[GHC] #12382: Rename clashing type variables more consistently

[GHC]

#12382: Rename clashing type variables more consistently
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        Reporter:  nomeata           |                Owner:  nomeata
            Type:  feature request   |               Status:  patch
        Priority:  low               |            Milestone:
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      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:D2402
       Wiki Page:                    |
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Comment (by Joachim Breitner <mail@…>):

 In [changeset:"18ac80ff729eb19ec370ead9f9275b3bc32c1f81/ghc"
 18ac80ff/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="18ac80ff729eb19ec370ead9f9275b3bc32c1f81"
 tidyType: Rename variables of nested forall at once

 this refactoring commit prepares for fixing #12382, which can now be
 implemented soley in tidyTyCoVarBndrs.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12382#comment:8>
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