[GHC] #16013: :kind! accepts unsaturated type aliases

[GHC]

#16013: :kind! accepts unsaturated type aliases
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        Reporter:  dmwit             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.3
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13962            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by dmwit):

 Sure, I understand the motivation.

 It seems like a sensible middle ground would be to special-case only top-
 level unsaturated type aliases/families, and not wholesale allow
 unsaturation. And indeed the way the documentation was written makes it
 sound like that's the case: it uses the precise language ":kind even
 allows you to write a partial application of a type synonym", whereas `Id
 Foo` is not a partial application of a type synonym but rather the
 application of a type (family) to a partial application of a type synonym.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16013#comment:3>
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