[GHC] #11144: Custom type errors need tidying

[GHC]

#11144: Custom type errors need tidying
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1547
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by goldfire):

 `checkValidType` also sometimes see GHC-generated kinds. I've threaded a
 `TidyEnv` all throughout !TcValidity on my branch. So no need for you to
 do this.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11144#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler