attempting to assign to the back of an empty "
                     ~ Take.stringof);
@@ -2528,7 +2539,8 @@ pure @safe nothrow @nogc unittest
 {
     // Check that one can declare variables of all Take types,
     // and that they match the return type of the corresponding
-    // take().  (See issue 4464.)
+    // take().
+    // See https://issues.dlang.org/show_bug.cgi?id=4464
     int[] r1;
     Take!(int[]) t1;
     t1 = take(r1, 1);
@@ -2554,7 +2566,8 @@ pure @safe nothrow @nogc unittest
     static assert(isBidirectionalRange!TR2);
 }
 
-pure @safe nothrow @nogc unittest //12731
+// https://issues.dlang.org/show_bug.cgi?id=12731
+pure @safe nothrow @nogc unittest
 {
     auto a = repeat(1);
     auto s = a[1 .. 5];
@@ -2564,7 +2577,8 @@ pure @safe nothrow @nogc unittest //12731
     assert(s[1] == 1);
 }
 
-pure @safe nothrow @nogc unittest //13151
+// https://issues.dlang.org/show_bug.cgi?id=13151
+pure @safe nothrow @nogc unittest
 {
     import std.algorithm.comparison : equal;
 
@@ -2987,7 +3001,7 @@ pure @safe nothrow @nogc unittest
     assertThrown!AssertError(s.popBack);
 }
 
-//guards against issue 16999
+// https://issues.dlang.org/show_bug.cgi?id=16999
 pure @safe unittest
 {
     auto myIota = new class
@@ -3046,7 +3060,7 @@ if (isInputRange!R)
     //member version if it's defined.
     static if (is(typeof(R.takeNone)))
         auto retval = range.takeNone();
-    //@@@BUG@@@ 8339
+    // https://issues.dlang.org/show_bug.cgi?id=8339
     else static if (isDynamicArray!R)/+ ||
                    (is(R == struct) && __traits(compiles, {auto r = R.init;}) && R.init.empty))+/
     {
@@ -3058,7 +3072,8 @@ if (isInputRange!R)
     else
         auto retval = takeExactly(range, 0);
 
-    //@@@BUG@@@ 7892 prevents this from being done in an out block.
+    // https://issues.dlang.org/show_bug.cgi?id=7892 prevents this from being
+    // done in an out block.
     assert(retval.empty);
     return retval;
 }
@@ -3159,8 +3174,8 @@ pure @safe nothrow unittest
                              "hello world"w,
                              "hello world"d,
                              SliceStruct([1, 2, 3]),
-                             //@@@BUG@@@ 8339 forces this to be takeExactly
-                             //`InitStruct([1, 2, 3]),
+                             // https://issues.dlang.org/show_bug.cgi?id=8339
+                             // forces this to be takeExactly `InitStruct([1, 2, 3]),
                              TakeNoneStruct([1, 2, 3])))
     {
         static assert(takeNone(range).empty, typeof(range).stringof);
@@ -3191,7 +3206,8 @@ pure @safe nothrow unittest
 
     auto filtered = filter!"true"([1, 2, 3, 4, 5]);
     assert(takeNone(filtered).empty);
-    //@@@BUG@@@ 8339 and 5941 force this to be takeExactly
+    // https://issues.dlang.org/show_bug.cgi?id=8339 and
+    // https://issues.dlang.org/show_bug.cgi?id=5941 force this to be takeExactly
     //static assert(is(typeof(filtered) == typeof(takeNone(filtered))), typeof(filtered).stringof);
 }
 
@@ -3271,7 +3287,7 @@ pure @safe nothrow unittest
         .assumeWontThrow);
 }
 
-// @nogc prevented by @@@BUG@@@ 15408
+// @nogc prevented by https://issues.dlang.org/show_bug.cgi?id=15408
 pure nothrow @safe /+@nogc+/ unittest
 {
     import std.algorithm.comparison : equal;
@@ -3624,7 +3640,8 @@ pure @safe nothrow unittest
     assert(5.repeat(4).equal([5, 5, 5, 5]));
 }
 
-pure @safe nothrow unittest //12007
+// https://issues.dlang.org/show_bug.cgi?id=12007
+pure @safe nothrow unittest
 {
     static class C{}
     Repeat!(immutable int) ri;
@@ -4288,7 +4305,8 @@ if (isStaticArray!R)
     assert(cleS.front == 0);
 }
 
-@system unittest //10845
+// https://issues.dlang.org/show_bug.cgi?id=10845
+@system unittest
 {
     import std.algorithm.comparison : equal;
     import std.algorithm.iteration : filter;
@@ -4297,12 +4315,13 @@ if (isStaticArray!R)
     assert(equal(cycle(a).take(10), [0, 1, 2, 0, 1, 2, 0, 1, 2, 0]));
 }
 
-@safe unittest // 12177
+// https://issues.dlang.org/show_bug.cgi?id=12177
+@safe unittest
 {
     static assert(__traits(compiles, recurrence!q{a[n - 1] ~ a[n - 2]}("1", "0")));
 }
 
-// Issue 13390
+// https://issues.dlang.org/show_bug.cgi?id=13390
 @system unittest
 {
     import core.exception : AssertError;
@@ -4310,7 +4329,8 @@ if (isStaticArray!R)
     assertThrown!AssertError(cycle([0, 1, 2][0 .. 0]));
 }
 
-pure @safe unittest // issue 18657
+// https://issues.dlang.org/show_bug.cgi?id=18657
+pure @safe unittest
 {
     import std.algorithm.comparison : equal;
     string s = "foo";
@@ -5242,11 +5262,12 @@ pure @system unittest
         assert(zLongest.empty);
     }
 
-    // BUG 8900
+    // https://issues.dlang.org/show_bug.cgi?id=8900
     assert(zip([1, 2], repeat('a')).array == [tuple(1, 'a'), tuple(2, 'a')]);
     assert(zip(repeat('a'), [1, 2]).array == [tuple('a', 1), tuple('a', 2)]);
 
-    // Issue 18524 - moveBack instead performs moveFront
+    // https://issues.dlang.org/show_bug.cgi?id=18524
+    // moveBack instead performs moveFront
     {
         auto r = zip([1,2,3]);
         assert(r.moveBack()[0] == 3);
@@ -5320,7 +5341,7 @@ nothrow pure @safe unittest
     assert(equal(z2, [tuple(7, 0L)]));
 }
 
-// Text for Issue 11196
+// Test for https://issues.dlang.org/show_bug.cgi?id=11196
 @safe pure unittest
 {
     import std.exception : assertThrown;
@@ -5331,7 +5352,8 @@ nothrow pure @safe unittest
     assertThrown(zip(StoppingPolicy.longest, cast(S[]) null, new int[1]).front);
 }
 
-@nogc nothrow @safe pure unittest //12007
+// https://issues.dlang.org/show_bug.cgi?id=12007
+@nogc nothrow @safe pure unittest
 {
     static struct R
     {
@@ -5643,7 +5665,8 @@ if (allSatisfy!(isInputRange, Ranges))
    }
 }
 
-@system unittest // Bugzilla 15860: foreach_reverse on lockstep
+// https://issues.dlang.org/show_bug.cgi?id=15860: foreach_reverse on lockstep
+@system unittest
 {
     auto arr1 = [0, 1, 2, 3];
     auto arr2 = [4, 5, 6, 7];
@@ -5725,8 +5748,9 @@ if (allSatisfy!(isInputRange, Ranges))
         assert(0);
     } catch (Exception) {}
 
-    // Just make sure 1-range case instantiates.  This hangs the compiler
-    // when no explicit stopping policy is specified due to Bug 4652.
+    // Just make sure 1-range case instantiates. This hangs the compiler
+    // when no explicit stopping policy is specified due to
+    // https://issues.dlang.org/show_bug.cgi?id=4652
     auto stuff = lockstep([1,2,3,4,5], StoppingPolicy.shortest);
     foreach (i, a; stuff)
     {
@@ -6130,7 +6154,7 @@ pure @safe nothrow @nogc unittest
     assert(equal(odds.take(3), only(21, 23, 25)));
 }
 
-// Issue 5036
+// https://issues.dlang.org/show_bug.cgi?id=5036
 pure @safe nothrow unittest
 {
     auto s = sequence!((a, n) => new int)(0);
@@ -6649,14 +6673,15 @@ pure @safe unittest
     assert(iota_of_longs_with_steps.length == 6);
     assert(equal(iota_of_longs_with_steps, [50L, 60L, 70L, 80L, 90L, 100L]));
 
-    // iota of unsigned zero length (issue 6222, actually trying to consume it
-    // is the only way to find something is wrong because the public
-    // properties are all correct)
+    // iota of unsigned zero length (https://issues.dlang.org/show_bug.cgi?id=6222)
+    // Actually trying to consume it is the only way to find something is wrong
+    // because the public properties are all correct.
     auto iota_zero_unsigned = iota(0, 0u, 3);
     assert(count(iota_zero_unsigned) == 0);
 
-    // unsigned reverse iota can be buggy if .length doesn't take them into
-    // account (issue 7982).
+    // https://issues.dlang.org/show_bug.cgi?id=7982
+    // unsigned reverse iota can be buggy if `.length` doesn't
+    // take them into account
     assert(iota(10u, 0u, -1).length == 10);
     assert(iota(10u, 0u, -2).length == 5);
     assert(iota(uint.max, uint.max-10, -1).length == 10);
@@ -6672,7 +6697,7 @@ pure @safe unittest
     assert(!(int.max in iota(20u, 10u, -1)));
 
 
-    // Issue 8920
+    // https://issues.dlang.org/show_bug.cgi?id=8920
     static foreach (Type; AliasSeq!(byte, ubyte, short, ushort,
         int, uint, long, ulong))
     {{
@@ -7175,7 +7200,7 @@ pure @safe nothrow unittest
     }
 }
 
-// Issue 16363
+// https://issues.dlang.org/show_bug.cgi?id=16363
 pure @safe nothrow unittest
 {
     import std.algorithm.comparison : equal;
@@ -7187,7 +7212,7 @@ pure @safe nothrow unittest
     static assert(isRandomAccessRange!(typeof(ft)));
 }
 
-// Bugzilla 16442
+// https://issues.dlang.org/show_bug.cgi?id=16442
 pure @safe nothrow unittest
 {
     int[][] arr = [[], []];
@@ -7601,7 +7626,7 @@ private:
     assert(transposed(ror).empty);
 }
 
-// Issue 9507
+// https://issues.dlang.org/show_bug.cgi?id=9507
 @safe unittest
 {
     import std.algorithm.comparison : equal;
@@ -7613,7 +7638,7 @@ private:
     ]));
 }
 
-// Issue 17742
+// https://issues.dlang.org/show_bug.cgi?id=17742
 @safe unittest
 {
     import std.algorithm.iteration : map;
@@ -7706,7 +7731,7 @@ if (isForwardRange!RangeOfRanges &&
     }
 }
 
-// Issue 8764
+// https://issues.dlang.org/show_bug.cgi?id=8764
 @safe unittest
 {
     import std.algorithm.comparison : equal;
@@ -9800,7 +9825,7 @@ private struct OnlyResult(T, size_t arity)
     private size_t frontIndex = 0;
     private size_t backIndex = 0;
 
-    // @@@BUG@@@ 10643
+    // https://issues.dlang.org/show_bug.cgi?id=10643
     version (none)
     {
         import std.traits : hasElaborateAssign;
@@ -10035,7 +10060,7 @@ if (!is(CommonType!Values == void) || Values.length == 0)
     assert(imm.front == 1);
     assert(imm.back == 1);
     assert(!imm.empty);
-    assert(imm.init.empty); // Issue 13441
+    assert(imm.init.empty); // https://issues.dlang.org/show_bug.cgi?id=13441
     assert(imm.length == 1);
     assert(equal(imm, imm[]));
     assert(equal(imm, imm[0 .. 1]));
@@ -10124,7 +10149,7 @@ if (!is(CommonType!Values == void) || Values.length == 0)
     alias Imm = typeof(imm);
     static assert(is(ElementType!Imm == immutable(int)));
     assert(!imm.empty);
-    assert(imm.init.empty); // Issue 13441
+    assert(imm.init.empty); // https://issues.dlang.org/show_bug.cgi?id=13441
     assert(imm.front == 42);
     imm.popFront();
     assert(imm.front == 24);
@@ -10464,7 +10489,8 @@ pure @safe unittest
     }}
 }
 
-version (none) // @@@BUG@@@ 10939
+// https://issues.dlang.org/show_bug.cgi?id=10939
+version (none)
 {
     // Re-enable (or remove) if 10939 is resolved.
     /+pure+/ @safe unittest // Impure because of std.conv.to
@@ -11144,7 +11170,7 @@ template SortedRange(Range, alias pred = "a < b",
                      SortedRangeOptions opt = SortedRangeOptions.assumeSorted)
 if (isInstanceOf!(SortedRange, Range))
 {
-    // Avoid nesting SortedRange types (see Issue 18933);
+    // Avoid nesting SortedRange types (see https://issues.dlang.org/show_bug.cgi?id=18933);
     alias SortedRange = SortedRange!(Unqual!(typeof(Range._input)), pred, opt);
 }
 
@@ -11374,7 +11400,8 @@ if (isInputRange!(Unqual!R))
     p = assumeSorted(a).upperBound(4.2);
     assert(equal(p, [ 5, 6 ]));
 
-    // Issue 18933 - don't create senselessly nested SortedRange types.
+    // https://issues.dlang.org/show_bug.cgi?id=18933
+    // don't create senselessly nested SortedRange types.
     assert(is(typeof(assumeSorted(a)) == typeof(assumeSorted(assumeSorted(a)))));
     assert(is(typeof(assumeSorted(a)) == typeof(assumeSorted(assumeSorted!"a > b"(a)))));
 }
@@ -11420,7 +11447,7 @@ if (isInputRange!(Unqual!R))
     r = assumeSorted(a);
 }
 
-// issue 15003
+// https://issues.dlang.org/show_bug.cgi?id=15003
 @nogc @safe unittest
 {
     static immutable a = [1, 2, 3, 4];
@@ -11944,8 +11971,8 @@ private:
     }
 
