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

Neil Mitchell wrote:

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.

I think 'lex' is supposed to not understand (haskell-style) comments - which I agree with - so I agree that it would be "better" to say (all isSpace t). I might even have thought that in passing when reading that code, I don't remember.... Isaac