[GHC] #9971: GHC 7.10 dies with "out of memory"

[GHC]

#9971: GHC 7.10 dies with "out of memory"
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        Reporter:  albertov          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1-rc1
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by albertov):

 Replying to [comment:2 nomeata]:
 > You added `UndecidableInstances` there. This means: „My typeclass
 instances may not be terminating, so when GHC runs into an infinite loop
 here, it’s my fault.“ I did not yet check whether this is the problem, but
 in a way, you voided the warranty here. Can you reproduce the problem
 without `UndecidableInstances`?

 The problem occurs without `UndecidableInstances` too since `Types.hs` is
 not using it at all. I've used `UndecidableInstances` on another module
 (`Arbitrary.hs`) but it doesn't get a chance to get compiled since it
 depends on `Types.hs` which is the problematic module.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9971#comment:3>
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