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

[GHC]

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

Comment (by hvr):

 Replying to [comment:10 Ben Gamari <ben@…>]:
 > parser: Allow Lm (MODIFIER LETTER) category in identifiers
 >
 > Easy fix in the parser to stop regressions, due to Unicode 7.0 changing
 > the classification of some prior code points.

 nitpick: the way the commit message is worded (as well the comments in
 this ticket) suggests that e.g. `xᵦx` is now a valid identifier... which
 it isn't...

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10196#comment:12>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler