syntax_data: {"ast_node_type":"function","tokens":[{"end":96,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn report_calling_closure(&mut self, fun: &Expr<'_>, tupled_args: Ty<'_>, expr: &Expr<'_>) {
context_after:         let underscored_args = match tupled_args.kind() {