golang go11 代码
文件路径：/src/cmd/go/go11.go
/ Copyright 2013 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.
/go:build go1.1
package main
/ Test that go1.1 tag above is included in builds. main.go refers to this definition.
const go11tag = true