[GHC] #10009: type inference regression when faking injective type families

[GHC]

#10009: type inference regression when faking injective type families
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        Reporter:  aavogt            |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:  7.10.1
       Component:  Compiler (Type    |                 Version:  7.10.1-rc1
  checker)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  GHC rejects       |               Test Case:
  valid program                      |                Blocking:
      Blocked By:                    |  Differential Revisions:
 Related Tickets:                    |
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Comment (by darchon):

 It is not mission critical for me. I just encountered a piece of code of
 my own that works on 7.8.4, but complains (perhaps rightfully so) about
 ambiguous types in 7.10.1-rc3. I just hit on this issue when googling the
 error message, and my question was merely if a fix in HEAD slipped
 through, and did not make it in 7.10.1-rc3.

 Christiaan

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10009#comment:12>
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