     {
-        // Issue 16534 - opDollar should be defined if the
-        // wrapped range defines length.
+        // https://issues.dlang.org/show_bug.cgi?id=16534
+        // opDollar should be defined if the wrapped range defines length.
         auto range = 10.iota.takeExactly(5);
         auto wrapper = refRange(&range);
         assert(wrapper.length == 5);
@@ -12133,7 +12160,8 @@ private:
     assert(cWrapper is c);
 }
 
-@system unittest // issue 14373
+// https://issues.dlang.org/show_bug.cgi?id=14373
+@system unittest
 {
     static struct R
     {
@@ -12146,7 +12174,8 @@ private:
     assert(r.empty);
 }
 
-@system unittest // issue 14575
+// https://issues.dlang.org/show_bug.cgi?id=14575
+@system unittest
 {
     struct R
     {
@@ -12186,9 +12215,8 @@ if (isInputRange!R)
         return *range;
 }
 
-/*****************************************************************************/
-
-@safe unittest    // bug 9060
+// https://issues.dlang.org/show_bug.cgi?id=9060
+@safe unittest
 {
     import std.algorithm.iteration : map, joiner, group;
     import std.algorithm.searching : until;
@@ -13032,9 +13060,9 @@ if (is(typeof(fun) == void) || isSomeFunction!fun)
     }}
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=13483
 @safe unittest
 {
-    // Issue 13483
     static void func1(T)(T x) {}
     void func2(int x) {}
 
@@ -13428,7 +13456,7 @@ pure @safe unittest
     assert(len == 6);
 }
 
-// Issue 19042
+// https://issues.dlang.org/show_bug.cgi?id=19042
 @safe pure unittest
 {
     import std.algorithm.comparison : equal;
diff --git a/std/range/primitives.d b/std/range/primitives.d
index 6179858c7ad..6006c1ee896 100644
--- a/std/range/primitives.d
+++ b/std/range/primitives.d
@@ -512,7 +512,7 @@ void put(R, E)(ref R r, E e)
 private void putChar(R, E)(ref R r, E e)
 if (isSomeChar!E)
 {
-    ////@@@9186@@@: Can't use (E[]).init
+    // https://issues.dlang.org/show_bug.cgi?id=9186: Can't use (E[]).init
     ref const( char)[] cstringInit();
     ref const(wchar)[] wstringInit();
     ref const(dchar)[] dstringInit();
@@ -802,18 +802,18 @@ pure @safe unittest
     put(c, "hello"d);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=9823
 @system unittest
 {
-    // issue 9823
     const(char)[] r;
     void delegate(const(char)[]) dg = (s) { r = s; };
     put(dg, ["ABC"]);
     assert(r == "ABC");
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=10571
 @safe unittest
 {
-    // issue 10571
     import std.format;
     string buf;
     formattedWrite((scope const(char)[] s) { buf ~= s; }, "%s", "hello");
@@ -1319,7 +1319,8 @@ template ElementType(R)
     static assert(is(ElementType!(char[0]) == dchar));
 }
 
-@safe unittest //11336
+// https://issues.dlang.org/show_bug.cgi?id=11336
+@safe unittest
 {
     static struct S
     {
@@ -1328,7 +1329,8 @@ template ElementType(R)
     static assert(is(ElementType!(S[]) == S));
 }
 
-@safe unittest // 11401
+// https://issues.dlang.org/show_bug.cgi?id=11401
+@safe unittest
 {
     // ElementType should also work for non-@propety 'front'
     struct E { ushort id; }
@@ -2323,7 +2325,8 @@ if (isAutodecodableString!(C[]) && !isAggregateType!(C[]))
     static assert(checkCTFEW.empty);
 }
 
-@safe unittest // issue 16090
+// https://issues.dlang.org/show_bug.cgi?id=16090
+@safe unittest
 {
     string s = "\u00E4";
     assert(s.length == 2);
diff --git a/std/regex/internal/ir.d b/std/regex/internal/ir.d
index 4a5b790d0a5..856a268c663 100644
--- a/std/regex/internal/ir.d
+++ b/std/regex/internal/ir.d
@@ -30,7 +30,9 @@ CharMatcher[CodepointSet] matcherCache;
 
 //accessor with caching
 @trusted CharMatcher getMatcher(CodepointSet set)
-{// @@@BUG@@@ 6357 almost all properties of AA are not @safe
+{
+    // almost all properties of AA are not @safe
+    // https://issues.dlang.org/show_bug.cgi?id=6357
     if (__ctfe || maxCachedMatchers == 0)
         return CharMatcher(set);
     else
@@ -251,8 +253,8 @@ struct Bytecode
         return t;
     }
 
-    //bit twiddling helpers
-    //0-arg template due to @@@BUG@@@ 10985
+    // bit twiddling helpers
+    // 0-arg template due to https://issues.dlang.org/show_bug.cgi?id=10985
     @property uint data()() const { return raw & 0x003f_ffff; }
 
     @property void data()(uint val)
@@ -260,12 +262,12 @@ struct Bytecode
         raw = (raw & ~0x003f_ffff) | (val & 0x003f_ffff);
     }
 
-    //ditto
-    //0-arg template due to @@@BUG@@@ 10985
+    // ditto
+    // 0-arg template due to https://issues.dlang.org/show_bug.cgi?id=10985
     @property uint sequence()() const { return 2 + (raw >> 22 & 0x3); }
 
-    //ditto
-    //0-arg template due to @@@BUG@@@ 10985
+    // ditto
+    // 0-arg template due to https://issues.dlang.org/show_bug.cgi?id=10985
     @property IR code()() const { return cast(IR)(raw >> 24); }
 
     //ditto
@@ -876,16 +878,15 @@ template BackLooper(E)
     return dict[fnd].group;
 }
 
-//whether ch is one of unicode newline sequences
-//0-arg template due to @@@BUG@@@ 10985
+// whether ch is one of unicode newline sequences
+// 0-arg template due to https://issues.dlang.org/show_bug.cgi?id=10985
 bool endOfLine()(dchar front, bool seenCr)
 {
     return ((front == '\n') ^ seenCr) || front == '\r'
     || front == NEL || front == LS || front == PS;
 }
 
-//
-//0-arg template due to @@@BUG@@@ 10985
+// 0-arg template due to https://issues.dlang.org/show_bug.cgi?id=10985
 bool startOfLine()(dchar back, bool seenNl)
 {
     return ((back == '\r') ^ seenNl) || back == '\n'
@@ -1154,4 +1155,4 @@ if (!hasElaborateDestructor!T)
         a = a;
         assert(a.big.refcount == 2); // a & c
     }
-}
\ No newline at end of file
+}
diff --git a/std/regex/internal/tests2.d b/std/regex/internal/tests2.d
index 1bba66e90b3..01f8b0a255a 100644
--- a/std/regex/internal/tests2.d
+++ b/std/regex/internal/tests2.d
@@ -149,7 +149,7 @@ import std.uni : Escapables; // characters that need escaping
     import std.algorithm.iteration : map;
     void test_body(alias matchFn)()
     {
-        //issue 5857
+        // https://issues.dlang.org/show_bug.cgi?id=5857
         //matching goes out of control if ... in (...){x} has .*/.+
         auto c = matchFn("axxxzayyyyyzd",regex("(a.*z){2}d")).captures;
         assert(c[0] == "axxxzayyyyyzd");
@@ -157,7 +157,7 @@ import std.uni : Escapables; // characters that need escaping
         auto c2 = matchFn("axxxayyyyyd",regex("(a.*){2}d")).captures;
         assert(c2[0] == "axxxayyyyyd");
         assert(c2[1] == "ayyyyy");
-        //issue 2108
+        // https://issues.dlang.org/show_bug.cgi?id=2108
         //greedy vs non-greedy
         auto nogreed = regex("<packet.*?/packet>");
         assert(matchFn("<packet>text</packet><packet>text</packet>", nogreed).hit
@@ -165,7 +165,7 @@ import std.uni : Escapables; // characters that need escaping
         auto greed =  regex("<packet.*/packet>");
         assert(matchFn("<packet>text</packet><packet>text</packet>", greed).hit
                == "<packet>text</packet><packet>text</packet>");
-        //issue 4574
+        // https://issues.dlang.org/show_bug.cgi?id=4574
         //empty successful match still advances the input
         string[] pres, posts, hits;
         foreach (m; matchFn("abcabc", regex("","g")))
@@ -195,7 +195,7 @@ import std.uni : Escapables; // characters that need escaping
         ];
         assert(pres == array(retro(heads)));
         assert(posts == tails);
-        //issue 6076
+        // https://issues.dlang.org/show_bug.cgi?id=6076
         //regression on .*
         auto re = regex("c.*|d");
         auto m = matchFn("mm", re);
@@ -214,7 +214,7 @@ import std.uni : Escapables; // characters that need escaping
             assert(!match(to!string(ch),regex(`[^\`~ch~`]`)));
             assert(match(to!string(ch),regex(`[\`~ch~`-\`~ch~`]`)));
         }
-        //bugzilla 7718
+        // https://issues.dlang.org/show_bug.cgi?id=7718
         string strcmd = "./myApp.rb -os OSX -path \"/GIT/Ruby Apps/sec\" -conf 'notimer'";
         auto reStrCmd = regex (`(".*")|('.*')`, "g");
         assert(equal(map!"a[0]"(matchFn(strcmd, reStrCmd)),
@@ -293,24 +293,29 @@ import std.uni : Escapables; // characters that need escaping
     assert(equal(split(s1, regex(", *")), w1[]));
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=7141
 @safe unittest
-{ // bugzilla 7141
+{
     string pattern = `[a\--b]`;
     assert(match("-", pattern));
     assert(match("b", pattern));
     string pattern2 = `[&-z]`;
     assert(match("b", pattern2));
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=7111
 @safe unittest
-{//bugzilla 7111
+{
     assert(match("", regex("^")));
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=7300
 @safe unittest
-{//bugzilla 7300
+{
     assert(!match("a"d, "aa"d));
 }
 
-// bugzilla 7551
+// https://issues.dlang.org/show_bug.cgi?id=7551
 @safe unittest
 {
     auto r = regex("[]abc]*");
@@ -320,14 +325,17 @@ import std.uni : Escapables; // characters that need escaping
     assert("]ac".matchFirst(r2).hit == "]");
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=7674
 @safe unittest
-{//bugzilla 7674
+{
     assert("1234".replace(regex("^"), "$$") == "$1234");
     assert("hello?".replace(regex(r"\?", "g"), r"\?") == r"hello\?");
     assert("hello?".replace(regex(r"\?", "g"), r"\\?") != r"hello\?");
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=7679
 @safe unittest
-{// bugzilla 7679
+{
     import std.algorithm.comparison : equal;
     static foreach (S; AliasSeq!(string, wstring, dstring))
     {{
@@ -337,8 +345,10 @@ import std.uni : Escapables; // characters that need escaping
         assert(split(str, re) == [to!S("a"), to!S("b")]);
     }}
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=8203
 @safe unittest
-{//bugzilla 8203
+{
     string data = "
     NAME   = XPAW01_STA:STATION
     NAME   = XPAW01_STA
@@ -353,13 +363,15 @@ import std.uni : Escapables; // characters that need escaping
     auto r2 = regex(`([а-яА-Я\-_]+\s*)+(?<=[\s\.,\^])`);
     match("аллея Театральная", r2);
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=8637 purity of enforce
 @safe unittest
-{// bugzilla 8637 purity of enforce
+{
     auto m = match("hello world", regex("world"));
     enforce(m);
 }
 
-// bugzilla 8725
+// https://issues.dlang.org/show_bug.cgi?id=8725
 @safe unittest
 {
   static italic = regex( r"\*
@@ -372,7 +384,7 @@ import std.uni : Escapables; // characters that need escaping
       "this * is* interesting, <i>very</i> interesting");
 }
 
-// bugzilla 8349
+// https://issues.dlang.org/show_bug.cgi?id=8349
 @safe unittest
 {
     enum peakRegexStr = r"\>(wgEncode.*Tfbs.*\.(?:narrow)|(?:broad)Peak.gz)</a>";
@@ -381,7 +393,7 @@ import std.uni : Escapables; // characters that need escaping
     assert(match(r"\>wgEncode-blah-Tfbs.narrow</a>", peakRegex));
 }
 
-// bugzilla 9211
+// https://issues.dlang.org/show_bug.cgi?id=9211
 @safe unittest
 {
     import std.algorithm.comparison : equal;
@@ -393,7 +405,7 @@ import std.uni : Escapables; // characters that need escaping
     assert(equal(m2.front, ["1234", "3", "4"]));
 }
 
-// bugzilla 9280
+// https://issues.dlang.org/show_bug.cgi?id=9280
 @safe unittest
 {
     string tomatch = "a!b@c";
@@ -406,7 +418,7 @@ import std.uni : Escapables; // characters that need escaping
 }
 
 
-// bugzilla 9579
+// https://issues.dlang.org/show_bug.cgi?id=9579
 @safe unittest
 {
     char[] input = ['a', 'b', 'c'];
@@ -417,14 +429,14 @@ import std.uni : Escapables; // characters that need escaping
     assert(r == "(a)bc");
 }
 
-// bugzilla 9634
+// https://issues.dlang.org/show_bug.cgi?id=9634
 @safe unittest
 {
     auto re = ctRegex!"(?:a+)";
     assert(match("aaaa", re).hit == "aaaa");
 }
 
-//bugzilla 10798
+// https://issues.dlang.org/show_bug.cgi?id=10798
 @safe unittest
 {
     auto cr = ctRegex!("[abcd--c]*");
@@ -433,7 +445,7 @@ import std.uni : Escapables; // characters that need escaping
     assert(m.hit == "ab");
 }
 
-// bugzilla 10913
+// https://issues.dlang.org/show_bug.cgi?id=10913
 @system unittest
 {
     @system static string foo(const(char)[] s)
@@ -452,7 +464,7 @@ import std.uni : Escapables; // characters that need escaping
     }();
 }
 
-// bugzilla 11262
+// https://issues.dlang.org/show_bug.cgi?id=11262
 @safe unittest
 {
     enum reg = ctRegex!(r",", "g");
@@ -461,13 +473,13 @@ import std.uni : Escapables; // characters that need escaping
     assert(str == "This-List");
 }
 
-// bugzilla 11775
+// https://issues.dlang.org/show_bug.cgi?id=11775
 @safe unittest
 {
     assert(collectException(regex("a{1,0}")));
 }
 
