[GHC] #15743: Nail down the Required/Inferred/Specified story

[GHC]

#15743: Nail down the Required/Inferred/Specified story
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        Reporter:  simonpj           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 Ningning (@xnning) and I just had a great conversation about all this.
 Amazingly, `Bad` is accepted by Idris (`data T5 : (a : _) -> (c : Proxy b)
 -> (d : Proxy a) -> (x : SameKind b d) -> Type`), as is my `T` in
 comment:1. This means Idris must surely be doing ScopedSort or something
 very similar. We can't let ourselves be out-inferred by them, so let's do
 it, too.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15743#comment:6>
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