| // 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 Iterator[T any] interface { | |
| Iterate() | |
| } | |
| type IteratorFunc[T any] func(fn func(T) bool) | |
| func (f IteratorFunc[T]) Iterate() { | |
| } | |
| func FromIterator[T any](it Iterator[T]) { | |
| it.Iterate() | |
| } | |
| func Foo[T, R any]() { | |
| FromIterator[R](IteratorFunc[R](nil)) | |
| } | |
| func main() { | |
| Foo[int, int]() | |
| } |