-// bugzilla 11839
+// https://issues.dlang.org/show_bug.cgi?id=11839
 @safe unittest
 {
     import std.algorithm.comparison : equal;
@@ -478,7 +490,7 @@ import std.uni : Escapables; // characters that need escaping
     assert(regex(`(?P<я>\w+)`).namedCaptures.equal(["я"]));
 }
 
-// bugzilla 12076
+// https://issues.dlang.org/show_bug.cgi?id=12076
 @safe unittest
 {
     auto RE = ctRegex!(r"(?<!x[a-z]+)\s([a-z]+)");
@@ -486,7 +498,7 @@ import std.uni : Escapables; // characters that need escaping
     auto m = match(s, RE);
 }
 
-// bugzilla 12105
+// https://issues.dlang.org/show_bug.cgi?id=12105
 @safe unittest
 {
     auto r = ctRegex!`.*?(?!a)`;
@@ -495,14 +507,14 @@ import std.uni : Escapables; // characters that need escaping
     assert("aaab".matchFirst(r2).hit == "aaab");
 }
 
-//bugzilla 11784
+// https://issues.dlang.org/show_bug.cgi?id=11784
 @safe unittest
 {
     assert("abcdefghijklmnopqrstuvwxyz"
         .matchFirst("[a-z&&[^aeiuo]]").hit == "b");
 }
 
-//bugzilla 12366
+// https://issues.dlang.org/show_bug.cgi?id=12366
 @safe unittest
 {
      auto re = ctRegex!(`^((?=(xx+?)\2+$)((?=\2+$)(?=(x+)(\4+$))\5){2})*x?$`);
@@ -510,27 +522,27 @@ import std.uni : Escapables; // characters that need escaping
      assert(!"xxxx".match(re).empty);
 }
 
-// bugzilla 12582
+// https://issues.dlang.org/show_bug.cgi?id=12582
 @safe unittest
 {
     auto r = regex(`(?P<a>abc)`);
     assert(collectException("abc".matchFirst(r)["b"]));
 }
 
-// bugzilla 12691
+// https://issues.dlang.org/show_bug.cgi?id=12691
 @safe unittest
 {
     assert(bmatch("e@", "^([a-z]|)*$").empty);
     assert(bmatch("e@", ctRegex!`^([a-z]|)*$`).empty);
 }
 
-//bugzilla  12713
+// https://issues.dlang.org/show_bug.cgi?id=12713
 @safe unittest
 {
     assertThrown(regex("[[a-z]([a-z]|(([[a-z])))"));
 }
 
-//bugzilla 12747
+// https://issues.dlang.org/show_bug.cgi?id=12747
 @safe unittest
 {
     assertThrown(regex(`^x(\1)`));
@@ -538,7 +550,7 @@ import std.uni : Escapables; // characters that need escaping
     assertThrown(regex(`^((x)(?=\1))`));
 }
 
-// bugzilla 13532
+// https://issues.dlang.org/show_bug.cgi?id=13532
 version (none) // TODO: revist once we have proper benchmark framework
 @safe unittest
 {
@@ -568,14 +580,14 @@ version (none) // TODO: revist once we have proper benchmark framework
         "enum regex to static regex ratio "~to!string(ratio));
 }
 
-// bugzilla 14504
+// https://issues.dlang.org/show_bug.cgi?id=14504
 @safe unittest
 {
     auto p = ctRegex!("a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?" ~
             "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
 }
 
-// bugzilla 14529
+// https://issues.dlang.org/show_bug.cgi?id=14529
 @safe unittest
 {
     auto ctPat2 = regex(r"^[CDF]$", "i");
@@ -583,7 +595,7 @@ version (none) // TODO: revist once we have proper benchmark framework
         assert(matchAll(v, ctPat2).front.hit == v);
 }
 
-// bugzilla 14615
+// https://issues.dlang.org/show_bug.cgi?id=14615
 @safe unittest
 {
     import std.array : appender;
@@ -602,14 +614,14 @@ version (none) // TODO: revist once we have proper benchmark framework
     assert(sink.data == "Hello, world!Hello, world!");
 }
 
-// bugzilla 15573
+// https://issues.dlang.org/show_bug.cgi?id=15573
 @safe unittest
 {
     auto rx = regex("[c d]", "x");
     assert("a b".matchFirst(rx));
 }
 
-// bugzilla 15864
+// https://issues.dlang.org/show_bug.cgi?id=15864
 @safe unittest
 {
     regex(`(<a (?:(?:\w+=\"[^"]*\")?\s*)*href="\.\.?)"`);
@@ -622,7 +634,7 @@ version (none) // TODO: revist once we have proper benchmark framework
     assertThrown(regex("(?#..."));
 }
 
-// bugzilla 17075
+// https://issues.dlang.org/show_bug.cgi?id=17075
 @safe unittest
 {
     enum titlePattern = `<title>(.+)</title>`;
@@ -631,14 +643,14 @@ version (none) // TODO: revist once we have proper benchmark framework
     assert(input.matchFirst(titleRegex).empty);
 }
 
-// bugzilla 17212
+// https://issues.dlang.org/show_bug.cgi?id=17212
 @safe unittest
 {
     auto r = regex(" [a] ", "x");
     assert("a".matchFirst(r));
 }
 
-// bugzilla 17157
+// https://issues.dlang.org/show_bug.cgi?id=17157
 @safe unittest
 {
     import std.algorithm.comparison : equal;
@@ -655,7 +667,7 @@ version (none) // TODO: revist once we have proper benchmark framework
     assert(equal!equal(s.bmatch(r), outcomes));
 }
 
-// bugzilla 17667
+// https://issues.dlang.org/show_bug.cgi?id=17667
 @safe unittest
 {
     import std.algorithm.searching : canFind;
@@ -671,7 +683,7 @@ version (none) // TODO: revist once we have proper benchmark framework
     willThrow([r"\", r"123"], "invalid escape sequence");
 }
 
-// bugzilla 17668
+// https://issues.dlang.org/show_bug.cgi?id=17668
 @safe unittest
 {
     import std.algorithm.searching;
@@ -679,7 +691,7 @@ version (none) // TODO: revist once we have proper benchmark framework
     assert(e.msg.canFind("no operand for '^'"), e.msg);
 }
 
-// bugzilla 17673
+// https://issues.dlang.org/show_bug.cgi?id=17673
 @safe unittest
 {
     string str = `<">`;
@@ -690,7 +702,7 @@ version (none) // TODO: revist once we have proper benchmark framework
     assert(c.whichPattern == 2);
 }
 
-// bugzilla 18692
+// https://issues.dlang.org/show_bug.cgi?id=18692
 @safe unittest
 {
     auto rx = regex("()()()");
@@ -698,4 +710,4 @@ version (none) // TODO: revist once we have proper benchmark framework
     auto ma2 = ma;
     ma = ma2;
     assert(ma[1] == "");
-}
\ No newline at end of file
+}
diff --git a/std/regex/package.d b/std/regex/package.d
index 500e61ac8eb..0b99df72001 100644
--- a/std/regex/package.d
+++ b/std/regex/package.d
@@ -706,7 +706,8 @@ public:
         || cast(bool)(c = matchFirst(s, regex("a"))));
 }
 
-@system unittest // Issue 19979
+// https://issues.dlang.org/show_bug.cgi?id=19979
+@system unittest
 {
     auto c = matchFirst("bad", regex(`(^)(not )?bad($)`));
     assert(c[0] && c[0].length == "bad".length);
diff --git a/std/signals.d b/std/signals.d
index e26a8534444..23639eb7692 100644
--- a/std/signals.d
+++ b/std/signals.d
@@ -651,7 +651,7 @@ void linkin() { }
    a.emit(); // should not raise segfault since &o.watch2 is no longer connected
 }
 
-version (none) // Disabled because of dmd @@@BUG5028@@@
+version (none) // Disabled because of https://issues.dlang.org/show_bug.cgi?id=5028
 @system unittest
 {
     class A
diff --git a/std/socket.d b/std/socket.d
index 78732710342..49e40873794 100644
--- a/std/socket.d
+++ b/std/socket.d
@@ -2551,7 +2551,9 @@ public:
     });
 }
 
-@safe unittest // Issue 14012, 14013
+// https://issues.dlang.org/show_bug.cgi?id=14012
+// https://issues.dlang.org/show_bug.cgi?id=14013
+@safe unittest
 {
     auto set = new SocketSet(1);
     assert(set.max >= 0);
@@ -3592,7 +3594,7 @@ class UdpSocket: Socket
     }
 }
 
-// Issue 16514
+// https://issues.dlang.org/show_bug.cgi?id=16514
 @safe unittest
 {
     class TestSocket : Socket
diff --git a/std/stdio.d b/std/stdio.d
index a7cba90a90b..8af233ef493 100644
--- a/std/stdio.d
+++ b/std/stdio.d
@@ -489,7 +489,8 @@ file.
         return this;
     }
 
-    @safe unittest // bugzilla 20129
+     // https://issues.dlang.org/show_bug.cgi?id=20129
+    @safe unittest
     {
         File[int] aa;
         aa.require(0, File.init);
@@ -508,7 +509,8 @@ Throws: `ErrnoException` in case of error.
         resetFile(name, stdioOpenmode, false);
     }
 
-    @system unittest // bugzilla 20585
+    // https://issues.dlang.org/show_bug.cgi?id=20585
+    @system unittest
     {
         File f;
         try
@@ -850,7 +852,7 @@ the file handle.
 
     @safe unittest
     {
-        // Issue 12349
+        // https://issues.dlang.org/show_bug.cgi?id=12349
         static import std.file;
         auto deleteme = testFilename();
         auto f = File(deleteme, "w");
@@ -952,7 +954,7 @@ Throws: `Exception` if the file is not opened or if the call to `fflush` fails.
 
     @safe unittest
     {
-        // Issue 12349
+        // https://issues.dlang.org/show_bug.cgi?id=12349
         import std.exception : assertThrown;
         static import std.file;
 
@@ -1024,7 +1026,7 @@ Throws: `Exception` if `buffer` is empty.
             {
                 import core.atomic : atomicOp;
 
-                // @@@BUG@@@ 4243
+                // https://issues.dlang.org/show_bug.cgi?id=4243
                 immutable info = __fhnd_info[fd];
                 atomicOp!"&="(__fhnd_info[fd], ~FHND_TEXT);
                 scope(exit) __fhnd_info[fd] = info;
@@ -1080,7 +1082,7 @@ Throws: `ErrnoException` if the file is not opened or if the call to `fwrite` fa
             {
                 import core.atomic : atomicOp;
 
-                // @@@BUG@@@ 4243
+                // https://issues.dlang.org/show_bug.cgi?id=4243
                 immutable info = __fhnd_info[fd];
                 atomicOp!"&="(__fhnd_info[fd], ~FHND_TEXT);
                 scope(exit) __fhnd_info[fd] = info;
@@ -1847,7 +1849,8 @@ is recommended if you want to process a complete file.
         assert(buffer[beyond] == 'a');
     }
 
-    @system unittest // bugzilla 15293
+    // https://issues.dlang.org/show_bug.cgi?id=15293
+    @system unittest
     {
         // @system due to readln
         static import std.file;
@@ -2010,7 +2013,7 @@ $(CONSOLE
         f.readf("%s\n", &s);
         assert(s == "world", "["~s~"]");
 
-        // Issue 11698
+        // https://issues.dlang.org/show_bug.cgi?id=11698
         bool b1, b2;
         f.readf("%s\n%s\n", &b1, &b2);
         assert(b1 == true && b2 == false);
@@ -2031,13 +2034,14 @@ $(CONSOLE
         assert(s1 == "hello");
         assert(s2 == "world");
 
-        // Issue 11698
+        // https://issues.dlang.org/show_bug.cgi?id=11698
         bool b1, b2;
         f.readf("%s\n%s\n", &b1, b2);
         assert(b1 == true && b2 == false);
     }
 
-    // Issue 12260 - Nice error of std.stdio.readf with newlines
+    // Nice error of std.stdio.readf with newlines
+    // https://issues.dlang.org/show_bug.cgi?id=12260
     @system unittest
     {
         static import std.file;
@@ -2339,7 +2343,8 @@ the contents may well have changed).
         }}
     }
 
-    @system unittest // Issue 19980
+    // https://issues.dlang.org/show_bug.cgi?id=19980
+    @system unittest
     {
         static import std.file;
         auto deleteme = testFilename();
@@ -2530,7 +2535,7 @@ $(REF readText, std,file)
             }
             assert(i == witness.length, text(i, " != ", witness.length));
 
-            // Issue 11830
+            // https://issues.dlang.org/show_bug.cgi?id=11830
             auto walkedLength = File(deleteme).byLine(kt, term).walkLength;
             assert(walkedLength == witness.length, text(walkedLength, " != ", witness.length));
 
@@ -2590,7 +2595,7 @@ $(REF readText, std,file)
             auto file = File.tmpfile();
         file.write("1\n2\n3\n");
 
-        // bug 9599
+        // https://issues.dlang.org/show_bug.cgi?id=9599
         file.rewind();
         File.ByLineImpl!(char, char) fbl = file.byLine();
         auto fbl2 = fbl;
@@ -3137,7 +3142,7 @@ is empty, throws an `Exception`. In case of an I/O error throws
                 {
                     import core.atomic : atomicOp;
 
-                    // @@@BUG@@@ 4243
+                    // https://issues.dlang.org/show_bug.cgi?id=4243
                     oldInfo = __fhnd_info[fd];
                     atomicOp!"&="(__fhnd_info[fd], ~FHND_TEXT);
                 }
@@ -3157,7 +3162,7 @@ is empty, throws an `Exception`. In case of an I/O error throws
                 .fflush(fps); // before restoring translation mode
                 version (DIGITAL_MARS_STDIO)
                 {
-                    // @@@BUG@@@ 4243
+                    // https://issues.dlang.org/show_bug.cgi?id=4243
                     __fhnd_info[fd] = oldInfo;
                 }
                 ._setmode(fd, oldMode);
@@ -3503,8 +3508,10 @@ void main()
         writer.put("日本語"d);
         writer.put('日');
         writer.put(chain(only('本'), only('語')));
-        writer.put(repeat('#', 12)); // BUG 11945
-        writer.put(cast(immutable(ubyte)[])"日本語"); // Bug 17229
+        // https://issues.dlang.org/show_bug.cgi?id=11945
+        writer.put(repeat('#', 12));
+        // https://issues.dlang.org/show_bug.cgi?id=17229
+        writer.put(cast(immutable(ubyte)[])"日本語");
     }
     assert(File(deleteme).readln() == "日本語日本語日本語日本語############日本語");
 }
@@ -3563,7 +3570,7 @@ void main()
 
 version (StdStressTest)
 {
-    // issue 15768
+    // https://issues.dlang.org/show_bug.cgi?id=15768
     @system unittest
     {
         import std.parallelism : parallel;
@@ -3698,7 +3705,8 @@ struct LockingTextReader
     assert(x == 3);
 }
 
