[GHC] #11463: Template Haskell applies too many arguments to kind synonym

[GHC]

#11463: Template Haskell applies too many arguments to kind synonym
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        Reporter:  RyanGlScott       |                Owner:
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Template Haskell  |              Version:  8.0.1-rc1
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2081
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"02a5c580b6078630842f4c3db5d92631fada21e9/ghc" 02a5c58/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="02a5c580b6078630842f4c3db5d92631fada21e9"
 Filter out invisible kind arguments during TH reification

 Previously, all kind arguments were being reified, which would cause
 something like this:

 ```
 type Id a = a
 data Proxy (a :: Id k) = Proxy
 ```

 to output

 ```
 data Proxy (a :: Id * k) = Proxy
 ```

 when `Proxy`'s `Info` is reified. The fix is simple: simply call
 `filterOutInvisibleTypes` on the kind arguments of a kind synonym
 application.

 Fixes #11463.

 Test Plan: ./validate

 Reviewers: austin, bgamari, goldfire

 Reviewed By: goldfire

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2081

 GHC Trac Issues: #11463
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11463#comment:5>
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