[GHC] #11276: GHC hangs/takes an exponential amount of time with simple program

[GHC]

#11276: GHC hangs/takes an exponential amount of time with simple program
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        Reporter:  mpickering        |                Owner:  gkaracha
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by simonpj):

 * owner:   => gkaracha


Comment:

 Eek.  This is another example of the new pattern-match checker falling
 into exponential behaviour.

 Workaround: `-fno-warn-overlapping-patterns -fno-warn-incomplete-patterns`

 George: here is another for your list

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11276#comment:3>
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