| // 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)) | |
| } | |
| } |