| // run -gcflags=-G=3 | |
| // 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]() | |
| } |