[Haskell-cafe] Re: If wishes were horses... (was: Re: definition of sum)

[Daniel Fischer]

Am Freitag 12 März 2010 12:14:06 schrieb Paul R:
> wren> I wish Haskell allowed ! to occur (non-initially) in alphanum_'
> wren> identifiers as well as in symbolic ones. Then we could be more
> wren> consistent about having ! mean strictness
>
> BTW, does something in haskell syntax prevent '?' from appearing at the
> end of identifiers ?

Yes, http://haskell.org/onlinereport/lexemes.html#sect2

uniSymbol 	 -> 	 any Unicode symbol or punctuation

Punctuation characters are symbols (as far as the lexical syntax is 
concerned), hence can't appear in varids, only in varsyms (operators).