mirror of
https://github.com/golang/go
synced 2024-11-17 22:54:48 -07:00
53fd522c0d
Follows suit with https://go-review.googlesource.com/#/c/20111. Generated by running $ grep -R 'Go Authors. All' * | cut -d":" -f1 | while read F;do perl -pi -e 's/Go Authors. All/Go Authors. All/g' $F;done The code in cmd/internal/unvendor wasn't changed. Fixes #15213 Change-Id: I4f235cee0a62ec435f9e8540a1ec08ae03b1a75f Reviewed-on: https://go-review.googlesource.com/21819 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
72 lines
1.4 KiB
Go
72 lines
1.4 KiB
Go
// run
|
|
|
|
// Copyright 2015 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.
|
|
|
|
// Ensure that zeroing range loops have the requisite side-effects.
|
|
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
)
|
|
|
|
func check(n int) {
|
|
// When n == 0, i is untouched by the range loop.
|
|
// Picking an initial value of -1 for i makes the
|
|
// "want" calculation below correct in all cases.
|
|
i := -1
|
|
s := make([]byte, n)
|
|
for i = range s {
|
|
s[i] = 0
|
|
}
|
|
if want := n - 1; i != want {
|
|
fmt.Printf("index after range with side-effect = %d want %d\n", i, want)
|
|
os.Exit(1)
|
|
}
|
|
|
|
i = n + 1
|
|
// i is shadowed here, so its value should be unchanged.
|
|
for i := range s {
|
|
s[i] = 0
|
|
}
|
|
if want := n + 1; i != want {
|
|
fmt.Printf("index after range without side-effect = %d want %d\n", i, want)
|
|
os.Exit(1)
|
|
}
|
|
|
|
// Index variable whose evaluation has side-effects
|
|
var x int
|
|
f := func() int {
|
|
x++
|
|
return 0
|
|
}
|
|
var a [1]int
|
|
for a[f()] = range s {
|
|
s[a[f()]] = 0
|
|
}
|
|
if want := n * 2; x != want {
|
|
fmt.Printf("index function calls = %d want %d\n", x, want)
|
|
os.Exit(1)
|
|
}
|
|
|
|
// Range expression whose evaluation has side-effects
|
|
x = 0
|
|
b := [1][]byte{s}
|
|
for i := range b[f()] {
|
|
b[f()][i] = 0
|
|
}
|
|
if want := n + 1; x != n+1 {
|
|
fmt.Printf("range expr function calls = %d want %d\n", x, want)
|
|
os.Exit(1)
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
check(0)
|
|
check(1)
|
|
check(15)
|
|
}
|