[GHC] #16199: GHC 8.6 bundles libraries that don't correspond to Hackage releases

[GHC]

#16199: GHC 8.6 bundles libraries that don't correspond to Hackage releases
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:
       Component:  libraries         |              Version:  8.6.3
  (other)                            |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14678            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 We should be careful about `transformers`, since there are actually API-
 relevant code changes that were introduced in commit
 https://gitlab.haskell.org/ghc/packages/transformers/commit/80557845cdc0e72bc05cec19cf7a1bf5495e9e69.
 In particular, I'm pretty sure that `contravariant-1.5` requires these
 changes to compile (at least, angerman reported an error when he tried to
 build `contravariant-1.5` with the Hackage version of
 `transformers-0.5.5.0`).

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16199#comment:4>
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