| // 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 a | |
| type X int | |
| func (x X) M() X { return x } | |
| func F[T interface{ M() U }, U interface{ M() T }]() {} | |
| func G() { F[X, X]() } |