[GHC] #6018: Injective type families

[GHC]

#6018: Injective type families
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              Reporter:  lunaris     |            Owner:  jstolarek
                  Type:  feature     |           Status:  new
  request                            |        Milestone:  7.10.1
              Priority:  normal      |          Version:  7.4.1
             Component:  Compiler    |         Keywords:  TypeFamilies,
            Resolution:              |  Injective
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:  #4259
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by jstolarek):

 Replying to [comment:51 goldfire]:
 > Replying to [comment:49 jstolarek]:
 > > I don't think that restricting the use of `result` word in type family
 head is a big problem - we've already done that with `role`.
 >
 > The use of `role` doesn't steal syntax: it can be used only after the
 word `type` in a top-level declaration, where a capitalized identifier is
 expected.
 Oops, sorry for defamation then ;-) Still, I think that the price to pay
 for using `result` will not be that high.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/6018#comment:54>
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