[GHC] #15480: Rename SigTv

[GHC]

#15480: Rename SigTv
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        Reporter:  nomeata           |                Owner:  (none)
            Type:  task              |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.5
      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:D5074
       Wiki Page:                    |
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Comment (by Joachim Breitner <mail@…>):

 In [changeset:"a50244c6a87176a4df8d41e6a1a3f102ba129032/ghc" a50244c/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="a50244c6a87176a4df8d41e6a1a3f102ba129032"
 Rename SigTv to TyVarTv (#15480)

 because since #15050, these are no longer used in pattern SIGnatures,
 but still in other places where meta-variables should only be unified
 with TYpe VARiables.

 I also found mentions of `SigTv` in parts of the renamer and desugarer
 that do not seem to directly relate to `SigTv` as used in the type
 checker, but rather to uses of `forall a.` in type signatures. I renamed
 these to `ScopedTv`.

 Differential Revision: https://phabricator.haskell.org/D5074
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15480#comment:3>
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