applyLeft5<R, T0, T1, T2, T3, T4> function
Implementation
Fn4<R, T1, T2, T3, T4> applyLeft5<R, T0, T1, T2, T3, T4>(
Fn5<R, T0, T1, T2, T3, T4> fn, T0 arg) =>
(a1, a2, a3, a4) => fn(arg, a1, a2, a3, a4);