-- | /O(1)/. The minimal key of the map.
findMin :: IntMap a -> (Key, a)
findMin (IntMap (WordMap Empty)) = error "findMin: empty map has no minimal element"
findMin :: IntMap a -> (Key, a)
findMin (IntMap (WordMap Empty)) = error "findMin: empty map has no minimal element"
findMin (IntMap (WordMap Empty)) = error "findMin: empty map has no minimal element"