[GHC] #10558: Alter type of parseDeclaration and parseTypeSignature entry points

[GHC]

#10558: Alter type of parseDeclaration and parseTypeSignature entry points
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        Reporter:  mpickering        |                   Owner:
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:
                                     |  D1007
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Comment (by simonpj):

 Simplifying the type and adding documentation: both good with me!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10558#comment:3>
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