From 2678fa679ad6bbdec11945e4ca9ba78eab490188 Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Sat, 6 Jul 2019 15:23:57 +0200
Subject: [PATCH] fixes #7057

---
 compiler/lowerings.nim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/lowerings.nim b/compiler/lowerings.nim
index 55917a2f50..3672a2e295 100644
--- a/compiler/lowerings.nim
+++ b/compiler/lowerings.nim
@@ -707,7 +707,7 @@ proc wrapProcForSpawn*(g: ModuleGraph; owner: PSym; spawnExpr: PNode; retType: P
   var fn = n.sons[0]
   # templates and macros are in fact valid here due to the nature of
   # the transformation:
-  if fn.kind == nkClosure:
+  if fn.kind == nkClosure or (fn.typ != nil and fn.typ.callConv == ccClosure):
     localError(g.config, n.info, "closure in spawn environment is not allowed")
   if not (fn.kind == nkSym and fn.sym.kind in {skProc, skTemplate, skMacro,
                                                skFunc, skMethod, skConverter}):