[GHC] #11602: Exponential behaviour in typeKind, unifyTys etc

[GHC]

#11602: Exponential behaviour in typeKind, unifyTys etc
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        Reporter:  simonpj           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by niteria):

 This is a profile that I got recently on T5030:
 [https://phabricator.haskell.org/P101 P101].

 `promoteCoercionU1` is the `SCC` I added
 [https://phabricator.haskell.org/diffusion/GHC/browse/master/compiler/types/Unify.hs;4c6e95e4f92516a925fd2a1bce0c0f8b5b9cbd17$1073
 here]

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11602#comment:2>
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