syntax_data: {"ast_node_type":"other","tokens":[{"end":15,"kind":"keyword","start":0,"text":")*"}]}
source_snippet:     )* } ) => (
context_before:         $opt:ident : $t:ty [$dep_tracking_marker:ident $( $tmod:ident $variant:ident )?],
context_after:         top_level_tmod_enum!( {$([$dep_tracking_marker $($tmod $variant),*])|*} );