-@system unittest // bugzilla 13686
+// https://issues.dlang.org/show_bug.cgi?id=13686
+@system unittest
 {
     import std.algorithm.comparison : equal;
     static import std.file;
@@ -3716,7 +3724,8 @@ struct LockingTextReader
     assert(equal(ltr, "Тест".byDchar));
 }
 
-@system unittest // bugzilla 12320
+// https://issues.dlang.org/show_bug.cgi?id=12320
+@system unittest
 {
     static import std.file;
     auto deleteme = testFilename();
@@ -3730,7 +3739,8 @@ struct LockingTextReader
     assert(ltr.empty);
 }
 
-@system unittest // bugzilla 14861
+// https://issues.dlang.org/show_bug.cgi?id=14861
+@system unittest
 {
     // @system due to readf
     static import std.file;
@@ -3896,11 +3906,11 @@ void writeln(T...)(T args)
 
     if (false) writeln("wyda");
 
-    // bug 8040
+    // https://issues.dlang.org/show_bug.cgi?id=8040
     if (false) writeln(null);
     if (false) writeln(">", null, "<");
 
-    // Bugzilla 14041
+    // https://issues.dlang.org/show_bug.cgi?id=14041
     if (false)
     {
         char[8] a;
@@ -3942,9 +3952,9 @@ void writeln(T...)(T args)
 
     stdout.open(deleteme, "w");
     writeln("Hello!"c);
-    writeln("Hello!"w);    // bug 8386
-    writeln("Hello!"d);    // bug 8386
-    writeln("embedded\0null"c); // bug 8730
+    writeln("Hello!"w);    // https://issues.dlang.org/show_bug.cgi?id=8386
+    writeln("Hello!"d);    // https://issues.dlang.org/show_bug.cgi?id=8386
+    writeln("embedded\0null"c); // https://issues.dlang.org/show_bug.cgi?id=8730
     stdout.close();
     version (Windows)
         assert(cast(char[]) std.file.read(deleteme) ==
@@ -5450,7 +5460,8 @@ private size_t readlnImpl(FILE* fps, ref char[] buf, dchar terminator, File.Orie
     char[] t = ln[0 .. 2];
     t ~= 't';
     assert(t == "abt");
-    assert(ln == "abcd\n");  // bug 13856: ln stomped to "abtd"
+    // https://issues.dlang.org/show_bug.cgi?id=13856: ln stomped to "abtd"
+    assert(ln == "abcd\n");
 
     // it can also stomp the array length
     ln = new char[4];
@@ -5525,6 +5536,7 @@ version (StdUnittest) private string testFilename(string file = __FILE__, size_t
     import std.file : deleteme;
     import std.path : baseName;
 
-    // filename intentionally contains non-ASCII (Russian) characters for test Issue 7648
+    // filename intentionally contains non-ASCII (Russian) characters for
+    // https://issues.dlang.org/show_bug.cgi?id=7648
     return text(deleteme, "-детка.", baseName(file), ".", line);
 }
diff --git a/std/string.d b/std/string.d
index f341146cc3d..daacf4e6fd4 100644
--- a/std/string.d
+++ b/std/string.d
@@ -1501,7 +1501,8 @@ if (isSomeChar!Char1 && isSomeChar!Char2)
     });
 }
 
-@safe pure unittest // issue13529
+// https://issues.dlang.org/show_bug.cgi?id=13529
+@safe pure unittest
 {
     import std.conv : to;
     static foreach (S; AliasSeq!(string, wstring, dstring))
@@ -5234,7 +5235,8 @@ if (isSomeChar!C1 && isSomeChar!C2)
     assert(translate("hello world", transTable2) == "h5llorange worangerld");
 }
 
-@safe pure unittest // issue 13018
+// https://issues.dlang.org/show_bug.cgi?id=13018
+@safe pure unittest
 {
     immutable dchar[dchar] transTable1 = ['e' : '5', 'o' : '7', '5': 'q'];
     assert(translate("hello world", transTable1) == "h5ll7 w7rld");
@@ -5255,7 +5257,8 @@ if (isSomeChar!C1 && isSomeChar!C2)
     static foreach (S; AliasSeq!( char[], const( char)[], immutable( char)[],
                           wchar[], const(wchar)[], immutable(wchar)[],
                           dchar[], const(dchar)[], immutable(dchar)[]))
-    {(){ // workaround slow optimizations for large functions @@@BUG@@@ 2396
+    {(){ // workaround slow optimizations for large functions
+         // https://issues.dlang.org/show_bug.cgi?id=2396
         assert(translate(to!S("hello world"), cast(dchar[dchar])['h' : 'q', 'l' : '5']) ==
                to!S("qe55o wor5d"));
         assert(translate(to!S("hello world"), cast(dchar[dchar])['o' : 'l', 'l' : '\U00010143']) ==
@@ -5269,7 +5272,8 @@ if (isSomeChar!C1 && isSomeChar!C2)
         static foreach (T; AliasSeq!( char[], const( char)[], immutable( char)[],
                               wchar[], const(wchar)[], immutable(wchar)[],
                               dchar[], const(dchar)[], immutable(dchar)[]))
-        (){ // workaround slow optimizations for large functions @@@BUG@@@ 2396
+        (){ // workaround slow optimizations for large functions
+            // https://issues.dlang.org/show_bug.cgi?id=2396
             static foreach (R; AliasSeq!(dchar[dchar], const dchar[dchar],
                         immutable dchar[dchar]))
             {{
@@ -5313,7 +5317,8 @@ if (isSomeChar!C1 && isSomeString!S && isSomeChar!C2)
     static foreach (S; AliasSeq!( char[], const( char)[], immutable( char)[],
                           wchar[], const(wchar)[], immutable(wchar)[],
                           dchar[], const(dchar)[], immutable(dchar)[]))
-    {(){ // workaround slow optimizations for large functions @@@BUG@@@ 2396
+    {(){ // workaround slow optimizations for large functions
+         // https://issues.dlang.org/show_bug.cgi?id=2396
         assert(translate(to!S("hello world"), ['h' : "yellow", 'l' : "42"]) ==
                to!S("yellowe4242o wor42d"));
         assert(translate(to!S("hello world"), ['o' : "owl", 'l' : "\U00010143\U00010143"]) ==
@@ -5331,8 +5336,8 @@ if (isSomeChar!C1 && isSomeString!S && isSomeChar!C2)
         static foreach (T; AliasSeq!( char[], const( char)[], immutable( char)[],
                               wchar[], const(wchar)[], immutable(wchar)[],
                               dchar[], const(dchar)[], immutable(dchar)[]))
-        (){ // workaround slow optimizations for large functions @@@BUG@@@ 2396
-
+        (){ // workaround slow optimizations for large functions
+            // https://issues.dlang.org/show_bug.cgi?id=2396
             static foreach (R; AliasSeq!(string[dchar], const string[dchar],
                         immutable string[dchar]))
             {{
@@ -5396,7 +5401,8 @@ if (isSomeChar!C1 && isSomeChar!C2 && isOutputRange!(Buffer, C1))
     assert(buffer.data == "h5llorange worangerld");
 }
 
-@safe pure unittest // issue 13018
+// https://issues.dlang.org/show_bug.cgi?id=13018
+@safe pure unittest
 {
     import std.array : appender;
     immutable dchar[dchar] transTable1 = ['e' : '5', 'o' : '7', '5': 'q'];
diff --git a/std/traits.d b/std/traits.d
index 2f2656f6486..0de24ebf740 100644
--- a/std/traits.d
+++ b/std/traits.d
@@ -544,7 +544,8 @@ version (none) @safe unittest //Please uncomment me when changing packageName to
     static assert(packageName!moduleName == "std");
 }
 
-@safe unittest // issue 13741
+// https://issues.dlang.org/show_bug.cgi?id=13741
+@safe unittest
 {
     import std.ascii : isWhite;
     static assert(packageName!(isWhite) == "std");
@@ -607,7 +608,8 @@ template moduleName(alias T)
     static assert(moduleName!(X12287!int.i) == "std.traits");
 }
 
-@safe unittest // issue 13741
+// https://issues.dlang.org/show_bug.cgi?id=13741
+@safe unittest
 {
     import std.ascii : isWhite;
     static assert(moduleName!(isWhite) == "std.ascii");
@@ -1190,7 +1192,8 @@ if (func.length == 1 && isCallable!func &&
     static assert(!__traits(compiles, arity!variadicFoo));
 }
 
-@safe unittest // issue 11389
+// https://issues.dlang.org/show_bug.cgi?id=11389
+@safe unittest
 {
     alias TheType = size_t function( string[] );
     static assert(arity!TheType == 1);
@@ -1355,14 +1358,14 @@ template extractParameterStorageClassFlags(Attribs...)
     static assert(dglit_pstc.length == 1);
     static assert(dglit_pstc[0] == STC.ref_);
 
-    // Bugzilla 9317
+    // https://issues.dlang.org/show_bug.cgi?id=9317
     static inout(int) func(inout int param) { return param; }
     static assert(ParameterStorageClassTuple!(typeof(func))[0] == STC.none);
 }
 
 @safe unittest
 {
-    // Bugzilla 14253
+    // https://issues.dlang.org/show_bug.cgi?id=14253
     static struct Foo {
         ref Foo opAssign(ref Foo rhs) return { return this; }
     }
@@ -1422,7 +1425,7 @@ if (func.length == 1 && isCallable!func)
     static assert([ParameterIdentifierTuple!foo] == ["num", "name", ""]);
 }
 
-// Issue 19456
+// https://issues.dlang.org/show_bug.cgi?id=19456
 @safe unittest
 {
     struct SomeType {}
@@ -1498,7 +1501,6 @@ if (func.length == 1 && isCallable!func)
                     // like this.
                     auto " ~ val ~ " = " ~ args ~ "[0];
                     auto " ~ ptr ~ " = &" ~ val ~ ";
-                        // workaround Bugzilla 16582
                     return *" ~ ptr ~ ";
                 };
             ");
@@ -1539,7 +1541,8 @@ if (func.length == 1 && isCallable!func)
     static assert(   ParameterDefaults!foo[3] == 0);
 }
 
-@safe unittest // issue 17192
+// https://issues.dlang.org/show_bug.cgi?id=17192
+@safe unittest
 {
     static void func(int i, int PT, int __pd_value, int __pd_val, int __args,
         int name, int args, int val, int ptr, int args_, int val_, int ptr_)
@@ -1572,7 +1575,8 @@ alias ParameterDefaultValueTuple = ParameterDefaults;
     static assert(   PDVT!baz[2] == "hello");
     static assert(is(typeof(PDVT!baz) == typeof(AliasSeq!(void, 1, "hello"))));
 
-    // bug 10800 - property functions return empty string
+    // property functions return empty string
+    // https://issues.dlang.org/show_bug.cgi?id=10800
     @property void foo(int x = 3) { }
     static assert(PDVT!foo.length == 1);
     static assert(PDVT!foo[0] == 3);
@@ -1584,9 +1588,11 @@ alias ParameterDefaultValueTuple = ParameterDefaults;
 
         static immutable Colour white = Colour(255,255,255,255);
     }
+    // https://issues.dlang.org/show_bug.cgi?id=8106
     void bug8106(Colour c = Colour.white) {}
     //pragma(msg, PDVT!bug8106);
     static assert(PDVT!bug8106[0] == Colour.white);
+    // https://issues.dlang.org/show_bug.cgi?id=16582
     void bug16582(scope int* val = null) {}
     static assert(PDVT!bug16582[0] is null);
 }
@@ -2868,7 +2874,7 @@ template RepresentationTypeTuple(T)
     alias R1 = RepresentationTypeTuple!C;
     static assert(R1.length == 2 && is(R1[0] == int) && is(R1[1] == float));
 
-    /* Issue 6642 */
+    /* https://issues.dlang.org/show_bug.cgi?id=6642 */
     import std.typecons : Rebindable;
 
     struct S5 { int a; Rebindable!(immutable Object) b; }
@@ -2945,7 +2951,7 @@ private template hasRawAliasing(T)
     static assert(!hasRawAliasing!S2);
 }
 
-// Issue 19228
+// https://issues.dlang.org/show_bug.cgi?id=19228
 @safe unittest
 {
     static struct C
@@ -3434,7 +3440,8 @@ template hasIndirections(T)
     static assert( hasIndirections!S26);
 }
 
-@safe unittest //12000
+// https://issues.dlang.org/show_bug.cgi?id=12000
+@safe unittest
 {
     static struct S(T)
     {
@@ -3485,7 +3492,7 @@ template hasUnsharedAliasing(T...)
 
