[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:  normal            |            Milestone:
       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 bernie):

 I believe this issue is causing a massive slow down in the compilation of
 the language-python library (https://github.com/bjpop/language-python). It
 used to take a couple of minutes to compile the library, now it takes 7
 hours with ghc 8.2.1.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14683#comment:8>
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