From 4728c52c787b19c60a5533e20b7d71ee9ca137a3 Mon Sep 17 00:00:00 2001
From: Bung <crc32@qq.com>
Date: Tue, 25 Oct 2022 14:43:14 +0800
Subject: [PATCH] =?UTF-8?q?fix=20#12094=20Use=20of=20=5F=20(as=20var=20pla?=
 =?UTF-8?q?ceholder)=20inside=20a=20template=20causes=20XDe=E2=80=A6=20(#2?=
 =?UTF-8?q?0635)?=
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fix #12094 Use of _ (as var placeholder) inside a template causes XDeclaredButNotUsed
---
 compiler/semstmts.nim | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/compiler/semstmts.nim b/compiler/semstmts.nim
index 596995adb5..81be677252 100644
--- a/compiler/semstmts.nim
+++ b/compiler/semstmts.nim
@@ -370,7 +370,8 @@ proc addToVarSection(c: PContext; result: var PNode; orig, identDefs: PNode) =
     result.add identDefs
 
 proc isDiscardUnderscore(v: PSym): bool =
-  if v.name.s == "_":
+  # template generated underscore symbol name starts with _`gensym
+  if v.name.s == "_" or v.name.s.startsWith("_`"):
     v.flags.incl(sfGenSym)
     result = true