[GHC] #15579: topNormaliseType is wrong

[GHC]

#15579: topNormaliseType is wrong
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        Reporter:  simonpj           |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      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 RyanGlScott):

 What is the status of this ticket now that
 [https://gitlab.haskell.org/ghc/ghc/commit/2b90356d26b4699227816ad9424e766eccdb6c36
 2b90356d26b4699227816ad9424e766eccdb6c36] (Fix #14729 by making the
 normaliser homogeneous) has landed?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15579#comment:4>
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