[GHC] #13668: Space leak re-introduced

[GHC]

#13668: Space leak re-introduced
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        Reporter:  simonpj           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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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Comment (by bgamari):

 If we `seqExpr` the tidied template expression we win back most, but not
 all, of the benefit. It still leaves a few percent reduction in
 `max_bytes_used` on the table relative to `seqUnfolding` the new
 unfolding, however.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13668#comment:2>
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