pub unsafe extern "C" fn grpcwrap_channel_create_call(
    channel: *mut grpc_channel,
    parent_call: *mut grpc_call,
    propagation_mask: u32,
    cq: *mut grpc_completion_queue,
    method: *const c_char,
    method_len: usize,
    host: *const c_char,
    host_len: usize,
    deadline: gpr_timespec
) -> *mut grpc_call