| // 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 |
| |
| import ( |
| "fmt" |
| ) |
| |
| type FooType[T any] interface { |
| Foo(BarType[T])string |
| } |
| type BarType[T any] interface { |
| Bar(FooType[T])string |
| } |
| |
| type Baz[T any] T |
| func (l Baz[T]) Foo(v BarType[T]) string { |
| return v.Bar(l) |
| } |
| type Bob[T any] T |
| func (l Bob[T]) Bar(v FooType[T]) string { |
| if v,ok := v.(Baz[T]);ok{ |
| return fmt.Sprintf("%v%v",v,l) |
| } |
| return "" |
| } |
| |
| |
| func main() { |
| var baz Baz[int] = 123 |
| var bob Bob[int] = 456 |
| |
| if got, want := baz.Foo(bob), "123456"; got != want { |
| panic(fmt.Sprintf("got %s want %s", got, want)) |
| } |
| } |
