[GHC] #14936: GHC 8.4 performance regressions when using newtypes

[GHC]

#14936: GHC 8.4 performance regressions when using newtypes
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        Reporter:  danilo2           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.4.2
       Component:  Compiler          |              Version:  8.4.1
      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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Changes (by RyanGlScott):

 * cc: simonpj (added)
 * milestone:   => 8.4.2


Comment:

 This regression was introduced in commit
 fb050a330ad202c1eb43038dc18cca2a5be26f4a (`Do not bind coercion variables
 in SpecConstr rules`).

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14936#comment:4>
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