| // run | |
| // 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 | |
| import ( | |
| "reflect" | |
| ) | |
| type A[T any] struct { | |
| B[int] | |
| } | |
| type B[T any] struct { | |
| } | |
| func (b B[T]) Bat() { | |
| t := new(T) | |
| if tt := reflect.TypeOf(t); tt.Kind() != reflect.Pointer || tt.Elem().Kind() != reflect.Int { | |
| panic("unexpected type, want: *int, got: "+tt.String()) | |
| } | |
| } | |
| type Foo struct { | |
| A[string] | |
| } | |
| func main() { | |
| Foo{}.A.Bat() | |
| Foo{}.A.B.Bat() | |
| Foo{}.Bat() | |
| } |