#[unsafe(no_mangle)]pub extern "C" fn nstd_io_stdout_flush(
handle: &mut NSTDStdout,
) -> NSTDIOErrorAvailable on crate feature
io only.#[unsafe(no_mangle)]pub extern "C" fn nstd_io_stdout_flush(
handle: &mut NSTDStdout,
) -> NSTDIOErrorio only.