From 9d9bf12e1ca283073d40e5ee817a6411c6f35734 Mon Sep 17 00:00:00 2001
From: flywind <43030857+xflywind@users.noreply.github.com>
Date: Mon, 2 Nov 2020 17:58:14 +0800
Subject: [PATCH] Closure iterators are not supported by VM (#15818)

(cherry picked from commit 5b4c17b5e7166220c7b5c149946579f245f54645)
---
 compiler/vmgen.nim            | 2 ++
 tests/vm/tclosureiterator.nim | 9 +++++++++
 2 files changed, 11 insertions(+)
 create mode 100644 tests/vm/tclosureiterator.nim

diff --git a/compiler/vmgen.nim b/compiler/vmgen.nim
index aa8cd43477..21c19c2b19 100644
--- a/compiler/vmgen.nim
+++ b/compiler/vmgen.nim
@@ -1982,6 +1982,8 @@ proc gen(c: PCtx; n: PNode; dest: var TDest; flags: TGenFlags = {}) =
       genRdVar(c, n, dest, flags)
     of skProc, skFunc, skConverter, skMacro, skTemplate, skMethod, skIterator:
       # 'skTemplate' is only allowed for 'getAst' support:
+      if s.kind == skIterator and s.typ.callConv == TCallingConvention.ccClosure:
+        globalError(c.config, n.info, "Closure iterators are not supported by VM!")
       if procIsCallback(c, s): discard
       elif importcCond(s): c.importcSym(n.info, s)
       genLit(c, n, dest)
diff --git a/tests/vm/tclosureiterator.nim b/tests/vm/tclosureiterator.nim
new file mode 100644
index 0000000000..c909392d55
--- /dev/null
+++ b/tests/vm/tclosureiterator.nim
@@ -0,0 +1,9 @@
+discard """
+  errormsg: "Closure iterators are not supported by VM!"
+"""
+
+iterator iter*(): int {.closure.} =
+  yield 3
+
+static:
+  var x = iter