[GHC] #12734: Unexpected context reduction stack overflow

[GHC]

#12734: Unexpected context reduction stack overflow
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        Reporter:  danilo2           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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 danilo2):

 That's strange – maybe we're using some strange pattern, but our team is
 getting this error very often recently and we're using hacks to make it
 working just by expanding variables to full types. In this case I'll raise
 the priority of this bug. If anyone don't agree, feel free to lower it –
 it just slows down our workflow much.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12734#comment:6>
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