commented out map2 to focus this PR on lambda addition only

lib/pure/collections/sequtils.nim

@@ -640,34 +640,35 @@ template foldr*(sequence, operation: untyped): untyped =
     result = operation
   result
 
-template map2*(s, lambda: untyped): untyped =
-  ## like ``mapIt`` but with cleaner syntax: ``[1,2].mapIt(a => a*10)``
-  runnableExamples:
-    doAssert [1,2].map2(a=>a*10) == @[10,20]
-    let foo=3
-    doAssert [1,2].map2(a=>a*foo) == @[3,6]
-  makeLambda(lambda, lambda2)
-  type outType = type((
-    block:
-      var it: type(items(s))
-      lambda2(it)
-      ))
-
-  when compiles(s.len):
-    var result: seq[outType]
-    block:
-      evalOnceAs(s2, s, compiles((let _ = s)))
-      var i = 0
-      var result = newSeq[outType](s2.len)
-      for it in s2:
-        result[i] = lambda2(it)
-        i += 1
+when false:
+  template map2*(s, lambda: untyped): untyped =
+    ## like ``mapIt`` but with cleaner syntax: ``[1,2].mapIt(a => a*10)``
+    runnableExamples:
+      doAssert [1,2].map2(a=>a*10) == @[10,20]
+      let foo=3
+      doAssert [1,2].map2(a=>a*foo) == @[3,6]
+    makeLambda(lambda, lambda2)
+    type outType = type((
+      block:
+        var it: type(items(s))
+        lambda2(it)
+        ))
+
+    when compiles(s.len):
+      var result: seq[outType]
+      block:
+        evalOnceAs(s2, s, compiles((let _ = s)))
+        var i = 0
+        var result = newSeq[outType](s2.len)
+        for it in s2:
+          result[i] = lambda2(it)
+          i += 1
+        result
+    else:
+      var result: seq[outType] = @[]
+      for it in s:
+        result.add lambda2(it)
       result
-  else:
-    var result: seq[outType] = @[]
-    for it in s:
-      result.add lambda2(it)
-    result
 
 template mapIt*(s, typ, op: untyped): untyped =
   ## Convenience template around the ``map`` proc to reduce typing.
@@ -1170,5 +1171,6 @@ when isMainModule:
     echo "Finished doc tests"
 
   block map2Test:
-    # PENDING https://github.com/nim-lang/Nim/issues/7280
-    discard [1].map2(a => a)
+    when false:
+      # PENDING https://github.com/nim-lang/Nim/issues/7280
+      discard [1].map2(a => a)