[GHC] #2600: Bind type variables in RULES

[GHC]

#2600: Bind type variables in RULES
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        Reporter:  simonpj           |                Owner:  simonpj
            Type:  feature request   |               Status:  new
        Priority:  lowest            |            Milestone:
       Component:  Compiler          |              Version:  6.8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #2110             |  Differential Rev(s):  Phab:D4894
       Wiki Page:                    |
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Comment (by Richard Eisenberg <rae@…>):

 In [changeset:"512eeb9bb9a81e915bfab25ca16bc87c62252064/ghc" 512eeb9/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="512eeb9bb9a81e915bfab25ca16bc87c62252064"
 More explicit foralls (GHC Proposal 0007)

 Allow the user to explicitly bind type/kind variables in type and data
 family instances (including associated instances), closed type family
 equations, and RULES pragmas. Follows the specification of GHC
 Proposal 0007, also fixes #2600. Advised by Richard Eisenberg.

 This modifies the Template Haskell AST -- old code may break!

 Other Changes:
 - convert HsRule to a record
 - make rnHsSigWcType more general
 - add repMaybe to DsMeta

 Includes submodule update for Haddock.

 Test Plan: validate

 Reviewers: goldfire, bgamari, alanz

 Subscribers: simonpj, RyanGlScott, goldfire, rwbarton,
              thomie, mpickering, carter

 GHC Trac Issues: #2600, #14268

 Differential Revision: https://phabricator.haskell.org/D4894
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2600#comment:25>
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