[GHC] #10260: last uses too much space with optimizations disabled

[GHC]

#10260: last uses too much space with optimizations disabled
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        Reporter:  rwbarton          |                   Owner:  nomeata
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:
       Component:  Core Libraries    |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D847
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Comment (by nomeata):

 >  Maybe. But eta expansion is in general a tremendously good thing. I'd
 love just to try it.

 Looks like I forgot to cross-reference the ticket where I started working
 on this: #10319

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10260#comment:16>
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