[GHC] #10532: Unnecessary constraints when using overlapping instances

[GHC]

#10532: Unnecessary constraints when using overlapping instances
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        Reporter:  MikeIzbicki       |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler (Type    |                 Version:  7.10.1
  checker)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by MikeIzbicki):

 Would something bad happen if GHC had the behavior I expected of
 automatically inferring the constraint?

 @rwbarton I don't understand what you mean.  If I open the code in ghci I
 can evaluate the function f on any input whenever ghc actually compiles
 the code.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10532#comment:6>
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