[GHC] #11405: Incorrect failure of type-level skolem escape check

[GHC]

#11405: Incorrect failure of type-level skolem escape check
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  8.0.1-rc1
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Richard Eisenberg <eir@…>):

 In [changeset:"bafbde7e239dd7353fb32cb2ff1b1c9139e4f45c/ghc"
 bafbde7e/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="bafbde7e239dd7353fb32cb2ff1b1c9139e4f45c"
 Constrained types have kind * in validity check.

 This addresses #11405, but a deeper problem lurks.
 Try test dependent/should_compile/T11405 and see comment:3
 on the ticket.
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11405#comment:9>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler