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// run
// Copyright 2016 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.
// Test that an interface conversion error panics with an "interface
// conversion" run-time error. It was (incorrectly) panicing with a
// "nil pointer dereference."
package main
import (
"fmt"
"runtime"
"strings"
)
type I interface {
Get() int
}
func main() {
defer func() {
r := recover()
if r == nil {
panic("expected panic")
}
re, ok := r.(runtime.Error)
if !ok {
panic(fmt.Sprintf("got %T, expected runtime.Error", r))
}
if !strings.Contains(re.Error(), "interface conversion") {
panic(fmt.Sprintf("got %q, expected interface conversion error", re.Error()))
}
}()
e := (interface{})(0)
if _, ok := e.(I); ok {
panic("unexpected interface conversion success")
}
fmt.Println(e.(I))
panic("unexpected interface conversion success")
}
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