{"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
                    let trait_ref = TyBuilder::trait_ref(db, trait_id)
                if trait_generics[param_id.local_id()].is_trait_self() {
                        .fill_with_bound_vars(DebruijnIndex::INNERMOST, 0)