[GHC] #11520: GHC falls into a hole if given incorrect kind signature

[GHC]

#11520: GHC falls into a hole if given incorrect kind signature
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        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler (Type    |              Version:  8.0.1-rc1
  checker)                           |
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 I'd like to try wrapping `solveEqualities` in `checkNoErrs`.  Yes, we fail
 more, but let's see if that worsens behaviour.

 My reasoning: if we take a type signature that has kind errors in it, and
 proceed onwards with a kind-incorrect type, we are likely to get hard-to-
 explain knock-on errors down the line. Let's fail faster.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11520#comment:7>
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