Function frappe::lift::lift2

pub fn lift2<T, F, S1, S2>(f: F, s1: Signal<S1>, s2: Signal<S2>) -> Signal<T> where
    F: Fn(MaybeOwned<S1>, MaybeOwned<S2>) -> T + 'static,
    T: 'static,
    S1: 'static,
    S2: 'static, 

Lifts a function into a signal.