From 24e4099d36b860d26965124aa91c2c0634a10511 Mon Sep 17 00:00:00 2001
From: Bung <crc32@qq.com>
Date: Mon, 19 Dec 2022 19:35:15 +0800
Subject: [PATCH] fix #21109 (#21127)

(cherry picked from commit e278a781fc5bfc115326ed6c1873268d51b25303)
---
 compiler/semexprs.nim |  2 ++
 tests/misc/t21109.nim | 13 +++++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 tests/misc/t21109.nim

diff --git a/compiler/semexprs.nim b/compiler/semexprs.nim
index 8e9d57f045..2ebb66b88e 100644
--- a/compiler/semexprs.nim
+++ b/compiler/semexprs.nim
@@ -1931,6 +1931,8 @@ proc semYieldVarResult(c: PContext, n: PNode, restype: PType) =
             tupleConstr[i] = takeImplicitAddr(c, tupleConstr[i], e.kind == tyLent)
         else:
           localError(c.config, n[0].info, errXExpected, "tuple constructor")
+      elif e.kind == tyEmpty:
+        localError(c.config, n[0].info, errTypeExpected)
   else:
     when false:
       # XXX investigate what we really need here.
diff --git a/tests/misc/t21109.nim b/tests/misc/t21109.nim
new file mode 100644
index 0000000000..0f7980896a
--- /dev/null
+++ b/tests/misc/t21109.nim
@@ -0,0 +1,13 @@
+discard """
+  action: reject
+  errormsg: "type expected"
+  file: "iterators.nim"
+"""
+
+
+template b(j: untyped) = j
+template m() = discard
+
+b:
+  for t, f in @[]:
+    m()