fix is "closure" (#16552)

compiler/semexprs.nim

@@ -408,8 +408,7 @@ proc isOpImpl(c: PContext, n: PNode, flags: TExprFlags): PNode =
     of "closure":
       let t = skipTypes(t1, abstractRange)
       res = t.kind == tyProc and
-            t.callConv == ccClosure and
-            tfIterator notin t.flags
+            t.callConv == ccClosure
     of "iterator":
       let t = skipTypes(t1, abstractRange)
       res = t.kind == tyProc and

tests/stdlib/thashes.nim

@@ -4,6 +4,15 @@ discard """
 
 import std/hashes
 
+
+when not defined(js) and not defined(cpp):
+  block:
+    var x = 12
+    iterator hello(): int {.closure.} =
+      yield x
+
+    discard hash(hello)
+
 block hashes:
   block hashing:
     var dummy = 0.0