[GHC] #12706: Collecting type info is slow

[GHC]

#12706: Collecting type info is slow
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        Reporter:  vshabanov         |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              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 vshabanov):

 Latest haskell-mode for Emacs uses ":set +c" by default. So it's not that
 rarely used.

 I will try to build a profiled compiler and look whether there is
 something obvious.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12706#comment:2>
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