 @safe unittest
 {
-    /* Issue 6642 */
+    /* https://issues.dlang.org/show_bug.cgi?id=6642 */
     import std.typecons : Rebindable;
     struct S8 { int a; Rebindable!(immutable Object) b; }
     static assert(!hasUnsharedAliasing!S8);
@@ -3532,7 +3539,7 @@ template hasUnsharedAliasing(T...)
     static assert(!hasUnsharedAliasing!(Rebindable!(shared Object)));
     static assert( hasUnsharedAliasing!(Rebindable!Object));
 
-    /* Issue 6979 */
+    /* https://issues.dlang.org/show_bug.cgi?id=6979 */
     static assert(!hasUnsharedAliasing!(int, shared(int)*));
     static assert( hasUnsharedAliasing!(int, int*));
     static assert( hasUnsharedAliasing!(int, const(int)[]));
@@ -3858,7 +3865,7 @@ enum hasMember(T, string name) = __traits(hasMember, T, name);
 
 @safe unittest
 {
-    // 8321
+    // https://issues.dlang.org/show_bug.cgi?id=8321
     struct S {
         int x;
         void f(){}
@@ -4291,7 +4298,8 @@ Use EnumMembers to generate a switch statement using static foreach.
     static assert([ EnumMembers!A ] == [ A.a, A.b, A.c, A.d, A.e ]);
 }
 
-@safe unittest // Bugzilla 14561: huge enums
+// https://issues.dlang.org/show_bug.cgi?id=14561: huge enums
+@safe unittest
 {
     string genEnum()
     {
@@ -4415,7 +4423,8 @@ if (is(T == class))
     static assert(is(BaseClassesTuple!C3 == AliasSeq!(C2, C1, Object)));
 }
 
-@safe unittest // issue 17276
+// https://issues.dlang.org/show_bug.cgi?id=17276
+@safe unittest
 {
     extern (C++) static interface Ext
     {
@@ -4668,7 +4677,8 @@ if (is(C == class) || is(C == interface))
     static assert(__traits(isSame, foos[1], B.foo));
 }
 
-@safe unittest // Issue 15920
+// https://issues.dlang.org/show_bug.cgi?id=15920
+@safe unittest
 {
     import std.meta : AliasSeq;
     class A
@@ -4687,7 +4697,8 @@ if (is(C == class) || is(C == interface))
     assert(__traits(isSame, fs[1], bfs[0]) || __traits(isSame, fs[1], bfs[1]));
 }
 
-@safe unittest // Issue 8388
+// https://issues.dlang.org/show_bug.cgi?id=8388
+@safe unittest
 {
     class C
     {
@@ -4699,7 +4710,7 @@ if (is(C == class) || is(C == interface))
         /*
          Commented out, because this causes a cyclic dependency
          between module constructors/destructors error. Might
-         be caused by issue 20529. */
+         be caused by https://issues.dlang.org/show_bug.cgi?id=20529. */
         // static this() {}
 
         ~this() {}
@@ -5397,7 +5408,8 @@ if (is(F == function) && is(G == function) ||
         }
         /*
          * Check for parameters:
-         *  - require exact match for types (cf. bugzilla 3075)
+         *  - require exact match for types
+         *    (cf. https://issues.dlang.org/show_bug.cgi?id=3075)
          *  - require exact match for in, out, ref and lazy
          *  - overrider can add scope, but can't remove
          */
@@ -6117,7 +6129,8 @@ enum bool isIntegral(T) = is(IntegralTypeOf!T) && !isAggregateType!T;
     static assert(!isIntegral!float);
 
     enum EU : uint { a = 0, b = 1, c = 2 }  // base type is unsigned
-    enum EI : int { a = -1, b = 0, c = 1 }  // base type is signed (bug 7909)
+    // base type is signed (https://issues.dlang.org/show_bug.cgi?id=7909)
+    enum EI : int { a = -1, b = 0, c = 1 }
     static assert(isIntegral!EU &&  isUnsigned!EU && !isSigned!EU);
     static assert(isIntegral!EI && !isUnsigned!EI &&  isSigned!EI);
 }
@@ -6667,7 +6680,8 @@ template isConvertibleToString(T)
     assert(!isConvertibleToString!(char[]));
 }
 
-@safe unittest // Bugzilla 16573
+// https://issues.dlang.org/show_bug.cgi?id=16573
+@safe unittest
 {
     enum I : int { foo = 1 }
     enum S : string { foo = "foo" }
@@ -7457,7 +7471,7 @@ template isNestedFunction(alias f)
     static assert(!isNestedFunction!f);
 }
 
-// issue 18669
+// https://issues.dlang.org/show_bug.cgi?id=18669
 @safe unittest
 {
     static class Outer
@@ -8113,7 +8127,8 @@ version (StdUnittest) private void freeFunc(string);
     static assert(mangledName!mangledName == "3std6traits11mangledName");
     static assert(mangledName!freeFunc == "_D3std6traits8freeFuncFAyaZv");
     int x;
-  static if (is(typeof({ return x; }) : int delegate() pure))   // issue 9148
+    // https://issues.dlang.org/show_bug.cgi?id=9148
+  static if (is(typeof({ return x; }) : int delegate() pure))
     static assert(mangledName!((int a) { return a+x; }) == "DFNaNbNiNfiZi");  // pure nothrow @safe @nogc
   else
     static assert(mangledName!((int a) { return a+x; }) == "DFNbNiNfiZi");  // nothrow @safe @nnogc
@@ -8122,7 +8137,7 @@ version (StdUnittest) private void freeFunc(string);
 @system unittest
 {
     // @system due to demangle
-    // Test for bug 5718
+    // Test for https://issues.dlang.org/show_bug.cgi?id=5718
     import std.demangle : demangle;
     int foo;
     auto foo_demangled = demangle(mangledName!foo);
@@ -8560,7 +8575,7 @@ template getSymbolsByUDA(alias symbol, alias attribute)
     static assert(getSymbolsByUDA!(D, UDA).length == 0);
 }
 
-// Issue 18314
+// https://issues.dlang.org/show_bug.cgi?id=18314
 @safe unittest
 {
     enum attr1;
@@ -8570,7 +8585,7 @@ template getSymbolsByUDA(alias symbol, alias attribute)
     {
         @attr1
         int n;
-        // Removed due to Issue 16206
+        // Removed due to https://issues.dlang.org/show_bug.cgi?id=16206
         //@attr1
         //void foo()(string){}
         @attr1
@@ -8583,7 +8598,8 @@ template getSymbolsByUDA(alias symbol, alias attribute)
     static assert(getSymbolsByUDA!(A, attr2).length == 1);
 }
 
-// #15335: getSymbolsByUDA fails if type has private members
+// getSymbolsByUDA fails if type has private members
+// https://issues.dlang.org/show_bug.cgi?id=15335
 @safe unittest
 {
     // HasPrivateMembers has, well, private members, one of which has a UDA.
@@ -8597,7 +8613,8 @@ template getSymbolsByUDA(alias symbol, alias attribute)
     static assert(hasUDA!(getSymbolsByUDA!(HasPrivateMembers, Attr)[0], Attr));
 }
 
-// #16387: getSymbolsByUDA works with structs but fails with classes
+// getSymbolsByUDA works with structs but fails with classes
+// https://issues.dlang.org/show_bug.cgi?id=16387
 @safe unittest
 {
     enum Attr;
@@ -8611,7 +8628,8 @@ template getSymbolsByUDA(alias symbol, alias attribute)
     static assert(res[0].stringof == "a");
 }
 
-// #18884: getSymbolsByUDA fails on AliasSeq members
+// getSymbolsByUDA fails on AliasSeq members
+// https://issues.dlang.org/show_bug.cgi?id=18884
 @safe unittest
 {
     struct X
@@ -8622,7 +8640,8 @@ template getSymbolsByUDA(alias symbol, alias attribute)
     static assert(is(getSymbolsByUDA!(X, X) == AliasSeq!()));
 }
 
-// #18624: getSymbolsByUDA produces wrong result if one of the symbols having the UDA is a function
+// getSymbolsByUDA produces wrong result if one of the symbols having the UDA is a function
+// https://issues.dlang.org/show_bug.cgi?id=18624
 @safe unittest
 {
     enum Attr;
@@ -8637,7 +8656,8 @@ template getSymbolsByUDA(alias symbol, alias attribute)
     static assert(getSymbolsByUDA!(A, Attr).stringof == "tuple(a, a, c)");
 }
 
-// Issue 20054: getSymbolsByUDA no longer works on modules
+// getSymbolsByUDA no longer works on modules
+// https://issues.dlang.org/show_bug.cgi?id=20054
 version (StdUnittest)
 {
     @("Issue20054")
diff --git a/std/typecons.d b/std/typecons.d
index 16bb6b6ceef..0db5818ad35 100644
--- a/std/typecons.d
+++ b/std/typecons.d
@@ -443,7 +443,7 @@ private enum bool distinctFieldNames(names...) = __traits(compiles,
     static assert(!distinctFieldNames!(string, "abc", string, "abc"));
     static assert(distinctFieldNames!(string, "abc", int, "abd"));
     static assert(!distinctFieldNames!(int, "abc", string, "abd", int, "abc"));
-    // Issue 19240
+    // https://issues.dlang.org/show_bug.cgi?id=19240
     static assert(!distinctFieldNames!(int, "int"));
 }
 
@@ -940,7 +940,7 @@ if (distinctFieldNames!(Specs))
         if (names.length == 0 || allSatisfy!(isSomeString, typeof(names)))
         {
             import std.algorithm.comparison : equal;
-            // to circumvent bug 16418
+            // to circumvent https://issues.dlang.org/show_bug.cgi?id=16418
             static if (names.length == 0 || equal([names], [fieldNames]))
                 return this;
             else
@@ -1158,7 +1158,8 @@ if (distinctFieldNames!(Specs))
             static assert(
                 (typeof(this).alignof % typeof(return).alignof == 0) &&
                 (expand[from].offsetof % typeof(return).alignof == 0),
-                "Slicing by reference is impossible because of an alignment mistmatch. (See Phobos issue #15645.)");
+                "Slicing by reference is impossible because of an alignment mistmatch" ~
+                " (See https://issues.dlang.org/show_bug.cgi?id=15645).");
 
             return *cast(typeof(return)*) &(field[from]);
         }
@@ -1173,7 +1174,7 @@ if (distinctFieldNames!(Specs))
             static assert(is(typeof(s) == Tuple!(string, float)));
             assert(s[0] == "abc" && s[1] == 4.5);
 
-            // Phobos issue #15645
+            // https://issues.dlang.org/show_bug.cgi?id=15645
             Tuple!(int, short, bool, double) b;
             static assert(!__traits(compiles, b.slice!(2, 4)));
         }
@@ -1409,9 +1410,9 @@ if (distinctFieldNames!(Specs))
     assert(t.expand.only.sum == 3);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=4582
 @safe unittest
 {
-    // Bugzilla 4582
     static assert(!__traits(compiles, Tuple!(string, "id", int, "id")));
     static assert(!__traits(compiles, Tuple!(string, "str", int, "i", string, "str", float)));
 }
@@ -1717,7 +1718,7 @@ private template ReverseTupleSpecs(T...)
         ssCopy[1] = ssCopy[0];
         assert(ssCopy[1].count == 2);
     }
-    // bug 2800
+    // https://issues.dlang.org/show_bug.cgi?id=2800
     {
         static struct R
         {
@@ -1737,7 +1738,7 @@ private template ReverseTupleSpecs(T...)
     {
         auto t1 = Tuple!(int, double)(1, 1);
 
-        // 8702
+        // https://issues.dlang.org/show_bug.cgi?id=8702
         auto t8702a = tuple(tuple(1));
         auto t8702b = Tuple!(Tuple!(int))(Tuple!(int)(1));
     }
@@ -1752,19 +1753,19 @@ private template ReverseTupleSpecs(T...)
         // incompatible
         static assert(!__traits(compiles, Tuple!(int, int)(y)));
     }
-    // 6275
+    // https://issues.dlang.org/show_bug.cgi?id=6275
     {
         const int x = 1;
         auto t1 = tuple(x);
         alias T = Tuple!(const(int));
         auto t2 = T(1);
     }
-    // 9431
+    // https://issues.dlang.org/show_bug.cgi?id=9431
     {
         alias T = Tuple!(int[1][]);
         auto t = T([[10]]);
     }
-    // 7666
+    // https://issues.dlang.org/show_bug.cgi?id=7666
     {
         auto tup = tuple(1, "2");
         assert(tup.reverse == tuple("2", 1));
@@ -1803,8 +1804,9 @@ private template ReverseTupleSpecs(T...)
         static assert( is(typeof(tc2 == tm2)));
         static assert( is(typeof(tc2 == tc2)));
 
+        // https://issues.dlang.org/show_bug.cgi?id=8686
         struct Equ3 { bool opEquals(T)(T) { return true; } }
-        auto  tm3 = tuple(Equ3.init);           // bugzilla 8686
+        auto  tm3 = tuple(Equ3.init);
         const tc3 = tuple(Equ3.init);
         static assert( is(typeof(tm3 == tm3)));
         static assert( is(typeof(tm3 == tc3)));
@@ -1853,7 +1855,7 @@ private template ReverseTupleSpecs(T...)
         static assert( is(typeof(tc4 < tm4)));
         static assert( is(typeof(tc4 < tc4)));
     }
-    // Bugzilla 14890
+    // https://issues.dlang.org/show_bug.cgi?id=14890
     static void test14890(inout int[] dummy)
     {
         alias V = Tuple!(int, int);
@@ -1895,7 +1897,7 @@ private template ReverseTupleSpecs(T...)
 }
 @safe unittest
 {
-    // Bugzilla 10686
+    // https://issues.dlang.org/show_bug.cgi?id=10686
     immutable Tuple!(int) t1;
     auto r1 = t1[0]; // OK
     immutable Tuple!(int, "x") t2;
@@ -1905,7 +1907,7 @@ private template ReverseTupleSpecs(T...)
 {
     import std.exception : assertCTFEable;
 
-    // Bugzilla 10218
+    // https://issues.dlang.org/show_bug.cgi?id=10218
     assertCTFEable!(
     {
         auto t = tuple(1);
@@ -1940,7 +1942,7 @@ private template ReverseTupleSpecs(T...)
     TISIS e = TISIS(ss);
 }
 
-// Bugzilla #9819
+// https://issues.dlang.org/show_bug.cgi?id=9819
 @safe unittest
 {
     alias T = Tuple!(int, "x", double, "foo");
@@ -1951,7 +1953,7 @@ private template ReverseTupleSpecs(T...)
     static assert(Fields.fieldNames == AliasSeq!("id", "", ""));
 }
 
-// Bugzilla 13837
+// https://issues.dlang.org/show_bug.cgi?id=13837
 @safe unittest
 {
     // New behaviour, named arguments.
@@ -2009,7 +2011,7 @@ private template ReverseTupleSpecs(T...)
     //static assert(tupStr == `Tuple!(int, double)(1, 1)`);
 }
 
-// Issue 17803, parte uno
+// https://issues.dlang.org/show_bug.cgi?id=17803, parte uno
 @safe unittest
 {
     auto a = tuple(3, "foo");
@@ -2270,7 +2272,8 @@ if (is(T == class) || is(T == interface) || isDynamicArray!T || isAssociativeArr
     a = new Widget;
 }
 
