[GHC] #13959: substTyVar's definition is highly dubious

[GHC]

#13959: substTyVar's definition is highly dubious
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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:D3732
       Wiki Page:                    |
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Comment (by goldfire):

 Who arranges for the members of the in-scope set to have substituted
 kinds? It's not uncommon to start a substitution with some in-scope set
 (derived from a call to `tyCoVarsOfTypes` or similar) and then build it
 from there. No one touches the in-scope set.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13959#comment:8>
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