blob: c4e3ffd33db9fa15353b60eb65b0197574ed0391 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
// 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) panicking 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")
}
|
