go source for verification 2026-05-22

test/fixedbugs/issue19977.go

@@ -0,0 +1,16 @@
+// errorcheck
+
+// 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.
+
+// Issue 19977: multiple error messages when type switching on an undefined
+
+package foo
+
+func Foo() {
+	switch x := a.(type) { // ERROR "undefined: a|reference to undefined name .*a"
+	default:
+		_ = x
+	}
+}