{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"ty::Adt(adt_def,"}]}
                ty::Adt(adt_def, args) if adt_def.is_enum() => {
            match *self_ty.kind() {
                    adt_def.variant(variant_index).fields[f].ty(tcx, args)