[GHC] #9314: Huge space leak of GHC API 7.8.x

[GHC]

#9314: Huge space leak of GHC API 7.8.x
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        Reporter:  kazu-yamamoto     |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  GHC API           |          Version:  7.8.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  Other             |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by JohnWiegley):

 I'm seeing a problem too, with an application that builds fine using
 7.6.3.  When building with -O2 and 7.8.3, GHC exhausts system memory (16G)
 and ultimately is killed.  With 7.8.3 and -O1, or with 7.6.3, it finishes.

 I can't paste my code here, but would be happy to try any suggestions to
 help isolate the problem.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9314#comment:3>
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