[Haskell-cafe] A really bad way to say "all isSpace"

Hi, Reading through the code to read: read s = case [x | (x,t) <- reads s, ("","") <- lex t] of [x] -> x [] -> error "Prelude.read: no parse" _ -> error "Prelude.read: ambiguous parse" Reading through the code to lex, it appear that it will return [("","")] if and only if all isSpace t. If this is really the case, does it make sense to state all isSpace t? It has a much clearer meaning to me. Thanks Neil