Initial commit: Go 1.23 release state

test/fixedbugs/issue27278.go

@@ -0,0 +1,63 @@
+// run
+
+// Copyright 2018 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.
+
+// Issue 27278: dead auto elim deletes an auto and its
+// initialization, but it is live because of a nil check.
+
+package main
+
+type T struct {
+	_ [3]string
+	T2
+}
+
+func (t *T) M() []string {
+	return t.T2.M()
+}
+
+type T2 struct {
+	T3
+}
+
+func (t *T2) M() []string {
+	return t.T3.M()
+}
+
+type T3 struct {
+	a string
+}
+
+func (t *T3) M() []string {
+	return []string{}
+}
+
+func main() {
+	poison()
+	f()
+}
+
+//go:noinline
+func f() {
+	(&T{}).M()
+	grow(10000)
+}
+
+// grow stack, triggers stack copy
+func grow(n int) {
+	if n == 0 {
+		return
+	}
+	grow(n-1)
+}
+
+// put some junk on stack, which cannot be valid address
+//go:noinline
+func poison() {
+	x := [10]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
+	g = x
+}
+
+var g [10]int