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master
test/fixedbugs/issue24817.go
64 строки
1 KB
Josh Bleecher Snyder
cmd/compile: fix evaluation of "" < s
12 апр 2018, 22:38
12 апр 2018, 22:38
c1ed1f3
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// run // Copyright 2018 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. // Check all ways to compare a non-constant string to the empty string. package main import ( "fmt" "os" ) var ( s = "abc" e = "" failed bool ) func main() { want(true, "" < s, `"" < s`) want(false, s < "", `s < ""`) want(false, "" < e, `"" < e`) want(false, e < "", `e < ""`) want(true, "" <= s, `"" <= s`) want(false, s <= "", `s <= ""`) want(true, "" <= e, `"" <= e`) want(true, e <= "", `e <= ""`) want(false, "" > s, `"" > s`) want(true, s > "", `s > ""`) want(false, "" > e, `"" > e`) want(false, e > "", `e > ""`) want(false, "" >= s, `"" >= s`) want(true, s >= "", `s >= ""`) want(true, "" >= e, `"" >= e`) want(true, e >= "", `e >= ""`) want(false, "" == s, `"" == s`) want(false, s == "", `s == ""`) want(true, "" == e, `"" == e`) want(true, e == "", `e == ""`) want(true, "" != s, `"" != s`) want(true, s != "", `s != ""`) want(false, "" != e, `"" != e`) want(false, e != "", `e != ""`) if failed { os.Exit(1) } } //go:noinline func want(b bool, have bool, msg string) { if b != have { fmt.Println(msg) failed = true } }