{"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"MultipleSupertraitUpcastable:"}]}
            MultipleSupertraitUpcastable: MultipleSupertraitUpcastable,
            OpaqueHiddenInferredBound: OpaqueHiddenInferredBound,
            MapUnitFn: MapUnitFn,