[GHC] #15330: Error message prints invisible kind arguments in a visible matter

[GHC]

#15330: Error message prints invisible kind arguments in a visible matter
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler (Type    |              Version:  8.4.3
  checker)                           |
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Poor/confusing    |  Unknown/Multiple
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Let's ''not'' do this in `Type`, but rather in `IfaceType`.  For `Type` it
 is simply redundant info that we'll have to carry around and maintain.  We
 only need it for pretty-printing.

 `IfaceType` (now a slight misnomer) is intended for serialisation, either
 to the user or to a binary file, so adding extra info makes sense.

 In practice, we are going to gather up all the args of a chain of `AppTy`s
 before pretty-printing, so we can lay them out nicely.  So maybe we should
 use
 {{{
   | IfaceAppTy     IfaceType IfaceTcArgs
 }}}
 and then rename `IfaceTcArgs` to `IfaceAppArgs`.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15330#comment:5>
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