// license that can be found in the LICENSE file.

package main

type Iterator[T any] interface {
	Iterate(fn T)
}

type IteratorFunc[T any] func(fn T)

func (f IteratorFunc[T]) Iterate(fn T) {
	f(fn)
}

func Foo[R any]() {
	var _ Iterator[R] = IteratorFunc[R](nil)
}

func main() {
	Foo[int]()

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]()

// license that can be found in the LICENSE file.

package main

type Iterator[T any] interface {
	Iterate(fn func(T) bool)
}

type IteratorFunc[T any] func(fn func(T) bool)

func (f IteratorFunc[T]) Iterate(fn func(T) bool) {
	f(fn)
}

type Stream[T any] struct {
	it Iterator[T]
}

func (s Stream[T]) Iterate(fn func(T) bool) {
	if s.it == nil {
		return
	}