[Haskell-cafe] Unicode silliness

David Turner dct25-561bs at mythic-beasts.com
Thu Jul 13 10:29:53 UTC 2017


One of my colleagues asked about using Unicode symbols in Haskell operators
and I initially thought that this was supported.

However, the code at the bottom of this message doesn't parse, reporting a
lexical error on basically all of the funny characters of the form:

Main.hs:1:5: error: lexical error at character '\65288'

Character 65288 (0xff08) is punctuation [Ps] which I understand to mean it
counts as a uniSymbol in the lexical structure described in the Haskell


Should this work? Not that I really want this specific example to work, but
I'm interested to know why.

Many thanks,


$ cat app/Main.hs
foo (›’-’)› bar = False
foo ‹(’-’‹) bar = False
foo ∧(’-’)∧ bar = False
foo ∨(’-’)∨ bar = False
$ cat app/Main.hs | base64 # try and avoid mangling in email
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