{"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
                let trait_def_id = tcx.local_parent(assoc_item_def_id);
                // Also collect `where Self::Assoc: Trait` from the parent trait's where clauses.
                let trait_predicates = tcx.trait_explicit_predicates_and_bounds(trait_def_id);