syntax_data: {"ast_node_type":"other","tokens":[{"end":31,"kind":"keyword","start":0,"text":"matches:"}]}
source_snippet:     matches: &getopts::Matches,
context_before:     early_dcx: &EarlyDiagCtxt,
context_after: ) -> (Vec<(String, lint::Level)>, bool, Option<lint::Level>) {