Trait Chain
fp_core::chain
pub trait Chain<A, B>: HKT<A, B> { fn chain<F>(self, f: F) -> Self::Target where F: FnOnce(A) -> Self::Target; }
fn chain<F>(self, f: F) -> Self::Target where F: FnOnce(A) -> Self::Target,
impl<A, B> Chain<A, B> for Option<A>