{"ast_node_type":"variable","tokens":[{"end":80,"kind":"keyword","start":0,"text":"let"}]}
        let unique_variant = unique_ty.ty_adt_def().unwrap().non_enum_variant();
        let unique_ty = adt.non_enum_variant().fields[FieldIdx::ZERO].ty(self.tcx(), args);
        let nonnull_ty = unique_variant.fields[FieldIdx::ZERO].ty(self.tcx(), args);