golang import 代码
文件路径：/test/import.go
/ compile
/ Copyright 2009 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.
/ Test that when import gives multiple names
/ to a single type, they still all refer to the same type.
package main
import _os_ "os"
import "os"
import . "os"
func f(e *os.File)
func main() {
var _e_ *_os_.File
var dot *File
f(_e_)
f(dot)
}