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4c4201f0e2
Fixes #17938 Change-Id: Iad12155f4976846bd4a9a53869f89e40e5b3deb3 Reviewed-on: https://go-review.googlesource.com/34147 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
44 lines
948 B
Go
44 lines
948 B
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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// Test that an interface conversion error panics with an "interface
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// conversion" run-time error. It was (incorrectly) panicking with a
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// "nil pointer dereference."
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package main
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import (
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"fmt"
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"runtime"
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"strings"
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)
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type I interface {
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Get() int
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}
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func main() {
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defer func() {
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r := recover()
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if r == nil {
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panic("expected panic")
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}
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re, ok := r.(runtime.Error)
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if !ok {
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panic(fmt.Sprintf("got %T, expected runtime.Error", r))
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}
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if !strings.Contains(re.Error(), "interface conversion") {
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panic(fmt.Sprintf("got %q, expected interface conversion error", re.Error()))
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}
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}()
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e := (interface{})(0)
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if _, ok := e.(I); ok {
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panic("unexpected interface conversion success")
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}
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fmt.Println(e.(I))
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panic("unexpected interface conversion success")
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}
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