From 68df3c9afd2deb4aa7de17b4355a3eeb5d60f031 Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Thu, 7 Oct 2021 12:01:06 +0200
Subject: [PATCH] fixes a 'mixin' statement handling regression [backport:1.2]
 (#18968)

(cherry picked from commit 8eef55715725a9dba2ff0afbdbb564383f3a29a6)
---
 compiler/semtempl.nim | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/compiler/semtempl.nim b/compiler/semtempl.nim
index 504a55fbfc947..458956196391f 100644
--- a/compiler/semtempl.nim
+++ b/compiler/semtempl.nim
@@ -110,9 +110,14 @@ proc semBindStmt(c: PContext, n: PNode, toBind: var IntSet): PNode =
 
 proc semMixinStmt(c: PContext, n: PNode, toMixin: var IntSet): PNode =
   result = copyNode(n)
+  var count = 0
   for i in 0..<n.len:
     toMixin.incl(considerQuotedIdent(c, n[i]).id)
-    result.add symChoice(c, n[i], nil, scForceOpen)
+    let x = symChoice(c, n[i], nil, scForceOpen)
+    inc count, x.len
+    result.add x
+  if count == 0:
+    result = newNodeI(nkEmpty, n.info)
 
 proc replaceIdentBySym(c: PContext; n: var PNode, s: PNode) =
   case n.kind