Function git_repository::threading::downgrade_mut_to_ref

pub fn downgrade_mut_to_ref<T, 'a>(
    v: RwLockWriteGuard<'a, RawRwLock, T>,
    _orig: &'a RwLock<RawRwLock, T>
) -> RwLockReadGuard<'a, RawRwLock, T>

Downgrade a handle previously obtained with get_mut() to drop mutation support.