| // errorcheck | |
| // Copyright 2021 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 p | |
| type T interface{ M() } | |
| func F() T | |
| var _ = F().(*X) // ERROR "undefined: X" |