[GHC] #12088: Type/data family instances in kind checking

[GHC]

#12088: Type/data family instances in kind checking
-------------------------------------+-------------------------------------
        Reporter:  alexvieth         |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11348, #12239    |  Differential Rev(s):  Phab:D2272
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by alexvieth):

 Replying to [comment:28 simonpj]:
 > It is cool but it should have a separate ticket.  Richard can you do
 that?

 It's here: #11962

 Simon, what do you think of my idea from comment 25?

 > Bottom line. Instead of getting in deeper, pull back. Do somthing that
 is simple to explain, predicatable, and simple to implement, even if it' a
 little less convenient.

 The proposed phasing annotations might be convenient for ghc developers
 but they'd be inconvenient and surprising for ghc users. I appreciate
 that, at the term level, I don't need to worry about the order of my
 definitions. I'd like the same to be true at type level if possible, and I
 think it is possible. I'm just not sure if it will be simple to implement.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12088#comment:31>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler