go source for verification 2026-05-22

test/fixedbugs/issue41575.go

@@ -0,0 +1,36 @@
+// errorcheck
+
+// Copyright 2020 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 p
+
+type T1 struct { // ERROR "invalid recursive type T1\n.*T1 refers to T2\n.*T2 refers to T1|invalid recursive type"
+	f2 T2
+}
+
+type T2 struct { // GCCGO_ERROR "invalid recursive type"
+	f1 T1
+}
+
+type a b // GCCGO_ERROR "invalid recursive type"
+type b c // ERROR "invalid recursive type b\n.*b refers to c\n.*c refers to b|invalid recursive type|invalid recursive type"
+type c b // GCCGO_ERROR "invalid recursive type"
+
+type d e
+type e f
+type f f // ERROR "invalid recursive type: f refers to itself|invalid recursive type|invalid recursive type"
+
+type g struct { // ERROR "invalid recursive type: g refers to itself|invalid recursive type"
+	h struct {
+		g
+	}
+}
+
+type w x
+type x y           // ERROR "invalid recursive type x\n.*x refers to y\n.*y refers to z\n.*z refers to x|invalid recursive type"
+type y struct{ z } // GCCGO_ERROR "invalid recursive type"
+type z [10]x
+
+type w2 w // refer to the type loop again