-@safe unittest // issue 16054
+// https://issues.dlang.org/show_bug.cgi?id=16054
+@safe unittest
 {
     Rebindable!(immutable Object) r;
     static assert(__traits(compiles, r.get()));
@@ -2288,7 +2291,9 @@ if (is(T == class) || is(T == interface) || isDynamicArray!T || isAssociativeArr
         ~ " by forwarding to A.toHash().");
 }
 
-@system unittest // issue 18615: Rebindable!A should use A.opEquals
+// https://issues.dlang.org/show_bug.cgi?id=18615
+// Rebindable!A should use A.opEqualsa
+@system unittest
 {
     class CustomOpEq
     {
@@ -2333,7 +2338,8 @@ if (is(T == class) || is(T == interface) || isDynamicArray!T || isAssociativeArr
         ~ " comparable against Object itself and use Object.opEquals.");
 }
 
-@safe unittest // issue 18755
+// https://issues.dlang.org/show_bug.cgi?id=18755
+@safe unittest
 {
     static class Foo
     {
@@ -2494,7 +2500,7 @@ Rebindable!T rebindable(T)(Rebindable!T obj)
     assert(rebindable(arr) == arr);
     assert(rebindable(arrConst) == arr);
 
-    // Issue 7654
+    // https://issues.dlang.org/show_bug.cgi?id=7654
     immutable(char[]) s7654;
     Rebindable!(typeof(s7654)) r7654 = s7654;
 
@@ -2505,7 +2511,7 @@ Rebindable!T rebindable(T)(Rebindable!T obj)
         static assert(is(Rebindable!(T[]) == T[]));
     }
 
-    // Issue 12046
+    // https://issues.dlang.org/show_bug.cgi?id=12046
     static assert(!__traits(compiles, Rebindable!(int[1])));
     static assert(!__traits(compiles, Rebindable!(const int[1])));
 
@@ -2637,13 +2643,13 @@ string alignForSize(E...)(const char[][] names...)
 
     enum passAbnormalX = x == "int[] x;\ndouble[5] w;\nshort z;\nchar[3] y;\n";
     enum passAbnormalY = y == "Foo y;\ndouble z;\nubyte x;\n";
-    // ^ blame http://d.puremagic.com/issues/show_bug.cgi?id=231
+    // ^ blame https://issues.dlang.org/show_bug.cgi?id=231
 
     static assert(passNormalX || passAbnormalX && double.alignof <= (int[]).alignof);
     static assert(passNormalY || passAbnormalY && double.alignof <= int.alignof);
 }
 
-// Issue 12914
+// https://issues.dlang.org/show_bug.cgi?id=12914
 @safe unittest
 {
     immutable string[] fieldNames = ["x", "y"];
@@ -2759,7 +2765,7 @@ Params:
         assert(a != Nullable!int(29));
     }
 
-    // Issue 17482
+    // https://issues.dlang.org/show_bug.cgi?id=17482
     @system unittest
     {
         import std.variant : Variant;
@@ -2853,7 +2859,7 @@ Returns:
     assert(!ni.isNull);
 }
 
-// Issue 14940
+// https://issues.dlang.org/show_bug.cgi?id=14940
 @safe unittest
 {
     import std.array : appender;
@@ -2865,7 +2871,7 @@ Returns:
     assert(app.data == "1");
 }
 
-// Issue 19799
+// https://issues.dlang.org/show_bug.cgi?id=19799
 @safe unittest
 {
     import std.format : format;
@@ -3161,9 +3167,10 @@ deprecated(
     s.nullify();
     assert(s.isNull);
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=9404
 @safe unittest
 {
-    // Bugzilla 9404
     alias N = Nullable!int;
 
     void foo(N a)
@@ -3259,9 +3266,10 @@ deprecated(
         c = a;
     }}
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=10268
 @system unittest
 {
-    // Bugzilla 10268
     import std.json;
     JSONValue value = null;
     auto na = Nullable!JSONValue(value);
@@ -3310,18 +3318,20 @@ deprecated(
         assert(*x4.get.val == 10);
     }
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=10357
 @safe unittest
 {
-    // Bugzila 10357
     import std.datetime;
     Nullable!SysTime time = SysTime(0);
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=10915
 @system unittest
 {
     import std.conv : to;
     import std.array;
 
-    // Bugzilla 10915
     Appender!string buffer;
 
     Nullable!int ni;
@@ -3360,7 +3370,7 @@ deprecated(
     assert(ntts.to!string() == "2.5");
 }
 
-// Bugzilla 14477
+// https://issues.dlang.org/show_bug.cgi?id=14477
 @safe unittest
 {
     static struct DisabledDefaultConstructor
@@ -3373,7 +3383,7 @@ deprecated(
     var.nullify;
 }
 
-// Issue 17440
+// https://issues.dlang.org/show_bug.cgi?id=17440
 @system unittest
 {
     static interface I { }
@@ -3398,7 +3408,7 @@ deprecated(
     assert(c.canary == 0xA71FE);
 }
 
-// bugzilla issue 19037
+// https://issues.dlang.org/show_bug.cgi?id=19037
 @safe unittest
 {
     import std.datetime : SysTime;
@@ -3541,7 +3551,7 @@ Params:
     template toString()
     {
         import std.format : FormatSpec, formatValue;
-        // Needs to be a template because of DMD @@BUG@@ 13737.
+        // Needs to be a template because of https://issues.dlang.org/show_bug.cgi?id=13737.
         void toString()(scope void delegate(const(char)[]) sink, scope const ref FormatSpec!char fmt)
         {
             if (isNull)
@@ -3776,7 +3786,8 @@ if (is (typeof(nullValue) == T))
 
 @nogc nothrow pure @safe unittest
 {
-    // issue 19226 - fully handle non-self-equal nullValue
+    // https://issues.dlang.org/show_bug.cgi?id=19226
+    // fully handle non-self-equal nullValue
     static struct Fraction
     {
         int denominator;
@@ -3867,7 +3878,7 @@ if (is (typeof(nullValue) == T))
 {
     import std.conv : to;
 
-    // Bugzilla 10915
+    // https://issues.dlang.org/show_bug.cgi?id=10915
     Nullable!(int, 1) ni = 1;
     assert(ni.to!string() == "Nullable.null");
 
@@ -4022,7 +4033,7 @@ Params:
     template toString()
     {
         import std.format : FormatSpec, formatValue;
-        // Needs to be a template because of DMD @@BUG@@ 13737.
+        // Needs to be a template because of https://issues.dlang.org/show_bug.cgi?id=13737.
         void toString()(scope void delegate(const(char)[]) sink, scope const ref FormatSpec!char fmt)
         {
             if (isNull)
@@ -4269,11 +4280,12 @@ auto nullableRef(T)(T* t)
         c = a;
     }}
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=10915
 @system unittest
 {
     import std.conv : to;
 
-    // Bugzilla 10915
     NullableRef!int nri;
     assert(nri.to!string() == "Nullable.null");
 
@@ -4375,7 +4387,7 @@ alias BlackHole(Base) = AutoImplement!(Base, generateEmptyFunction, isAbstractFu
         c.doSomething();
     }
 
-    // Bugzilla 12058
+    // https://issues.dlang.org/show_bug.cgi?id=12058
     interface Foo
     {
         inout(Object) foo() inout;
@@ -4685,7 +4697,7 @@ private static:
     //:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::://
 
     // Add a non-final check to the cherrypickMethod.
-    enum bool canonicalPicker(fun.../+[BUG 4217]+/) =
+    enum bool canonicalPicker(fun.../+[https://issues.dlang.org/show_bug.cgi?id=4217]+/) =
         !__traits(isFinalFunction, fun[0]) && cherrypickMethod!(fun);
 
     /*
@@ -4787,7 +4799,7 @@ private static:
         mixin CommonGeneratingPolicy;
 
         /* Generates constructor body.  Just forward to the base class' one. */
-        string generateFunctionBody(ctor.../+[BUG 4217]+/)() @property
+        string generateFunctionBody(ctor.../+[https://issues.dlang.org/show_bug.cgi?id=4217]+/)() @property
         {
             enum varstyle = variadicFunctionStyle!(typeof(&ctor[0]));
 
@@ -4808,7 +4820,7 @@ private static:
         mixin CommonGeneratingPolicy;
 
         /* Geneartes method body. */
-        string generateFunctionBody(func.../+[BUG 4217]+/)() @property
+        string generateFunctionBody(func.../+[https://issues.dlang.org/show_bug.cgi?id=4217]+/)() @property
         {
             return generateMethodBody!(Base, func); // given
         }
@@ -4939,7 +4951,8 @@ private static:
     }
     /+ // deep inheritance
     {
-    // XXX [BUG 2525,3525]
+    // https://issues.dlang.org/show_bug.cgi?id=2525
+    // https://issues.dlang.org/show_bug.cgi?id=3525
     // NOTE: [r494] func.c(504-571) FuncDeclaration::semantic()
         interface I { void foo(); }
         interface J : I {}
@@ -4949,7 +4962,9 @@ private static:
     }+/
 }
 
-// Issue 17177 - AutoImplement fails on function overload sets with "cannot infer type from overloaded function symbol"
+// https://issues.dlang.org/show_bug.cgi?id=17177
+// AutoImplement fails on function overload sets with
+// "cannot infer type from overloaded function symbol"
 @system unittest
 {
     static class Issue17177
@@ -4993,8 +5008,9 @@ private static:
 
 version (StdUnittest)
 {
-    // Issue 10647
-    // Add prefix "issue10647_" as a workaround for issue 1238
+    // https://issues.dlang.org/show_bug.cgi?id=10647
+    // Add prefix "issue10647_" as a workaround for
+    // https://issues.dlang.org/show_bug.cgi?id=1238
     private string issue10647_generateDoNothing(C, alias fun)() @property
     {
         string stmt;
@@ -5146,7 +5162,8 @@ private static:
                 // declaration here to reveal possible hidden functions.
                 code ~= format("alias %s = %s.%s;\n",
                             oset.name,
-                            Policy.BASE_CLASS_ID, // [BUG 2540] super.
+                            // super: https://issues.dlang.org/show_bug.cgi?id=2540
+                            Policy.BASE_CLASS_ID,
                             oset.name);
             }
         }
@@ -5352,7 +5369,7 @@ private static:
 Predefined how-policies for `AutoImplement`.  These templates are also used by
 `BlackHole` and `WhiteHole`, respectively.
  */
-template generateEmptyFunction(C, func.../+[BUG 4217]+/)
+template generateEmptyFunction(C, func.../+[https://issues.dlang.org/show_bug.cgi?id=4217]+/)
 {
     static if (is(ReturnType!(func) == void))
         enum string generateEmptyFunction = q{
@@ -5502,7 +5519,7 @@ if (Targets.length >= 1 && allSatisfy!(isMutable, Targets))
             alias type = F;
         }
 
-        // issue 12064: Remove NVI members
+        // https://issues.dlang.org/show_bug.cgi?id=12064: Remove NVI members
         template OnlyVirtual(members...)
         {
             enum notFinal(alias T) = !__traits(isFinalFunction, T);
@@ -5837,9 +5854,10 @@ private interface Structural
         assert(d.draw(10) == 10);
     }
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=10377
 @system unittest
 {
-    // Bugzilla 10377
     import std.range, std.algorithm;
 
     interface MyInputRange(T)
@@ -5854,9 +5872,10 @@ private interface Structural
     auto r = iota(0,10,1).inputRangeObject().wrap!(MyInputRange!int)();
     assert(equal(r, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]));
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=10536
 @system unittest
 {
-    // Bugzilla 10536
     interface Interface
     {
         int foo();
@@ -5888,7 +5907,8 @@ private interface Structural
     assert(i.bar(10) == 100);
 }
 
-@system unittest // issue 12064
+// https://issues.dlang.org/show_bug.cgi?id=12064
+@system unittest
 {
     interface I
     {
@@ -6249,7 +6269,8 @@ if (!is(T == class) && !(is(T == interface)))
         private enum enableGCScan = hasIndirections!T;
     }
 
-    extern(C) private pure nothrow @nogc static // TODO remove pure when https://issues.dlang.org/show_bug.cgi?id=15862 has been fixed
+    // TODO remove pure when https://issues.dlang.org/show_bug.cgi?id=15862 has been fixed
+    extern(C) private pure nothrow @nogc static
     {
         pragma(mangle, "free") void pureFree( void *ptr );
         static if (enableGCScan)
@@ -6523,7 +6544,8 @@ pure @system unittest
     }
     auto a = A(4);
     auto b = a.copy();
-    assert(a.x._refCounted._store._count == 2, "BUG 4356 still unfixed");
+    assert(a.x._refCounted._store._count == 2,
+           "https://issues.dlang.org/show_bug.cgi?id=4356 still unfixed");
 }
 
 @betterC pure @system nothrow @nogc unittest
@@ -6534,7 +6556,7 @@ pure @system unittest
     swap(p1, p2);
 }
 
-// 6606
+// https://issues.dlang.org/show_bug.cgi?id=6606
 @betterC @safe pure nothrow @nogc unittest
 {
     union U {
@@ -6549,7 +6571,7 @@ pure @system unittest
     alias SRC = RefCounted!S;
 }
 
-// 6436
+// https://issues.dlang.org/show_bug.cgi?id=6436
 @betterC @system pure unittest
 {
     struct S { this(ref int val) { assert(val == 3); ++val; } }
@@ -7105,7 +7127,7 @@ mixin template Proxy(alias a)
     h.ifti2(4);
     h.ifti3!int(4, 3);
 
-    // bug5896 test
+    // https://issues.dlang.org/show_bug.cgi?id=5896 test
     assert(h.opCast!int() == 0);
     assert(cast(int) h == 0);
     const ih = new const Hoge(new Foo());
@@ -7266,9 +7288,10 @@ mixin template Proxy(alias a)
     MyFoo2 f2;
     f2 = f2;
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=8613
 @safe unittest
 {
-    // bug8613
     static struct Name
     {
         mixin Proxy!val;
@@ -7291,7 +7314,8 @@ private enum isDIP1000 = __traits(compiles, () @safe {
 static if (isDIP1000) {} else
 @system unittest
 {
-    // bug14213, using function for the payload
+    // https://issues.dlang.org/show_bug.cgi?id=14213
+    // using function for the payload
     static struct S
     {
         int foo() { return 12; }
@@ -7314,7 +7338,7 @@ static if (isDIP1000) {} else
 
