Function radn::func::derivations::fmap

pub fn fmap<'a, T: Functor<'a>, A: 'a + Send, B: 'a + Send>(
    f: impl 'a + Send + FnOnce(A) -> B
) -> impl FnOnce(Wrap<'a, A, T>) -> Wrap<'a, B, T>

Equivalent of Haskell’s fmap. function-function equivalent of Functor::fmap.