[GHC] #13705: Failure of improvement for type-family dependencies

[GHC]

#13705: Failure of improvement for type-family dependencies
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        Reporter:  simonpj           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"cec7d580c2c033c3aaeba093752328d8f3635cd0/ghc" cec7d58/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="cec7d580c2c033c3aaeba093752328d8f3635cd0"
 Fix the pure unifier

 This patch fixes Trac #13705, by fixing a long-standing outright bug
 in the pure unifier.  I'm surprised this hasn't caused more trouble
 before now!
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13705#comment:3>
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