 // Check all floating point comparisons for both Proxy and Typedef,
 // also against int and a Typedef!int, to be as regression-proof
-// as possible. bug 15561
+// as possible. https://issues.dlang.org/show_bug.cgi?id=15561
 @safe unittest
 {
     static struct MyFloatImpl
@@ -7379,7 +7403,8 @@ struct Typedef(T, T init = T.init, string cookie=null)
 {
     private T Typedef_payload = init;
 
-    // issue 18415 : prevent default construction if original type does too.
+    // https://issues.dlang.org/show_bug.cgi?id=18415
+    // prevent default construction if original type does too.
     static if ((is(T == struct) || is(T == union)) && !is(typeof({T t;})))
     {
         @disable this();
@@ -7514,7 +7539,7 @@ struct Typedef(T, T init = T.init, string cookie=null)
     static assert(!is(MoneyEuros == MoneyDollars));
 }
 
-// issue 12461
+// https://issues.dlang.org/show_bug.cgi?id=12461
 @safe unittest
 {
     alias Int = Typedef!int;
@@ -7623,7 +7648,8 @@ template TypedefType(T)
     assert(drange3[$] == 123);
 }
 
-@safe @nogc pure nothrow unittest // Bugzilla 18415
+// https://issues.dlang.org/show_bug.cgi?id=18415
+@safe @nogc pure nothrow unittest
 {
     struct NoDefCtorS{@disable this();}
     union NoDefCtorU{@disable this();}
@@ -7631,7 +7657,8 @@ template TypedefType(T)
     static assert(!is(typeof({Typedef!NoDefCtorU u;})));
 }
 
-@safe @nogc pure nothrow unittest // Bugzilla 11703
+// https://issues.dlang.org/show_bug.cgi?id=11703
+@safe @nogc pure nothrow unittest
 {
     alias I = Typedef!int;
     static assert(is(typeof(I.min) == I));
@@ -7648,7 +7675,7 @@ template TypedefType(T)
 
 @safe unittest
 {
-    // bug8655
+    // https://issues.dlang.org/show_bug.cgi?id=8655
     import std.typecons;
     import std.bitmanip;
     static import core.stdc.config;
@@ -7664,7 +7691,8 @@ template TypedefType(T)
     }
 }
 
-@safe unittest // Issue 12596
+// https://issues.dlang.org/show_bug.cgi?id=12596
+@safe unittest
 {
     import std.typecons;
     alias TD = Typedef!int;
@@ -7953,7 +7981,8 @@ if (alignment > 0 && !((alignment - 1) & alignment))
     return (n + badEnd) & ~badEnd;
 }
 
-@system unittest // Issue 6580 testcase
+// https://issues.dlang.org/show_bug.cgi?id=6580 testcase
+@system unittest
 {
     enum alignment = (void*).alignof;
 
@@ -8016,7 +8045,8 @@ if (alignment > 0 && !((alignment - 1) & alignment))
     }
 }
 
-@system unittest // Original Issue 6580 testcase
+// Original https://issues.dlang.org/show_bug.cgi?id=6580 testcase
+@system unittest
 {
     class C { int i; byte b; }
 
@@ -8069,7 +8099,8 @@ if (alignment > 0 && !((alignment - 1) & alignment))
     assert(A.dead, "asdasd");
 }
 
-@system unittest // Issue 8039 testcase
+// https://issues.dlang.org/show_bug.cgi?id=8039 testcase
+@system unittest
 {
     static int dels;
     static struct S { ~this(){ ++dels; } }
@@ -8094,7 +8125,7 @@ if (alignment > 0 && !((alignment - 1) & alignment))
 
 @system unittest
 {
-    // bug4500
+    // https://issues.dlang.org/show_bug.cgi?id=4500
     class A
     {
         this() { a = this; }
@@ -8834,7 +8865,8 @@ template ReplaceTypeUnless(alias pred, From, To, T...)
             alias ReplaceTypeUnless = U!(staticMap!(replaceTemplateArgs, V));
         }
         else static if (is(T[0] == struct))
-            // don't match with alias this struct below (Issue 15168)
+            // don't match with alias this struct below
+            // https://issues.dlang.org/show_bug.cgi?id=15168
             alias ReplaceTypeUnless = T[0];
         else static if (is(T[0] == U[], U))
             alias ReplaceTypeUnless = ReplaceTypeUnless!(pred, From, To, U)[];
@@ -9030,7 +9062,7 @@ private template replaceTypeInFunctionTypeUnless(alias pred, From, To, fun)
             string[3] function(string[] arr, string[2] ...) pure @trusted,
     );
 
-    // Bugzilla 15168
+    // https://issues.dlang.org/show_bug.cgi?id=15168
     static struct T1 { string s; alias s this; }
     static struct T2 { char[10] s; alias s this; }
     static struct T3 { string[string] s; alias s this; }
@@ -9041,7 +9073,8 @@ private template replaceTypeInFunctionTypeUnless(alias pred, From, To, fun)
     );
 }
 
-@safe unittest // Bugzilla 17116
+// https://issues.dlang.org/show_bug.cgi?id=17116
+@safe unittest
 {
     alias ConstDg = void delegate(float) const;
     alias B = void delegate(int) const;
@@ -9049,22 +9082,24 @@ private template replaceTypeInFunctionTypeUnless(alias pred, From, To, fun)
     static assert(is(B == A));
 }
 
-
-@safe unittest // Bugzilla 19696
+ // https://issues.dlang.org/show_bug.cgi?id=19696
+@safe unittest
 {
     static struct T(U) {}
     static struct S { T!int t; alias t this; }
     static assert(is(ReplaceType!(float, float, S) == S));
 }
 
-@safe unittest // Bugzilla 19697
+ // https://issues.dlang.org/show_bug.cgi?id=19697
+@safe unittest
 {
     class D(T) {}
     class C : D!C {}
     static assert(is(ReplaceType!(float, float, C)));
 }
 
-@safe unittest // Bugzilla 16132
+// https://issues.dlang.org/show_bug.cgi?id=16132
+@safe unittest
 {
     interface I(T) {}
     class C : I!int {}
diff --git a/std/uni.d b/std/uni.d
index 46a1de119fb..ff4db891342 100644
--- a/std/uni.d
+++ b/std/uni.d
@@ -2877,7 +2877,8 @@ private:
         alias Ival = CodepointInterval;
         //intervals wrapper for a _range_ over packed array
         auto ivals = Intervals!(typeof(data[]))(data[]);
-        //@@@BUG@@@ can't use "a.a < b.a" see issue 12265
+        //@@@BUG@@@ can't use "a.a < b.a" see
+        // https://issues.dlang.org/show_bug.cgi?id=12265
         sort!((a,b) => a.a < b.a, SwapStrategy.stable)(ivals);
         // what follows is a variation on stable remove
         // differences:
@@ -3733,7 +3734,7 @@ pure @safe unittest// iteration & opIndex
                 [tuple(cast(uint)'A', cast(uint)'N'), tuple(cast(uint)'a', cast(uint)'n')]
             ), text(a.byInterval));
 
-        // same @@@BUG as in issue 8949 ?
+        // same @@@BUG as in https://issues.dlang.org/show_bug.cgi?id=8949 ?
         version (bug8949)
         {
             import std.range : retro;
@@ -8098,12 +8099,12 @@ if (isForwardRange!S1 && isSomeChar!(ElementEncodingType!S1)
     assert(icmp("ᾩ -> \u1F70\u03B9", "\u1F61\u03B9 -> ᾲ") == 0);
     assert(icmp("ΐ"w, "\u03B9\u0308\u0301") == 0);
     assert(sicmp("ΐ", "\u03B9\u0308\u0301") != 0);
-    //bugzilla 11057
+    // https://issues.dlang.org/show_bug.cgi?id=11057
     assert( icmp("K", "L") < 0 );
     });
 }
 
-// issue 17372
+// https://issues.dlang.org/show_bug.cgi?id=17372
 @safe pure unittest
 {
     import std.algorithm.iteration : joiner, map;
@@ -8869,7 +8870,8 @@ else
 {
     import std.internal.unicode_tables; // : toLowerTable, toTitleTable, toUpperTable; // generated file
 
-    // hide template instances behind functions (Bugzilla 13232)
+    // hide template instances behind functions
+    // https://issues.dlang.org/show_bug.cgi?id=13232
     ushort toLowerIndex(dchar c) { return toLowerIndexTrie[c]; }
     ushort toLowerSimpleIndex(dchar c) { return toLowerSimpleIndexTrie[c]; }
     dchar toLowerTab(size_t idx) { return toLowerTable[idx]; }
@@ -9043,7 +9045,8 @@ if (isSomeString!S || (isRandomAccessRange!S && hasLength!S && hasSlicing!S && i
         return s.array;
 }
 
-@safe unittest //12428
+// https://issues.dlang.org/show_bug.cgi?id=12428
+@safe unittest
 {
     import std.array : replicate;
     auto s = "abcdefghij".replicate(300);
@@ -9054,7 +9057,8 @@ if (isSomeString!S || (isRandomAccessRange!S && hasLength!S && hasSlicing!S && i
     assert(s == "abcdefghij");
 }
 
-@safe unittest // 18993
+// https://issues.dlang.org/show_bug.cgi?id=18993
+@safe unittest
 {
     static assert(`몬스터/A`.toLower.length == `몬스터/a`.toLower.length);
 }
@@ -9877,7 +9881,7 @@ if (isSomeString!S || (isRandomAccessRange!S && hasLength!S && hasSlicing!S && i
     assert("\u00df".toUpper == "SS");
 }
 
-//bugzilla 9629
+// https://issues.dlang.org/show_bug.cgi?id=9629
 @safe unittest
 {
     wchar[] test = "hello þ world"w.dup;
@@ -9927,11 +9931,12 @@ if (isSomeString!S || (isRandomAccessRange!S && hasLength!S && hasSlicing!S && i
     assert(toLower("Some String"w) == "some string"w);
     assert(toLower("Some String"d) == "some string"d);
 
-    // bugzilla 12455
+    // https://issues.dlang.org/show_bug.cgi?id=12455
     dchar c = 'İ'; // '\U0130' LATIN CAPITAL LETTER I WITH DOT ABOVE
     assert(isUpper(c));
     assert(toLower(c) == 'i');
-    // extend on 12455 reprot - check simple-case toUpper too
+    // extends on https://issues.dlang.org/show_bug.cgi?id=12455 report
+    // check simple-case toUpper too
     c = '\u1f87';
     assert(isLower(c));
     assert(toUpper(c) == '\u1F8F');
diff --git a/std/utf.d b/std/utf.d
index 72c791c7b93..1dea9f7723e 100644
--- a/std/utf.d
+++ b/std/utf.d
@@ -91,7 +91,8 @@ class UTFException : UnicodeException
         return this;
     }
 
-    // FIXME: Use std.exception.basicExceptionCtors here once bug #11500 is fixed
+    // FIXME: Use std.exception.basicExceptionCtors here once
+    // https://issues.dlang.org/show_bug.cgi?id=11500 is fixed
 
     /**
     Standard exception constructors.
@@ -1215,9 +1216,11 @@ do
     }
     else
     {
-        //@@@BUG@@@ 14447 forces canIndex to be done outside of decodeImpl, which
-        //is undesirable, since not all overloads of decodeImpl need it. So, it
-        //should be moved back into decodeImpl once bug# 8521 has been fixed.
+        // https://issues.dlang.org/show_bug.cgi?id=14447 forces canIndex to be
+        // done outside of decodeImpl, which is undesirable, since not all
+        // overloads of decodeImpl need it. So, it should be moved back into
+        // decodeImpl once https://issues.dlang.org/show_bug.cgi?id=8521
+        // has been fixed.
         enum canIndex = isRandomAccessRange!S && hasSlicing!S && hasLength!S;
         immutable retval = decodeImpl!(canIndex, useReplacementDchar)(cast(TypeForDecode!S) str, numCodeUnits);
 
@@ -1472,7 +1475,8 @@ if (
     else
         alias pstr = str;
 
-    //@@@BUG@@@ 14447 forces this to be done outside of decodeImpl
+    // https://issues.dlang.org/show_bug.cgi?id=14447 forces this to be done
+    // outside of decodeImpl
     //enum canIndex = is(S : const char[]) || (isRandomAccessRange!S && hasSlicing!S && hasLength!S);
 
     static if (canIndex)
@@ -1688,7 +1692,8 @@ if (is(S : const wchar[]) || (isInputRange!S && is(Unqual!(ElementEncodingType!S
     else
         alias pstr = str;
 
-    //@@@BUG@@@ 14447 forces this to be done outside of decodeImpl
+    // https://issues.dlang.org/show_bug.cgi?id=14447 forces this to be done
+    // outside of decodeImpl
     //enum canIndex = is(S : const wchar[]) || (isRandomAccessRange!S && hasSlicing!S && hasLength!S);
 
     static if (canIndex)
@@ -2900,7 +2905,8 @@ if (isSomeString!S)
     assertThrown!UTFException(validate(a));
 }
 
-@safe unittest // bugzilla 12923
+// https://issues.dlang.org/show_bug.cgi?id=12923
+@safe unittest
 {
     import std.exception;
     assertThrown((){
diff --git a/std/variant.d b/std/variant.d
index a53ac441723..b6ccf2cfea8 100644
--- a/std/variant.d
+++ b/std/variant.d
@@ -1279,7 +1279,7 @@ public:
     assert(v[42] == 5);
 }
 
-// opIndex with static arrays, issue 12771
+// opIndex with static arrays, https://issues.dlang.org/show_bug.cgi?id=12771
 @system unittest
 {
     int[4] elements = [0, 1, 2, 3];
@@ -1310,7 +1310,7 @@ public:
     assertThrown!VariantException(v[1] = Variant(null));
 }
 
-//Issue# 10879
+// https://issues.dlang.org/show_bug.cgi?id=10879
 @system unittest
 {
     int[10] arr = [1,2,3,4,5,6,7,8,9,10];
@@ -1336,7 +1336,7 @@ public:
     assert(v3 == ls);
 }
 
-//Issue# 8195
+// https://issues.dlang.org/show_bug.cgi?id=8195
 @system unittest
 {
     struct S
@@ -1356,7 +1356,7 @@ public:
     assert(v == S.init);
 }
 
