[GHC] #6018: Injective type families

[GHC]

#6018: Injective type families
-------------------------------------+-------------------------------------
              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:              |
-------------------------------------+-------------------------------------

Comment (by jstolarek):

 Replying to [comment:52 goldfire]:
 > Here, "head" means the head of the RHS type, not the type declaration --
 it's the root of the type's AST. Does that help?
 Yes, now I fully understand.

 Also, if I understood correctly it is possible to have both injectivity
 and head-injectivity in the compiler, right?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/6018#comment:53>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler