[GHC] #5108: Allow unicode sub/superscript symbols in both identifiers and operators

[GHC]

#5108: Allow unicode sub/superscript symbols in both identifiers and operators
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              Reporter:              |            Owner:
  mikhail.vorozhtsov                 |           Status:  infoneeded
                  Type:  feature     |        Milestone:  7.10.1
  request                            |          Version:  7.1
              Priority:  normal      |         Keywords:  lexer unicode
             Component:  Compiler    |     Architecture:  Unknown/Multiple
  (Parser)                           |       Difficulty:  Unknown
            Resolution:              |       Blocked By:
      Operating System:              |  Related Tickets:
  Unknown/Multiple                   |
       Type of failure:              |
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by zardoz):

 I also stumbled into this when trying to use the modifier letter prime
 (U+02B9) and related modifiers. Supporting them in identifiers would be
 awesome. As for operators I don’t feel strongly either way. I was just
 confused about modifiers not working in identifiers, because they are
 classified as alphanumeric in the Unicode properties.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5108#comment:14>
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