[GHC] #8338: Incoherent instances without -XIncoherentInstances

[GHC]

#8338: Incoherent instances without -XIncoherentInstances
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        Reporter:  goldfire          |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  #2356
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Changes (by rwbarton):

 * related:   => #2356


Comment:

 GHC has allowed multiple instances for the same type and class to coexist
 in a single program for a long time without any fancy language features.
 See discussion at #2356.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8338#comment:4>
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