[GHC] #14004: G

[GHC]

#14004: G
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        Reporter:  zaoqi             |                Owner:  (none)
            Type:  feature request   |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:  invalid           |             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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Changes (by bgamari):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 In general it's appreciated if you can provide at very least a title for
 new tickets.

 In this particular case I think the error message pretty much explains
 what's going on here: there are two instances which may match your
 request. GHC in general refuses to choose arbitrarily. If you want to
 force GHC to choose arbitrarily then you can use `IncoherentInstances`,
 but you get to keep both pieces if your program breaks.

 Closing as invalid but feel free to reopen if I have misunderstood your
 request.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14004#comment:1>
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