cocoro 0.3.0

A more type-safe take on Rust stackless coroutines
Documentation 
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use Suspend::Return;
use Suspend::Yield;

use crate::coro::Coro;
use crate::suspend::Suspend;

/// Implemented by types that can be converted into a coroutine.
///
/// Notably, types implementing `IntoIterator` can be converted into a
/// coroutine. This coroutine takes `()` as input, yields the iterator's
/// elements, and returns `()` when the iterator is exhausted.
pub trait IntoCoro<I, Y, R> {
    type IntoCoro: Coro<I, Y, R>;
    fn into_coro(self) -> Self::IntoCoro;
}

impl<T, I: IntoIterator<Item = T>> IntoCoro<(), T, ()> for I {
    type IntoCoro = IteratorCoro<I::IntoIter>;
    fn into_coro(self) -> Self::IntoCoro {
        IteratorCoro(self.into_iter())
    }
}

pub struct IteratorCoro<I>(I);
impl<T, I: Iterator<Item = T>> Coro<(), T, ()> for IteratorCoro<I> {
    type Next = Self;
    type Suspend = Suspend<T, (), Self>;
    fn resume(mut self, _: ()) -> Self::Suspend {
        match self.0.next() {
            Some(x) => Yield(x, Self(self.0)),
            None => Return(()),
        }
    }
}