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master
test/fixedbugs/issue43111.go
70 строк
896 B
Matthew Dempsky
cmd/compile: fix select statement evaluation order corner case
12 дек 2020, 01:02
12 дек 2020, 01:02
1430552
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// run // Copyright 2020 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. package main var ch chan int var x int func f() int { close(ch) ch = nil return 0 } func g() int { ch = nil x = 0 return 0 } func main() { var nilch chan int var v int var ok bool _, _ = v, ok ch = make(chan int) select { case <-ch: case nilch <- f(): } ch = make(chan int) select { case v = <-ch: case nilch <- f(): } ch = make(chan int) select { case v := <-ch: _ = v case nilch <- f(): } ch = make(chan int) select { case v, ok = <-ch: case nilch <- f(): } ch = make(chan int) select { case v, ok := <-ch: _, _ = v, ok case nilch <- f(): } ch1 := make(chan int, 1) ch = ch1 x = 42 select { case ch <- x: case nilch <- g(): } if got := <-ch1; got != 42 { panic(got) } }