Macro builder_call_route_extensions

macro_rules! builder_call_route_extensions {
    ( $_builder : expr, default ) => { ... };
    ( $_builder : expr, $_route : literal ) => { ... };
    ( $_builder : expr, { $_route : literal } ) => { ... };
    ( $_builder : expr, { $_route : tt, extensions : $_extensions : tt } ) => { ... };
}