[GHC] #11715: Constraint vs *

[GHC]

#11715: Constraint vs *
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        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler (Type    |              Version:  8.0.1-rc1
  checker)                           |
      Resolution:                    |             Keywords:  Typeable
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):

 How would we write the body for, say, `with :: c -> (c => r) -> r`? What
 about `whichOne :: c -> c -> (c => r) -> r` (which takes two elements of
 type `c`)?

 I'm worried that the disadvantages of comment:11 are a bit painful.
 Perhaps no worse than where we are now, though.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11715#comment:18>
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