[GHC] #8506: misleading error message for duplicate type class instances

[GHC]

#8506: misleading error message for duplicate type class instances
--------------------------------------------+------------------------------
        Reporter:  carter                   |            Owner:
            Type:  bug                      |           Status:  new
        Priority:  normal                   |        Milestone:
       Component:  Compiler (Type checker)  |          Version:  7.6.3
      Resolution:                           |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:
 Type of failure:  None/Unknown             |  Unknown/Multiple
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:
--------------------------------------------+------------------------------

Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"8a4d858e9df67c35c5f59e2f6382ece02fc4c214/testsuite"]:
 {{{
 #!CommitTicketReference repository="testsuite"
 revision="8a4d858e9df67c35c5f59e2f6382ece02fc4c214"
 Test Trac #8506
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8506#comment:6>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler