[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:  7.10.2
       Component:  Compiler          |              Version:  7.10.1
  (Parser)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #5108             |  Differential Rev(s):  Phab:D969
       Wiki Page:                    |
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Changes (by nomeata):

 * status:  closed => new
 * resolution:  fixed =>


Comment:

 Sorry, to bring this up late, but the report specifies “Haskell compilers
 are expected to make use of new versions of Unicode as they are made
 available.” So if we deviate from that, we should make sure that
  * the user’s guide explicitly lists all deviations from the report [in
 this
 section](https://downloads.haskell.org/~ghc/latest/docs/html/users_guide
 /bugs-and-infelicities.html#infelicities-lexical), and
  * that the Haskell prime committee is going to be aware of these
 (sensible) deviations, so that they can become official.

 This is also important for, e.g. #11012.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10196#comment:17>
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