[GHC] #6018: Injective type families

[GHC]

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

Comment (by hpacheco):

 To get going, I wouldn't mind if the onus of proving that the type family
 is indeed injective fell on me, in an unsafe way.
 But I understand that it is clearly not a feature that you should blindly
 introduce in mainstream GHC...
 I may look into it in the future if I ever find the time, but I doubt it.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/6018#comment:30>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler