[GHC] #14683: Slow compile times for Happy-generated source

[GHC]

#14683: Slow compile times for Happy-generated source
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        Reporter:  harpocrates       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
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 tdammers):

 #1 has been addressed fairly thoroughly in #11735, bringing execution time
 down from ~250 s to ~12 s. Closing this for now, especially considering
 how #11598 doesn't seem very promising and how we have implemented some
 role caching in more specific spots as part of #11735.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14683#comment:18>
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