[GHC] #14131: Difference between newtype and newtype instance

[GHC]

#14131: Difference between newtype and newtype instance
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        Reporter:  Iceland_jack      |                Owner:  RyanGlScott
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:  TypeFamilies
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #7938, #9574,     |  Differential Rev(s):  Phab:D3872
  #13985                             |
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * owner:  (none) => RyanGlScott


Comment:

 The refactoring suggested in comment:9 sounds good to me. But perhaps I
 should first do this refactoring in a separate commit, since doing all of
 this datatype reshuffling and fixing the bugs in #14131 and #13985
 simultaneously might be a touch too much.

 Replying to [comment:9 simonpj]:
 > We still need the typechecker test for comment:8.

 Phab:D3872 has this in the form of the
 `testsuite/tests/polykinds/T13985.hs` test.

 > Finally: we need user-manual comments to explain what's accepted and
 what is rejected.

 Phab:D3872 has this already. Done.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14131#comment:10>
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