[GHC] #9433: Partially applied type family allowed but unusable

[GHC]

#9433: Partially applied type family allowed but unusable
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              Reporter:  hesselink   |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.9
  (Type checker)                     |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:  GHC         |  Related Tickets:
  accepts invalid program            |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"8ff4671422090acf9146e3a90dd38e2c6f72aebb/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="8ff4671422090acf9146e3a90dd38e2c6f72aebb"
 Make Core Lint check for un-saturated type applications

 Un-saturated type-family and type-synonym applications are
 detected in the front end, but for some reason Lint wasn't
 looking for them.

 I came across this when wondering why Trac #9433 didn't give
 a Core Lint error
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9433#comment:1>
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