golang import4 代码
文件路径：/test/import4.dir/import4.go
/ 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.
/ Verify that various kinds of "imported and not used"
/ errors are caught by the compiler.
/ Does not compile.
package main
/ standard
import "fmt" / ERROR "imported and not used.*fmt"
/ renamed
import X "math" / ERROR "imported and not used.*math"
/ import dot
import . "bufio" / ERROR "imported and not used.*bufio"
/ again, package without anything in it
import "./empty" / ERROR "imported and not used.*empty"
import Z "./empty" / ERROR "imported and not used.*empty"
import . "./empty" / ERROR "imported and not used.*empty"