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pub trait LendingIterator {
type Item<'a>
where
Self: 'a;
fn consume<F>(self, _f: F)
where
Self: Sized,
for<'a> Self::Item<'a>: FuncInput<'a, Self::Item<'a>>,
{
}
}
impl<I: LendingIterator + ?Sized> LendingIterator for &mut I {
type Item<'a> = I::Item<'a> where Self: 'a;
}
struct EmptyIter;
impl LendingIterator for EmptyIter {
type Item<'a> = &'a mut () where Self:'a;
}
pub trait FuncInput<'a, F>
where
F: Foo<Self>,
Self: Sized,
{
}
impl<'a, T, F: 'a> FuncInput<'a, F> for T where F: Foo<T> {}
trait Foo<T> {}
fn map_test() {
(&mut EmptyIter).consume(());
//~^ ERROR the trait bound `for<'a> &'a mut (): Foo<&'a mut ()>` is not satisfied
}
fn main() {}
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