[GHC] #9820: Apparently inconsistent behaviour in the presence of OverlappingInstances

GHC ghc-devs at haskell.org
Tue Nov 25 03:13:16 UTC 2014


#9820: Apparently inconsistent behaviour in the presence of OverlappingInstances
-------------------------------------+-------------------------------------
              Reporter:  kosmikus    |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
  (Type checker)                     |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:  #7296
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by goldfire):

 * related:   => #7296


Comment:

 This is by design, for better or worse. See #7296 for an explanation. I'm
 sure the fix -- that is, redesign -- for that ticket and this one will be
 the same, but I think it's worth leaving both tickets open, as the
 examples are slightly different.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9820#comment:3>
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