[GHC] #10196: Regression regarding Unicode subscript characters in identifiers

[GHC]

#10196: Regression regarding Unicode subscript characters in identifiers
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        Reporter:  thomie            |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.10.3
       Component:  Compiler          |                 Version:  7.10.1
  (Parser)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  GHC rejects       |               Test Case:
  valid program                      |                Blocking:
      Blocked By:                    |  Differential Revisions:  Phab:D969
 Related Tickets:  #5108             |
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Comment (by hvr):

 I'm reopening this temporarily, because GHC 7.8.4 does in fact accept e.g.

 {{{
 λ:6> let xᵦx = ()
 xᵦx :: ()
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10196#comment:14>
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