[GHC] #7258: Compiling DynFlags is jolly slow

[GHC]

#7258: Compiling DynFlags is jolly slow
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        Reporter:  simonpj           |                Owner:  simonpj
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.6.1
      Resolution:                    |             Keywords:  deriving-perf
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 During the call Simon hypothesized that we should keep the free variables
 lists in mind when comparing STG. I stated that I didn't think that we
 currently had a way to print closures' free variable lists. I've checked
 and this isn't quite true: the pretty-printer will print free variable
 lists when `-dppr-debug` is passed. I've broken this out into its own flag
 in Phab:D4140.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7258#comment:75>
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