#[unsafe(no_mangle)]pub extern "C" fn nstd_mutex_get_mut(
guard: &mut NSTDMutexGuard<'_, '_>,
) -> NSTDAnyMutAvailable on crate feature
mutex only.#[unsafe(no_mangle)]pub extern "C" fn nstd_mutex_get_mut(
guard: &mut NSTDMutexGuard<'_, '_>,
) -> NSTDAnyMutmutex only.