mirror of
https://github.com/golang/go
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fb273fc3a3
Passes toolstash -cmp. Fixes #16870. Change-Id: I70dc3bbb3cd3031826e5a54b96ba1ea603c282d1 Reviewed-on: https://go-review.googlesource.com/27910 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
141 lines
1.7 KiB
Go
141 lines
1.7 KiB
Go
// run
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// Copyright 2016 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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package main
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import (
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"log"
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"reflect"
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)
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func test(got, want interface{}) {
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if !reflect.DeepEqual(got, want) {
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log.Fatalf("got %v, want %v", got, want)
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}
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}
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func main() {
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var i int
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var ip *int
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var ok interface{}
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// Channel receives.
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c := make(chan int, 1)
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c2 := make(chan int)
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c <- 42
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i, ok = <-c
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test(i, 42)
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test(ok, true)
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c <- 42
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_, ok = <-c
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test(ok, true)
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c <- 42
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select {
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case i, ok = <-c:
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test(i, 42)
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test(ok, true)
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}
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c <- 42
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select {
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case _, ok = <-c:
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test(ok, true)
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}
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c <- 42
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select {
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case i, ok = <-c:
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test(i, 42)
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test(ok, true)
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default:
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log.Fatal("bad select")
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}
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c <- 42
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select {
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case _, ok = <-c:
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test(ok, true)
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default:
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log.Fatal("bad select")
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}
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c <- 42
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select {
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case i, ok = <-c:
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test(i, 42)
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test(ok, true)
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case <-c2:
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log.Fatal("bad select")
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}
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c <- 42
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select {
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case _, ok = <-c:
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test(ok, true)
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case <-c2:
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log.Fatal("bad select")
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}
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close(c)
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i, ok = <-c
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test(i, 0)
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test(ok, false)
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_, ok = <-c
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test(ok, false)
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// Map indexing.
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m := make(map[int]int)
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i, ok = m[0]
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test(i, 0)
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test(ok, false)
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_, ok = m[0]
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test(ok, false)
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m[0] = 42
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i, ok = m[0]
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test(i, 42)
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test(ok, true)
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_, ok = m[0]
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test(ok, true)
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// Type assertions.
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var u interface{}
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i, ok = u.(int)
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test(i, 0)
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test(ok, false)
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ip, ok = u.(*int)
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test(ip, (*int)(nil))
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test(ok, false)
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_, ok = u.(int)
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test(ok, false)
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u = 42
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i, ok = u.(int)
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test(i, 42)
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test(ok, true)
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_, ok = u.(int)
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test(ok, true)
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u = &i
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ip, ok = u.(*int)
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test(ip, &i)
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test(ok, true)
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_, ok = u.(*int)
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test(ok, true)
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}
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