/usr/share/go-1.6/test/blank.go is in golang-1.6-src 1.6.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 | // run
// 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 behavior of the blank identifier (_).
package main
import (
"os"
"unsafe"
)
import _ "fmt"
var call string
type T struct {
_, _, _ int
}
func (T) _() {
}
func (T) _() {
}
type U struct {
_ struct{ a, b, c int }
}
const (
c0 = iota
_
_
_
c4
)
var ints = []string{
"1",
"2",
"3",
}
func f() (int, int) {
call += "f"
return 1, 2
}
func g() (float64, float64) {
call += "g"
return 3, 4
}
func h(_ int, _ float64) {
}
func i() int {
call += "i"
return 23
}
var _ = i()
func main() {
if call != "i" {
panic("init did not run")
}
call = ""
_, _ = f()
a, _ := f()
if a != 1 {
panic(a)
}
b, _ := g()
if b != 3 {
panic(b)
}
_, a = f()
if a != 2 {
panic(a)
}
_, b = g()
if b != 4 {
panic(b)
}
_ = i()
if call != "ffgfgi" {
panic(call)
}
if c4 != 4 {
panic(c4)
}
out := ""
for _, s := range ints {
out += s
}
if out != "123" {
panic(out)
}
sum := 0
for s := range ints {
sum += s
}
if sum != 3 {
panic(sum)
}
// go.tools/ssa/interp cannot support unsafe.Pointer.
if os.Getenv("GOSSAINTERP") == "" {
type T1 struct{ x, y, z int }
t1 := *(*T)(unsafe.Pointer(&T1{1, 2, 3}))
t2 := *(*T)(unsafe.Pointer(&T1{4, 5, 6}))
if t1 != t2 {
panic("T{} != T{}")
}
var u1, u2 interface{}
u1 = *(*U)(unsafe.Pointer(&T1{1, 2, 3}))
u2 = *(*U)(unsafe.Pointer(&T1{4, 5, 6}))
if u1 != u2 {
panic("U{} != U{}")
}
}
h(a, b)
m()
}
type I interface {
M(_ int, y int)
}
type TI struct{}
func (_ TI) M(x int, y int) {
if x != y {
println("invalid M call:", x, y)
panic("bad M")
}
}
var fp = func(_ int, y int) {}
func init() {
fp = fp1
}
func fp1(x, y int) {
if x != y {
println("invalid fp1 call:", x, y)
panic("bad fp1")
}
}
func m() {
var i I
i = TI{}
i.M(1, 1)
i.M(2, 2)
fp(1, 1)
fp(2, 2)
}
// useless but legal
var _ int = 1
var _ = 2
var _, _ = 3, 4
const _ = 3
const _, _ = 4, 5
type _ int
func _() {
panic("oops")
}
func ff() {
var _ int = 1
}
|