macro_rules! call_provider {
([][$tcx:expr, $name:ident, $key:expr]) => { ... };
([(separate_provide_extern) $($rest:tt)*][$tcx:expr, $name:ident, $key:expr]) => { ... };
([$other:tt $($modifiers:tt)*][$($args:tt)*]) => { ... };
}
macro_rules! call_provider {
([][$tcx:expr, $name:ident, $key:expr]) => { ... };
([(separate_provide_extern) $($rest:tt)*][$tcx:expr, $name:ident, $key:expr]) => { ... };
([$other:tt $($modifiers:tt)*][$($args:tt)*]) => { ... };
}