Macro function_compose::c1

macro_rules! c1 {
    ($fLeft:ident, $current_f:ident, true, true) => { ... };
    ($fLeft:ident, $current_f:ident, true, false) => { ... };
    ($fLeft:ident, $current_f:ident, false, false) => { ... };
    ($fLeft:ident, $current_f:ident, false, true) => { ... };
}