[GHC] #8584: Pattern synonym type signatures

[GHC]

#8584: Pattern synonym type signatures
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       Reporter:  cactus            |             Owner:
           Type:  feature request   |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Compiler          |           Version:
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:  5144              |          Blocking:
Related Tickets:                    |
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 Currently, the only way to specify a type signature for a pattern synonym
 is by adding type annotations to the right-hand side, like this:

 {{{
 {-# LANGUAGE PatternSynonyms, ScopedTypeVariables #-}

 pattern Single x = ([x] :: [Int])
 }}}

 Bespoke syntax for adding type signatures for pattern synonyms would
 probably be useful.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8584>
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