mirror of
https://github.com/golang/go
synced 2024-11-22 09:04:42 -07:00
f316a7ea87
Fixes #5691. R=golang-dev, bradfitz, daniel.morsing, rsc CC=golang-dev https://golang.org/cl/10255047
54 lines
666 B
Go
54 lines
666 B
Go
// run
|
|
|
|
// Copyright 2009 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 interface conversion fails when method is missing.
|
|
|
|
package main
|
|
|
|
type I interface {
|
|
Foo()
|
|
}
|
|
|
|
func main() {
|
|
shouldPanic(p1)
|
|
shouldPanic(p2)
|
|
}
|
|
|
|
func p1() {
|
|
var s *S
|
|
var i I
|
|
var e interface{}
|
|
e = s
|
|
i = e.(I)
|
|
_ = i
|
|
}
|
|
|
|
type S struct{}
|
|
|
|
func (s *S) _() {}
|
|
|
|
type B interface {
|
|
_()
|
|
}
|
|
|
|
func p2() {
|
|
var s *S
|
|
var b B
|
|
var e interface{}
|
|
e = s
|
|
b = e.(B)
|
|
_ = b
|
|
}
|
|
|
|
func shouldPanic(f func()) {
|
|
defer func() {
|
|
if recover() == nil {
|
|
panic("function should panic")
|
|
}
|
|
}()
|
|
f()
|
|
}
|