And to see if a character is punctuation, use the handy isPunctuation function https://hackage.haskell.org/package/base-4.8.2.0/docs/Data-Char.html#v:isPun... On Wed, Apr 13, 2016 at 4:50 PM, Tim Perry wrote:

I think it has something to do with which unicode symbols are punctuation.

Check out this StackOverflow answer:

http://stackoverflow.com/questions/10548170/what-characters-are-permitted-fo...

On Wed, Apr 13, 2016 at 12:33 PM, Silent Leaf wrote:

...

Hi!

say I wanna use "—" as new infix operator: it's the big dash used a bit like parenthesis, especially at the end of sentences —like this.

in ghci directly: Prelude> let (—) a b = a + b

No problem, is accepted and usable. Same in files.

Now I try using (»), a French (amongst others) punctuation sign, typically replaces the quote-ends, « like this ». Doesn't work: <interactive>:2:6: lexical error at character '\187'

I thought Haskell was Unicode-friendly? Why some symbols but not others? :'( _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners

I'm sorry to hear that. I guess the answer is more complicated than I thought. If I were you I'd post the question on Stack Overflow, there are quite a few experienced Haskell programmers on there that have always sorted my issues out quickly and thoroughly. If you do post on Stack Overflow, please post the link here. Good luck and sorry my info wasn't helpful. Tim On Wed, Apr 13, 2016 at 6:30 PM, Silent Leaf wrote:

Well the problem is, the function you point out returns "true" for both symbols. And yet, one of them is refused as part of an operator, or anywhere for that matter, except between quotes of course. The function isn't true, both symbols are officially Unicode punctuation. That's really weird, and a bit sad, it could have been really useful to me :/ _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners