[GHC] #12150: Compile time performance degradation on code that uses undefined/error with CallStacks

[GHC]

#12150: Compile time performance degradation on code that uses undefined/error with
CallStacks
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        Reporter:  thomie            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10844            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by gridaphobe):

 Thomie, could you share the program from which you derived your example?

 Does it also use `undefined` or was it using CallStacks in some other
 manner? And if it was using `undefined`, do you see a similar slowdown if
 you replace `undefined` with the old (callstack-less) `error`?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12150#comment:8>
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