[GHC] #14923: Recompilation avoidance fails after a LANGUAGE change

[GHC]

#14923: Recompilation avoidance fails after a LANGUAGE change
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        Reporter:  akio              |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.4.1
      Resolution:                    |             Keywords:
Operating System:  Linux             |         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):

 Hmm, very interesting. It looks to me like `fingerprintDynFlags` includes
 the language flags in its hash.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14923#comment:1>
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