[GHC] #14220: GeneralizedNewtypeDeriving and polymorphic arguments don't play nicely together

[GHC]

#14220: GeneralizedNewtypeDeriving and polymorphic arguments don't play nicely
together
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        Reporter:  ivanm         |                Owner:  (none)
            Type:  bug           |               Status:  new
        Priority:  normal        |            Milestone:
       Component:  Compiler      |              Version:  8.0.2
      Resolution:                |             Keywords:
Operating System:  MacOS X       |         Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:  #12104        |  Differential Rev(s):
       Wiki Page:                |
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Changes (by RyanGlScott):

 * related:   => #12104


Comment:

 Thanks for the bug report. Note that this only happens when `-fdefer-type-
 errors` is on. This is a duplicate of #12104, which has been fixed in GHC
 8.2.1.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14220#comment:2>
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