969 pub enum grpc_call_error {  enum
1901     ) -> grpc_call_error;  in grpc_call_start_batch()  argument
1984     ) -> grpc_call_error;  in grpc_call_cancel()  argument
2001     ) -> grpc_call_error;  in grpc_call_cancel_with_status()  argument
2030     ) -> grpc_call_error;  in grpc_server_request_call()  argument
2071     ) -> grpc_call_error;  in grpc_server_request_registered_call()  argument
2186     pub fn grpc_call_error_to_string(error: grpc_call_error) -> *const ::std::os::raw::c_char;  in grpc_call_error_to_string()
3054     ) -> grpc_call_error;  in grpc_call_set_credentials()  argument
3921     ) -> grpc_call_error;  in grpcwrap_call_start_unary()  argument
3930     ) -> grpc_call_error;  in grpcwrap_call_start_client_streaming()  argument
3941     ) -> grpc_call_error;  in grpcwrap_call_start_server_streaming()  argument
3950     ) -> grpc_call_error;  in grpcwrap_call_start_duplex_streaming()  argument
3957     ) -> grpc_call_error;  in grpcwrap_call_recv_initial_metadata()  argument
3967     ) -> grpc_call_error;  in grpcwrap_call_send_message()  argument
3973     ) -> grpc_call_error;  in grpcwrap_call_send_close_from_client()  argument
3987     ) -> grpc_call_error;  in grpcwrap_call_send_status_from_server()  argument
3994     ) -> grpc_call_error;  in grpcwrap_call_recv_message()  argument
4001     ) -> grpc_call_error;  in grpcwrap_call_start_serverside()  argument
4009     ) -> grpc_call_error;  in grpcwrap_call_send_initial_metadata()  argument
4019     ) -> grpc_call_error;  in grpcwrap_call_kick_completion_queue()  argument
4027     ) -> grpc_call_error;  in grpcwrap_server_request_call()  argument