Rust library to pass tasks into green coroutines and take the results.
Usage:
strcut In(&'static str);
struct Out(&'static str);
let mut resumer = spawn(|mut yielder, first_in| {
let second_in = yielder.yield_with(Out("first out"));
Out("second out")
});
resumer.resume_with(In("first in"));
resumer.resume_with(In("second in"));