{"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
    let trait_datum_bound = rust_ir::TraitDatumBound { where_clauses };
        trait_.trait_items(db).associated_types().map(to_assoc_type_id).collect();
    let well_known = db.lang_attr(trait_.into()).and_then(well_known_trait_from_lang_item);