pub unsafe extern "C" fn btck_block_to_bytes(
block: *const btck_Block,
writer: btck_WriteBytes,
user_data: *mut c_void,
) -> c_intpub unsafe extern "C" fn btck_block_to_bytes(
block: *const btck_Block,
writer: btck_WriteBytes,
user_data: *mut c_void,
) -> c_int