go source for verification 2026-05-22

test/fixedbugs/issue21253.go

@@ -0,0 +1,27 @@
+// compile
+
+// Copyright 2017 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.
+
+// Gccgo crashed compiling this code due to failing to finalize
+// interfaces in the right order.
+
+package p
+
+type s1 struct {
+	f m
+	I
+}
+
+type m interface {
+	Mm(*s2)
+}
+
+type s2 struct {
+	*s1
+}
+
+type I interface {
+	MI()
+}