go source for verification 2026-05-22

test/fixedbugs/issue20923.go

@@ -0,0 +1,19 @@
+// compile
+
+// 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.
+
+// Issue 20923: gccgo failed to compile parenthesized select case expressions.
+
+package p
+
+func F(c chan bool) {
+	select {
+	case (<-c):
+	case _ = (<-c):
+	case _, _ = (<-c):
+	case (c) <- true:
+	default:
+	}
+}