{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"debug_assert!(tcx.defaultness(trait_item_id).has_value());"}]}
            debug_assert!(tcx.defaultness(trait_item_id).has_value());
            // adding future default methods to `Future`, for instance.
            Some(Instance::new_raw(trait_item_id, rcvr_args))