syntax_data: {"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let trait_args = match tcx.trait_of_assoc(def_id.to_def_id()) {
context_before:             // If this is trait/impl method, extract the trait's args.
context_after:                 Some(trait_def_id) => {