[GHC] #10276: ApiAnnotations : ITopenExpQuote needs SourceText

[GHC]

#10276: ApiAnnotations : ITopenExpQuote needs SourceText
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              Reporter:  alanz       |             Owner:  alanz
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:  7.10.2
             Component:  Compiler    |           Version:  7.10.1
  (Parser)                           |  Operating System:  Unknown/Multiple
              Keywords:              |   Type of failure:  None/Unknown
          Architecture:              |        Blocked By:
  Unknown/Multiple                   |   Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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 In the lexer, `ITopenExpQuote` can be recognised for '[e|' or '[|'.

 The token definition needs to capture the original `SourceText`, and pass
 it through to `ExpBr`, which also needs a `SrcText` field.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10276>
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