[GHC] #12679: Permit abstract data types in signatures that don't have kind *

[GHC]

#12679: Permit abstract data types in signatures that don't have kind *
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        Reporter:  ezyang            |                Owner:
            Type:  feature request   |               Status:  patch
        Priority:  low               |            Milestone:
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      Resolution:                    |             Keywords:  backpack
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2595
       Wiki Page:                    |
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Comment (by Edward Z. Yang <ezyang@…>):

 In [changeset:"7e77c4b2ee08d7f88df8ba47537640ec1bd70bfe/ghc"
 7e77c4b2/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="7e77c4b2ee08d7f88df8ba47537640ec1bd70bfe"
 Support constraint synonym implementations of abstract classes.

 Summary:

 Test Plan: validate

 Reviewers: goldfire, simonpj, austin, bgamari

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2595

 GHC Trac Issues: #12679
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12679#comment:7>
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