mirror of
https://github.com/golang/go
synced 2024-11-08 19:06:26 -07:00
31 lines
476 B
Go
31 lines
476 B
Go
|
// run
|
||
|
|
|
||
|
|
// Copyright 2022 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.
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
type SomeInterface interface {
|
||
|
|
Whatever()
|
||
|
|
}
|
||
|
|
|
||
|
|
func X[T any]() T {
|
||
|
|
var m T
|
||
|
|
|
||
|
|
// for this example, this block should never run
|
||
|
|
if _, ok := any(m).(SomeInterface); ok {
|
||
|
|
var dst SomeInterface
|
||
|
|
_, _ = dst.(T)
|
||
|
|
return dst.(T)
|
||
|
|
}
|
||
|
|
|
||
|
|
return m
|
||
|
|
}
|
||
|
|
|
||
|
|
type holder struct{}
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
X[holder]()
|
||
|
|
}
|