[GHC] #14135: PatternSynonyms regression in GHC HEAD (expectJust mkOneConFull)

[GHC]

#14135: PatternSynonyms regression in GHC HEAD (expectJust mkOneConFull)
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        Reporter:  RyanGlScott       |                Owner:  dfeuer
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:
                                     |  PatternSynonyms
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3981
       Wiki Page:                    |
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Comment (by dfeuer):

 Something really weird is going on. I tried building GHC with profiling to
 trace down the problem, but that made it go away. If GHC is encountering a
 correctness problems ''compiling itself'', then we have serious trouble on
 our hands.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14135#comment:16>
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