[GHC] #11224: Program doesn't preserve semantics after pattern synonym inlining.

[GHC]

#11224: Program doesn't preserve semantics after pattern synonym inlining.
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        Reporter:  anton.dubovik     |                Owner:
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:  x86_64
 Type of failure:  Incorrect result  |  (amd64)
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11225            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by goldfire):

 * priority:  normal => highest


Comment:

 Bumping priority as whatever our decision is, we should make it and
 implement it soon, as it will likely not be fully backward compatible, and
 I don't want this sand shifting between 7.10 and 8.0 and then again
 between 8.0 and 8.2.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11224#comment:9>
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