{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"(_,"}]}
                (_, ty::Dynamic(b_region, b_data, ty::Dyn)) => result_to_single(
                // `T` -> `dyn Trait` unsizing.
                    ecx.consider_builtin_unsize_to_dyn_candidate(goal, b_region, b_data),