Struct std::MapFut
generic<F: Future, T, U> struct MapFut {
F inner;
fn U(T) f;
}'inner''s output passed through f (FutureExt::map). Output: U.
generic<F: Future, T, U> struct MapFut {
F inner;
fn U(T) f;
}'inner''s output passed through f (FutureExt::map). Output: U.