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pub trait MyTrait2<X> {
type Output;
}
pub trait MyTrait {
type Item;
fn next(&mut self) -> Option<Self::Item>;
fn fold<B, F>(self, init: B, f: F) -> B where
Self: Sized,
F: MyTrait2<(B, Self::Item), Output=B>;
}
pub struct Cloned<I>(I);
impl<'a, T, I> MyTrait for Cloned<I> where
T: 'a + Clone,
I: MyTrait<Item = &'a T>
{
type Item = T;
fn next(&mut self) -> Option<Self::Item> { loop {} }
fn fold<B, F>(self, init: B, f: F) -> B where
Self: Sized,
F: MyTrait2<(B, Self::Item), Output=B>
{
loop {}
}
}
pub trait MyFuture {
type Output;
}
pub trait MyIntoFuture {
type Output;
type Fut: MyFuture<Output=Self::Output>;
fn into_future(self) -> Self::Fut;
fn into_future_2(self, other: Self) -> Self::Fut;
}
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