go source for verification 2026-05-22

test/fixedbugs/bug199.go

@@ -0,0 +1,27 @@
+// run
+
+// Copyright 2009 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
+
+type S struct {
+	a []int
+}
+
+var s = &S{make([]int, 10)}
+
+func main() {
+	s.a[f()] = 1 // 6g used to call f twice here
+}
+
+var n int
+
+func f() int {
+	if n++; n > 1 {
+		println("f twice")
+		panic("fail")
+	}
+	return 0
+}