From 7c11da3f221feeff7029d8802cda0536fc5ab5f0 Mon Sep 17 00:00:00 2001
From: ringabout <43030857+ringabout@users.noreply.github.com>
Date: Thu, 14 Mar 2024 18:12:29 +0800
Subject: [PATCH] fixes #23382; gives compiler errors for closure iterators in
 JS (#23398)

fixes #23382
follow up https://github.com/nim-lang/Nim/pull/15823
---
 compiler/jsgen.nim | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compiler/jsgen.nim b/compiler/jsgen.nim
index ffc11789f9..37db6f74f7 100644
--- a/compiler/jsgen.nim
+++ b/compiler/jsgen.nim
@@ -2959,7 +2959,9 @@ proc gen(p: PProc, n: PNode, r: var TCompRes) =
     let s = n[namePos].sym
     discard mangleName(p.module, s)
     r.res = s.loc.r
-    if lfNoDecl in s.loc.flags or s.magic notin generatedMagics: discard
+    if s.kind == skIterator and s.typ.callConv == TCallingConvention.ccClosure:
+      globalError(p.config, n.info, "Closure iterators are not supported by JS backend!")
+    elif lfNoDecl in s.loc.flags or s.magic notin generatedMagics: discard
     elif not p.g.generatedSyms.containsOrIncl(s.id):
       p.locals.add(genProc(p, s))
   of nkType: r.res = genTypeInfo(p, n.typ)