go source for verification 2026-05-22

test/fixedbugs/issue26094.go

@@ -0,0 +1,49 @@
+// 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.
+
+package main
+
+import "strings"
+
+var X interface{}
+
+type T struct{}
+
+func scopes() {
+	p, ok := recover().(error)
+	if ok && strings.Contains(p.Error(), "different scopes") {
+		return
+	}
+	panic(p)
+}
+
+func F1() {
+	type T struct{}
+	X = T{}
+}
+
+func F2() {
+	type T struct{}
+	defer scopes()
+	_ = X.(T)
+}
+
+func F3() {
+	defer scopes()
+	_ = X.(T)
+}
+
+func F4() {
+	X = T{}
+}
+
+func main() {
+	F1() // set X to F1's T
+	F2() // check that X is not F2's T
+	F3() // check that X is not package T
+	F4() // set X to package T
+	F2() // check that X is not F2's T
+}