[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:  closed
        Priority:  highest           |               Milestone:  7.12.1
       Component:  Compiler (Type    |                 Version:  7.10.1-rc1
  checker)                           |                Keywords:
      Resolution:  fixed             |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  GHC rejects       |               Test Case:
  valid program                      |                Blocking:
      Blocked By:                    |  Differential Revisions:
 Related Tickets:  #10226            |
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Changes (by Lemming):

 * related:  #10226, #10634 => #10226


Comment:

 I was hit by this bug in `hmm-hmatrix` but I remember that I used this
 pattern in more places. I added #10634, which however is much abstracted
 from the original code.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10009#comment:39>
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