golang f 代码
文件路径：/src/go/doc/testdata/f.go
// Copyright 2012 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.
// The package f is a go/doc test for functions and factory methods.
package f
// ----------------------------------------------------------------------------
// Factory functions for non-exported types must not get lost.
type private struct{}
// Exported must always be visible. Was issue 2824.
func Exported() private {}