| // 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() |
| } |
