From 324f41b748fd87ad4a1cafa458bac3014f2fb5f2 Mon Sep 17 00:00:00 2001
From: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Date: Sun, 3 Nov 2024 15:52:29 +0700
Subject: [PATCH] cmd/compile: fix inlining name mangling for blank label

Fixes #70175

Change-Id: I13767d951455854b03ad6707ff9292cfe9097ee9
Reviewed-on: https://go-review.googlesource.com/c/go/+/624377
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
---
 src/cmd/compile/internal/noder/reader.go |  2 +-
 test/fixedbugs/issue70175.go             | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)
 create mode 100644 test/fixedbugs/issue70175.go

diff --git a/src/cmd/compile/internal/noder/reader.go b/src/cmd/compile/internal/noder/reader.go
index 39ac1400a0..eca66487fa 100644
--- a/src/cmd/compile/internal/noder/reader.go
+++ b/src/cmd/compile/internal/noder/reader.go
@@ -2068,7 +2068,7 @@ func (r *reader) switchStmt(label *types.Sym) ir.Node {
 func (r *reader) label() *types.Sym {
 	r.Sync(pkgbits.SyncLabel)
 	name := r.String()
-	if r.inlCall != nil {
+	if r.inlCall != nil && name != "_" {
 		name = fmt.Sprintf("~%s·%d", name, inlgen)
 	}
 	return typecheck.Lookup(name)
diff --git a/test/fixedbugs/issue70175.go b/test/fixedbugs/issue70175.go
new file mode 100644
index 0000000000..0ad6e39a7f
--- /dev/null
+++ b/test/fixedbugs/issue70175.go
@@ -0,0 +1,17 @@
+// compile
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+func f() {
+_:
+
+_:
+}
+
+func main() {
+	f()
+}
-- 
2.48.1