Macro hyper_static_server::builder_call_asset

macro_rules! builder_call_asset {
    ( $_builder : ident, { $_source : literal }, $_route : tt ) => { ... };
    ( $_builder : ident, { $_source : literal, content_type : $_content_type : ident }, $_route : tt ) => { ... };
    ( $_builder : ident, $_source : literal ) => { ... };
    ( $_builder : ident, $_source : literal, $_route : tt ) => { ... };
}