[GHC] #11195: New pattern-match check can be non-performant

[GHC]

#11195: New pattern-match check can be non-performant
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        Reporter:  goldfire          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
                                     |  PatternMatchWarnings
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1676,
       Wiki Page:                    |  Phab:D1795
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Changes (by simonpj):

 * status:  closed => new
 * resolution:  fixed =>


Comment:

 I'm re-opening this because compilation still takes a ridiculously long
 time (minutes) and memory (6.7G allocated).  Almost all of this is in the
 pattern-match checking.  It can't be right!

 Simon

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11195#comment:12>
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