syntax_data: {"ast_node_type":"impl","tokens":[{"end":70,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // If this is trait/impl method, extract the trait's args.
context_before:         if let DefKind::Fn | DefKind::AssocFn = tcx.def_kind(def_id) {
context_after:             let trait_args = match tcx.trait_of_assoc(def_id.to_def_id()) {