What is the difference between empty list [] and list with one unit element [()]?
Or, yet: ():[()] --is legal 10:[()] --is not One list can contain elements of a single type. Since the type of () is () (element constructors and types are allowed to have the same name), a list of type [()] can only contain elements of type (), i.e., ()s. Try this is ghci: :t [()] :t [(),(),(),()] Best, Maurício _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
