[GHC] #12526: regression in type inference with respect to type families

[GHC]

#12526: regression in type inference with respect to type families
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        Reporter:  Lemming           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10634            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by Lemming):

 * related:  10634 => #10634


Comment:

 I am ok with defering the solution to 8.2.
 These simulated injective type functions seem to be a constant source of
 trouble. How do other people cope with them? Are they all using real
 injective type functions instead?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12526#comment:13>
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