| // run -gcflags=-G=3 | |
| // 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 main | |
| func main() { | |
| check[string]() | |
| } | |
| func check[T any]() { | |
| var result setter[T] | |
| switch result.(type) { | |
| case fooA[T]: | |
| case fooB[T]: | |
| } | |
| } | |
| type setter[T any] interface { | |
| Set(T) | |
| } | |
| type fooA[T any] struct{} | |
| func (fooA[T]) Set(T) {} | |
| type fooB[T any] struct{} | |
| func (fooB[T]) Set(T) {} |