{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"SubregionOrigin::RelateObjectBound(a)"}]}
            SubregionOrigin::RelateObjectBound(a) => a,
            SubregionOrigin::Subtype(ref a) => a.span(),
            SubregionOrigin::RelateParamBound(a, ..) => a,