-// Issue #10961
+// https://issues.dlang.org/show_bug.cgi?id=10961
 @system unittest
 {
     // Primarily test that we can assign a void[] to a Variant.
@@ -1366,7 +1366,7 @@ public:
     assert(returned == elements);
 }
 
-// Issue #13352
+// https://issues.dlang.org/show_bug.cgi?id=13352
 @system unittest
 {
     alias TP = Algebraic!(long);
@@ -1382,7 +1382,7 @@ public:
     assert(a + c == 4L);
 }
 
-// Issue #13354
+// https://issues.dlang.org/show_bug.cgi?id=13354
 @system unittest
 {
     alias A = Algebraic!(string[]);
@@ -1400,14 +1400,14 @@ public:
     assert(aa["b"] == 3);
 }
 
-// Issue #14198
+// https://issues.dlang.org/show_bug.cgi?id=14198
 @system unittest
 {
     Variant a = true;
     assert(a.type == typeid(bool));
 }
 
-// Issue #14233
+// https://issues.dlang.org/show_bug.cgi?id=14233
 @system unittest
 {
     alias Atom = Algebraic!(string, This[]);
@@ -1424,7 +1424,7 @@ pure nothrow @nogc
     a = 1.0;
 }
 
-// Issue 14457
+// https://issues.dlang.org/show_bug.cgi?id=14457
 @system unittest
 {
     alias A = Algebraic!(int, float, double);
@@ -1438,7 +1438,7 @@ pure nothrow @nogc
     assert(a.get!float == 6f);
 }
 
-// Issue 14585
+// https://issues.dlang.org/show_bug.cgi?id=14585
 @system unittest
 {
     static struct S
@@ -1449,7 +1449,7 @@ pure nothrow @nogc
     Variant(S()).get!S;
 }
 
-// Issue 14586
+// https://issues.dlang.org/show_bug.cgi?id=14586
 @system unittest
 {
     const Variant v = new immutable Object;
@@ -1466,7 +1466,7 @@ pure nothrow @nogc
     v.get!S;
 }
 
-// issue 13262
+// https://issues.dlang.org/show_bug.cgi?id=13262
 @system unittest
 {
     static void fun(T)(Variant v){
@@ -1528,7 +1528,7 @@ pure nothrow @nogc
     Algebraic!(SafeS) y;
 }
 
-// issue 19986
+// https://issues.dlang.org/show_bug.cgi?id=19986
 @system unittest
 {
     VariantN!32 v;
@@ -2000,9 +2000,9 @@ deprecated
     static assert(!__traits(compiles, {v > null;}));
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=1558
 @system unittest
 {
-    // bug 1558
     Variant va=1;
     Variant vb=-2;
     assert((va+vb).get!(int) == -1);
@@ -2067,7 +2067,7 @@ deprecated
     assert(v.convertsTo!(char[]));
 }
 
-// http://d.puremagic.com/issues/show_bug.cgi?id=5424
+// https://issues.dlang.org/show_bug.cgi?id=5424
 @system unittest
 {
     interface A {
@@ -2083,14 +2083,14 @@ deprecated
     Variant b = Variant(a);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=7070
 @system unittest
 {
-    // bug 7070
     Variant v;
     v = null;
 }
 
-// Class and interface opEquals, issue 12157
+// Class and interface opEquals, https://issues.dlang.org/show_bug.cgi?id=12157
 @system unittest
 {
     class Foo { }
@@ -2108,7 +2108,7 @@ deprecated
     assert(v2 == f2);
 }
 
-// Const parameters with opCall, issue 11361.
+// Const parameters with opCall, https://issues.dlang.org/show_bug.cgi?id=11361
 @system unittest
 {
     static string t1(string c) {
@@ -2139,7 +2139,7 @@ deprecated
     assert(v3(4).type == typeid(char[]));
 }
 
-// issue 12071
+// https://issues.dlang.org/show_bug.cgi?id=12071
 @system unittest
 {
     static struct Structure { int data; }
@@ -2156,7 +2156,8 @@ deprecated
     assert(called);
 }
 
-// Ordering comparisons of incompatible types, e.g. issue 7990.
+// Ordering comparisons of incompatible types
+// e.g. https://issues.dlang.org/show_bug.cgi?id=7990
 @system unittest
 {
     import std.exception : assertThrown;
@@ -2168,7 +2169,8 @@ deprecated
     assertThrown!VariantException(Variant(3) < Variant.init);
 }
 
-// Handling of unordered types, e.g. issue 9043.
+// Handling of unordered types
+// https://issues.dlang.org/show_bug.cgi?id=9043
 @system unittest
 {
     import std.exception : assertThrown;
@@ -2181,7 +2183,8 @@ deprecated
     assertThrown!VariantException(Variant(A(3)) < Variant(A(4)));
 }
 
-// Handling of empty types and arrays, e.g. issue 10958
+// Handling of empty types and arrays
+// https://issues.dlang.org/show_bug.cgi?id=10958
 @system unittest
 {
     class EmptyClass { }
@@ -2212,7 +2215,8 @@ deprecated
     assert(a.get!EmptyArray == arr);
 }
 
-// Handling of void function pointers / delegates, e.g. issue 11360
+// Handling of void function pointers / delegates
+// https://issues.dlang.org/show_bug.cgi?id=11360
 @system unittest
 {
     static void t1() { }
@@ -2224,7 +2228,8 @@ deprecated
     assert(v2() == 3);
 }
 
-// Using peek for large structs, issue 8580
+// Using peek for large structs
+// https://issues.dlang.org/show_bug.cgi?id=8580
 @system unittest
 {
     struct TestStruct(bool pad)
@@ -2630,9 +2635,9 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     assert(depth(fb) == 3);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=16383
 @system unittest
 {
-    // https://issues.dlang.org/show_bug.cgi?id=16383
     class Foo {this() immutable {}}
     alias V = Algebraic!(immutable Foo);
 
@@ -2642,9 +2647,9 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     assert(x == 3);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=5310
 @system unittest
 {
-    // http://d.puremagic.com/issues/show_bug.cgi?id=5310
     const Variant a;
     assert(a == a);
     Variant b;
@@ -2658,9 +2663,9 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     assert(a[0] == 2);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=10017
 @system unittest
 {
-    // http://d.puremagic.com/issues/show_bug.cgi?id=10017
     static struct S
     {
         ubyte[Variant.size + 1] s;
@@ -2671,10 +2676,11 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     v2 = v1;  // AssertError: target must be non-null
     assert(v1 == v2);
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=7069
 @system unittest
 {
     import std.exception : assertThrown;
-    // http://d.puremagic.com/issues/show_bug.cgi?id=7069
     Variant v;
 
     int i = 10;
@@ -2833,11 +2839,11 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     }
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=12540
 @system unittest
 {
     static struct DummyScope
     {
-        // https://d.puremagic.com/issues/show_bug.cgi?id=12540
         alias Alias12540 = Algebraic!Class12540;
 
         static class Class12540
@@ -2895,7 +2901,7 @@ if (isAlgebraic!VariantType && Handler.length > 0)
 
 @system unittest
 {
-    // Bugzilla 13300
+    // https://issues.dlang.org/show_bug.cgi?id=13300
     static struct S
     {
         this(this) {}
@@ -2923,9 +2929,9 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     auto a = appender!(T[]);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=13871
 @system unittest
 {
-    // Bugzilla 13871
     alias A = Algebraic!(int, typeof(null));
     static struct B { A value; }
     alias C = std.variant.Algebraic!B;
@@ -2962,9 +2968,9 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     assertThrown!VariantException(v.length);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=13534
 @system unittest
 {
-    // Bugzilla 13534
     static assert(!__traits(compiles, () @safe {
         auto foo() @system { return 3; }
         auto v = Variant(&foo);
@@ -2972,9 +2978,9 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     }));
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=15039
 @system unittest
 {
-    // Bugzilla 15039
     import std.typecons;
     import std.variant;
 
@@ -2990,9 +2996,9 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     );
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=15791
 @system unittest
 {
-    // Bugzilla 15791
     int n = 3;
     struct NS1 { int foo() { return n + 10; } }
     struct NS2 { int foo() { return n * 10; } }
@@ -3004,16 +3010,16 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     assert(v.get!NS2.foo() == 30);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=15827
 @system unittest
 {
-    // Bugzilla 15827
     static struct Foo15827 { Variant v; this(Foo15827 v) {} }
     Variant v = Foo15827.init;
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=18934
 @system unittest
 {
-    // Bugzilla 18934
     static struct S
     {
         const int x;
@@ -3029,9 +3035,9 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     assert(v.get!S.x == 2);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=19200
 @system unittest
 {
-    // Bugzilla 19200
     static struct S
     {
         static int opBinaryRight(string op : "|", T)(T rhs)
@@ -3046,9 +3052,9 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     assert(b == 3);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=11061
 @system unittest
 {
-    // Bugzilla 11061
     int[4] el = [0, 1, 2, 3];
     int[3] nl = [0, 1, 2];
     Variant v1 = el;
@@ -3062,9 +3068,9 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     assert(v1 == [0, 1] ~ [2, 3]); // Compare Var(dynamic) to dynamic
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=15940
 @system unittest
 {
-    // Bugzilla 15940
     class C { }
     struct S
     {
@@ -3089,9 +3095,9 @@ if (isAlgebraic!VariantType && Handler.length > 0)
     assert(v == [0,1]);
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=19994
 @safe unittest
 {
-    // Bugzilla 19994
     alias Inner = Algebraic!(This*);
     alias Outer = Algebraic!(Inner, This*);
 
diff --git a/std/windows/registry.d b/std/windows/registry.d
index d43827559d5..cdf37c11cf6 100644
--- a/std/windows/registry.d
+++ b/std/windows/registry.d
@@ -524,7 +524,7 @@ do
 
     REG_VALUE_TYPE type;
 
-    // See bugzilla 961 on this
+    // See https://issues.dlang.org/show_bug.cgi?id=961 on this
     union U
     {
         uint    dw;
diff --git a/std/xml.d b/std/xml.d
index 389a299a9a2..413e475b013 100644
--- a/std/xml.d
+++ b/std/xml.d
@@ -1319,7 +1319,8 @@ class Comment : Item
     override @property @safe @nogc pure nothrow scope bool isEmptyXML() const { return false; } /// Returns false always
 }
 
-@safe unittest // issue 16241
+// https://issues.dlang.org/show_bug.cgi?id=16241
+@safe unittest
 {
     import std.exception : assertThrown;
     auto c = new Comment("==");
@@ -2097,8 +2098,8 @@ class ElementParser
                 {
                     Tag startTag = new Tag(tag_.name);
 
-                    // FIX by hed010gy, for bug 2979
-                    // http://d.puremagic.com/issues/show_bug.cgi?id=2979
+                    // FIX by hed010gy
+                    // https://issues.dlang.org/show_bug.cgi?id=2979
                     if (tag_.attr.length > 0)
                           foreach (tn,tv; tag_.attr) startTag.attr[tn]=tv;
                     // END FIX
diff --git a/std/zip.d b/std/zip.d
index b7c1a14f1f0..4d7422bdd1c 100644
--- a/std/zip.d
+++ b/std/zip.d
@@ -611,7 +611,7 @@ public:
         _directory.remove(de.name);
     }
 
-    // issue 20398
+    // https://issues.dlang.org/show_bug.cgi?id=20398
     @safe unittest
     {
         import std.string : representation;
@@ -1609,7 +1609,8 @@ the quick brown fox jumps over the lazy dog\r
 
 @system unittest
 {
-    // issue #20239: chameleon file, containing two valid end of central directory entries
+    // https://issues.dlang.org/show_bug.cgi?id=20239
+    // chameleon file, containing two valid end of central directory entries
     auto file =
         "\x50\x4B\x03\x04\x0A\x00\x00\x00\x00\x00\x89\x36\x39\x4F\x04\x6A\xB3\xA3\x01\x00"~
         "\x00\x00\x01\x00\x00\x00\x0D\x00\x1C\x00\x62\x65\x73\x74\x5F\x6C\x61\x6E\x67\x75"~
@@ -1636,7 +1637,8 @@ the quick brown fox jumps over the lazy dog\r
 
 @system unittest
 {
-    // issue #20287: check for correct compressed data
+    // https://issues.dlang.org/show_bug.cgi?id=20287
+    // check for correct compressed data
     auto file =
         "\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00\x8f\x72\x4a\x4f\x86\xa6"~
         "\x10\x36\x05\x00\x00\x00\x05\x00\x00\x00\x04\x00\x1c\x00\x66\x69"~
@@ -1654,7 +1656,7 @@ the quick brown fox jumps over the lazy dog\r
     assert(za.directory["file"].compressedData == [104, 101, 108, 108, 111]);
 }
 
-// issue #20027
+// https://issues.dlang.org/show_bug.cgi?id=20027
 @system unittest
 {
     // central file header overlaps end of central directory
@@ -1694,7 +1696,8 @@ the quick brown fox jumps over the lazy dog\r
 
 @system unittest
 {
-    // issue #20295: zip64 with 0xff bytes in end of central dir record do not work
+    // https://issues.dlang.org/show_bug.cgi?id=20295
+    // zip64 with 0xff bytes in end of central dir record do not work
     // minimum (empty zip64) archive should pass
     auto file =
         "\x50\x4b\x06\x06\x2c\x00\x00\x00\x00\x00\x00\x00\x1e\x03\x2d\x00"~
diff --git a/std/zlib.d b/std/zlib.d
index bd2fe37ebec..beb280f891d 100644
--- a/std/zlib.d
+++ b/std/zlib.d
@@ -664,7 +664,8 @@ class UnCompress
         return destbuf;
     }
 
-    // Test for issues 3191 and 9505
+    // Test for https://issues.dlang.org/show_bug.cgi?id=3191 and
+    // https://issues.dlang.org/show_bug.cgi?id=9505
     @system unittest
     {
         import std.algorithm.comparison;
@@ -880,7 +881,8 @@ import std.stdio;
     assert( output[] == input[] );
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=15457
 @system unittest
 {
-    static assert(__traits(compiles, etc.c.zlib.gzclose(null)));        // bugzilla 15457
+    static assert(__traits(compiles, etc.c.zlib.gzclose(null)));
 }