Macro builder_call_askama

macro_rules! builder_call_askama {
    ( $_builder : ident, { $_source : literal $( , context : $_context_type : ty $( , context_from : $_context_path : literal )? )? }, $_route : tt ) => { ... };
    ( $_builder : ident, $_source : literal ) => { ... };
    ( $_builder : ident, $_source : literal, $_route : tt ) => { ... };
}