[GHC] #11721: GADT-syntax data constructors don't work well with TypeApplications

[GHC]

#11721: GADT-syntax data constructors don't work well with TypeApplications
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                Owner:  RyanGlScott
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.1
      Resolution:  fixed             |             Keywords:
                                     |  TypeApplications
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13848, #12025    |  Differential Rev(s):  Phab:D3687,
       Wiki Page:                    |  Phab:D4070
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Comment (by Ryan Scott <ryan.gl.scott@…>):

 In [changeset:"341d3a7896385f14580d048ea7681232e5b242ce/ghc"
 341d3a78/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="341d3a7896385f14580d048ea7681232e5b242ce"
 Incorporate changes from #11721 into Template Haskell

 Summary:
 #11721 changed the order of type variables in GADT
 constructor type signatures, but these changes weren't reflected in
 Template Haskell reification of GADTs. Let's do that.

 Along the way, I:

 * noticed that the `T13885` test was claiming to test TH reification
   of GADTs, but the reified data type wasn't actually a GADT! Since
   this patch touches that part of the codebase, I decided to fix
   this.
 * incorporated some feedback from @simonpj in
   https://phabricator.haskell.org/D3687#113566. (These changes alone
   don't account for any different in behavior.)

 Test Plan: make test TEST=T11721_TH

 Reviewers: goldfire, austin, bgamari, simonpj

 Reviewed By: goldfire, bgamari, simonpj

 Subscribers: rwbarton, thomie, simonpj

 GHC Trac Issues: #11721

 Differential Revision: https://phabricator.haskell.org/D4070
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11721#comment:15>
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