toAccept :: Ord a => [a] -> (a -> Bool) let xset = Set.fromList xs in -(a ~ Set.Set (Set.Set a)) bound by the type signature for
toAccepttoAccept :: Ord a => [a] -> a -&g
根据我对Python 2.7.2文档的解释Built-In Types 5.7 Set Types,应该可以通过将A传递给集合B来从集合B中删除集合A的元素set.remove(elem)或者set.discardType "help", "copyright", "credits" or "license">>> b = set(range(