[GHC] #12754: Adding an explicit export list halves compilation time.

[GHC]

#12754: Adding an explicit export list halves compilation time.
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        Reporter:  mpickering        |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  invalid           |             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 niteria):

 I get a difference here, but not as dramatic:

 {{{
 real    0m11.544s
 user    0m11.210s
 sys     0m0.243s
 }}}

 vs

 {{{
 real    0m14.845s
 user    0m14.279s
 sys     0m0.291s
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12754#comment:2>
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