[GHC] #11053: Add a warning for pattern synonyms without signatures

[GHC]

#11053: Add a warning for pattern synonyms without signatures
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           Reporter:  mpickering     |             Owner:
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.2
           Keywords:  newcomer       |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 It is accepted as good style that top-level definitions should have type
 signatures. Pattern synonyms seem no different to me in this regard so I
 think it would be good if GHC warned if there was a pattern synonym
 definition which lacked a type signature.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11053>
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