| // 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 | |
| type Constraint[T any] interface { | |
| ~func() T | |
| } | |
| func Foo[T Constraint[T]]() T { | |
| var t T | |
| t = func() T { | |
| return t | |
| } | |
| return t | |
| } | |
| func main() { | |
| type Bar func() Bar | |
| Foo[Bar]() | |
| } |