mirror of
https://github.com/golang/go
synced 2024-11-24 21:30:10 -07:00
fcc10bc0f1
The lowering to runtime calls introduces hidden pointers to the arguments of select clauses. When implicit conversions were involved it could end up with incompatible pointers. Since the pointed-to types have the same representation, we can introduce a forced conversion. Fixes #6847. LGTM=rsc R=rsc, iant, khr CC=golang-codereviews https://golang.org/cl/72380043
86 lines
1.2 KiB
Go
86 lines
1.2 KiB
Go
// compile
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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 6847: select clauses involving implicit conversion
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// of channels trigger a spurious typechecking error during walk.
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package p
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type I1 interface {
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String()
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}
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type I2 interface {
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String()
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}
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func F() {
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var (
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cr <-chan int
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cs chan<- int
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c chan int
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ccr chan (<-chan int)
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ccs chan chan<- int
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cc chan chan int
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ok bool
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)
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// Send cases.
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select {
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case ccr <- cr:
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case ccr <- c:
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}
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select {
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case ccs <- cs:
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case ccs <- c:
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}
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select {
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case ccr <- c:
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default:
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}
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// Receive cases.
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select {
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case cr = <-cc:
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case cs = <-cc:
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case c = <-cc:
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}
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select {
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case cr = <-cc:
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default:
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}
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select {
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case cr, ok = <-cc:
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case cs, ok = <-cc:
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case c = <-cc:
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}
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// Interfaces.
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var (
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c1 chan I1
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c2 chan I2
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x1 I1
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x2 I2
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)
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select {
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case c1 <- x1:
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case c1 <- x2:
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case c2 <- x1:
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case c2 <- x2:
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}
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select {
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case x1 = <-c1:
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case x1 = <-c2:
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case x2 = <-c1:
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case x2 = <-c2:
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}
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select {
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case x1, ok = <-c1:
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case x1, ok = <-c2:
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case x2, ok = <-c1:
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case x2, ok = <-c2:
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}
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_ = ok
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}
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