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Yeah, I'd like to see more languages using unicode identifiers. Seems to be a very unpopular approach, though :(
Haskell can do it: there's a library with common Unicode operators[1] (including ∘ for function composition) and an extension allowing you to use Unicode syntax [2] (things like → in place of ->). I've seen these things used, but they're not super common. People still worry about not being able to input Unicode symbols in their editor! I personally think this is absurd in this day and age. Naturally, it's very easy t…
Oh, nice! I setup XCompose to support rfc1345, so I have fast unicode input everywhere. I'm definitely going to experiment with that Haskell extension. I've done that manually before in ML with a preprocessor, but it was a nasty hack. A proper extension is much nicer!
EDIT: How many people still have trouble with Unicode input? Should I publish my XCompose solution?