[GHC] #9911: Pattern synonyms with no signatures should yield warnings

[GHC]

#9911: Pattern synonyms with no signatures should yield warnings
-------------------------------------+-------------------------------------
       Reporter:  cactus             |                   Owner:  cactus
           Type:  feature request    |                  Status:  new
       Priority:  normal             |               Milestone:  7.10.1
      Component:  Compiler (Type     |                 Version:  7.8.3
  checker)                           |        Operating System:
       Keywords:  PatternSynonyms    |  Unknown/Multiple
   Architecture:  Unknown/Multiple   |         Type of failure:  Incorrect
     Difficulty:  Unknown            |  warning at compile-time
     Blocked By:                     |               Test Case:
Related Tickets:                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 When `-fwarn-missing-signatures` is turned on, GHC should emit warnings
 for pattern synonyms with no signatures

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9911>
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