[GHC] #8705: Type inference regression with local dictionaries

[GHC]

#8705: Type inference regression with local dictionaries
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        Reporter:  goldfire                 |            Owner:
            Type:  bug                      |           Status:  new
        Priority:  high                     |        Milestone:  7.8.1
       Component:  Compiler (Type checker)  |          Version:  7.8.1-rc1
      Resolution:                           |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:
 Type of failure:  None/Unknown             |  Unknown/Multiple
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:
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Changes (by goldfire):

 * priority:  normal => high
 * version:  7.7 => 7.8.1-rc1
 * milestone:   => 7.8.1


Comment:

 Tweaking settings on the ticket to give it perhaps higher visibility. This
 bug is a type inference regression that I believe will hit the type system
 power users and would be embarrassing if we don't fix before the release.
 I've confirmed that the error happens in 7.8rc1.

 I haven't put time into looking for the source of the problem, but I think
 it will be in code I'm not (yet) deeply familiar with. If the release is
 approaching and this is still around, please ping me and I'll see what I
 can do.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8705#comment:2>
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