[GHC] #11367: [Regression] Pattern synonyms

[GHC]

#11367: [Regression] Pattern synonyms
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        Reporter:  Iceland_jack      |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Iceland_jack):

 Small note:

 When a pattern synonym is non-exhaustive its name is mangled:
 {{{
 >>> A 3
 "*** Exception: /tmp/tmp.t0h0pMgwWb.hs:(4,1)-(5,14): Non-exhaustive
 patterns in function $bA
 }}}

 It would be preferable to emit “Non-exhaustive patterns in pattern synonym
 A”.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11367#comment:1>
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