[GHC] #12045: Visible kind application

[GHC]

#12045: Visible kind application
-------------------------------------+-------------------------------------
        Reporter:  Iceland_jack      |                Owner:  mnguyen
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
                                     |  TypeApplications TypeInType
                                     |  GHCProposal
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:  14579
 Related Tickets:  #15782            |  Differential Rev(s):  Phab:D5229
       Wiki Page:                    |
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Comment (by Richard Eisenberg <rae@…>):

 In [changeset:"74ed9c1c1b26971133c7166663b9c966d2eaca08/ghc"
 74ed9c1c/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="74ed9c1c1b26971133c7166663b9c966d2eaca08"
 Actually fail in failIfEmitsConstraints

 The function TcHsType.failIfEmitsConstraints says that it fails.
 It even does so in its name. But it didn't! It *reported* constraints
 but didn't fail. Now it does.

 This is important in tcHsClsInstType; see the comments therein.

 This was discovered while looking at #15797, but that ticket
 requires visible kind application to exhibit the bug; the test
 case will come with the patch for #12045.
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12045#comment:21>
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