golang issue20923 代码
文件路径：/test/fixedbugs/issue20923.go
/ 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:
}
}