[GHC] #11018: ApiAnnotations: Add SourceText for unicode tokens

[GHC]

#11018: ApiAnnotations: Add SourceText for unicode tokens
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        Reporter:  alanz             |                Owner:  alanz
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
                                     |  ApiAnnotations
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by mpickering):

 No. Go for it.

 For the purpose of this ticket, I will also add that I think adding a flag
 `IsUnicodeSyntax` is better than adding `SourceText`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11018#comment:2>
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