[GHC] #8500: Default associated type instances not instantiated

[GHC]

#8500: Default associated type instances not instantiated
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        Reporter:  goldfire          |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"6f331d69e50f13626b65ab76de408a49caebd4f6/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="6f331d69e50f13626b65ab76de408a49caebd4f6"
 Fix marshalling of IfaceAt to and from interface files

 I had forgotten about Note [CoAxBranch type variables] in CoAxiom

 This patch fixes Trac #8500
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8500#comment:2>
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