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Normally, an expression of the form x.f or *y can be reordered with function calls and communications. Select is stricter than normal: each channel expression is evaluated in source order. If you have case <-x.f and case <-foo(), then if the evaluation of x.f causes a panic, foo must not have been called. (This is in contrast to an expression like x.f + foo().) Enforce this stricter ordering. Fixes #8336. LGTM=dvyukov R=golang-codereviews, dvyukov CC=golang-codereviews, r https://golang.org/cl/126570043
30 lines
516 B
Go
30 lines
516 B
Go
// run
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// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 8336. Order of evaluation of receive channels in select.
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package main
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type X struct {
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c chan int
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}
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func main() {
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defer func() {
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recover()
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}()
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var x *X
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select {
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case <-x.c: // should fault and panic before foo is called
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case <-foo():
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}
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}
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func foo() chan int {
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println("BUG: foo must not be called")
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return make(chan int)
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}
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