[GHC] #10621: Handle annotations in hsig/boot files

[GHC]

#10621: Handle annotations in hsig/boot files
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              Reporter:  spinda      |             Owner:
                  Type:  feature     |            Status:  new
  request                            |         Milestone:
              Priority:  normal      |           Version:  7.10.1
             Component:  GHC API     |  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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 Currently annotations are
 [https://github.com/ghc/ghc/blob/228ddb95ee137e7cef02dcfe2521233892dd61e0/compiler/typecheck/TcRnDriver.hs#L642
 thrown away] when typechecking hsig or hs-boot files. Can we process them
 as in normal hs source files?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10621>
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