use crate::hkt::HKT;
pub trait Chain<A, B>: HKT<A, B> {
fn chain<F>(self, f: F) -> <Self as HKT<A, B>>::Target
where
F: FnOnce(A) -> <Self as HKT<A, B>>::Target;
}
impl<A, B> Chain<A, B> for Option<A> {
fn chain<F>(self, f: F) -> Self::Target
where
F: FnOnce(A) -> <Self as HKT<A, B>>::Target,
{
self.and_then(f)
}
}