diff --git a/std/experimental/typecons.d b/std/experimental/typecons.d
index d55e4ec9fe0..c80edb12617 100644
--- a/std/experimental/typecons.d
+++ b/std/experimental/typecons.d
@@ -111,8 +111,12 @@ if (Targets.length >= 1 && allSatisfy!(isMutable, Targets))
             else
             {
                 enum foundFunc = findCovariantFunction!(TargetMembers[i], Source, SourceMembers);
-                static if (foundFunc == -1)
-                    pragma(msg, "Could not locate matching function for: " ~ TargetMembers[i].stringof);
+                debug
+                {
+                    static if (foundFunc == -1)
+                        pragma(msg, "Could not locate matching function for: ",
+                               TargetMembers[i].stringof);
+                }
                 enum hasRequiredMethods =
                     foundFunc != -1 &&
                     hasRequiredMethods!(i + 1);
diff --git a/std/math.d b/std/math.d
index 023400d562b..8b50aa4eef8 100644
--- a/std/math.d
+++ b/std/math.d
@@ -7495,15 +7495,13 @@ if (isFloatingPoint!(F) && isIntegral!(G))
 
     assert(pow(x, neg1) == 1 / x);
 
-    version (X86_64)
-    {
-        pragma(msg, "test disabled on x86_64, see bug 5628");
-    }
-    else version (ARM)
-    {
-        pragma(msg, "test disabled on ARM, see bug 5628");
-    }
-    else
+    // Test disabled on most targets.
+    // See https://issues.dlang.org/show_bug.cgi?id=5628
+    version (X86_64)   enum BUG5628 = false;
+    else version (ARM) enum BUG5628 = false;
+    else               enum BUG5628 = true;
+
+    static if (BUG5628)
     {
         assert(pow(xd, neg2) == 1 / (x * x));
         assert(pow(xf, neg8) == 1 / ((x * x) * (x * x) * (x * x) * (x * x)));