|  | @@ -558,6 +558,9 @@ typedef struct grpc_op {
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				|  |  |        grpc_metadata_array* trailing_metadata;
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				|  |  |        grpc_status_code* status;
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				|  |  |        grpc_slice* status_details;
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				|  |  | +      /** If this is not nullptr, it will be populated with the full fidelity
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				|  |  | +       * error string for debugging purposes. The application is responsible
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				|  |  | +       * for freeing the data. */
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				|  |  |        const char** error_string;
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				|  |  |      } recv_status_on_client;
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				|  |  |      struct grpc_op_recv_close_on_server {
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