[GHC] #14887: Explicitly quantifying a kind variable causes a telescope to fail to kind-check

[GHC]

#14887: Explicitly quantifying a kind variable causes a telescope to fail to kind-
check
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        Reporter:  RyanGlScott       |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler (Type    |              Version:  8.2.2
  checker)                           |
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Richard's
 [https://phabricator.haskell.org/rGHCfaec8d358985e5d0bf363bd96f23fe76c9e281f7
 #change-V13ptOp5f1gq patch] says

 "The error message for dependent/should_fail/TypeSkolEscape has become
 noticeably worse. However, this is because the code in TcErrors goes to
 some length to preserve pre-8.0 error messages for kind errors. It's time
 to rip off that plaster and get rid of much of the kind-error-specific
 error messages. I tried this, and doing so led to a lovely error message
 for TypeSkolEscape. So: I'm accepting the error message quality regression
 for now, but will open up a new ticket to fix it, along with a larger
 error-message improvement I've been pondering. This applies also to
 dependent/should_fail/{BadTelescope2,T14066,T14066e}, polykinds/T11142."

 We think this is related.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14887#comment:11>
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