golang issue28055 代码
文件路径：/test/fixedbugs/issue28055.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.
/ Make sure VARDEF can be a top-level statement.
package p
func f() {
var s string
var as []string
switch false && (s+"a"+as[0]+s+as[0]+s == "") {
}
}