Oops [Fwd: Re: Allowing duplicate instances in GHC 6.4]

Robert van Herk rherk at cs.uu.nl
Thu Mar 31 10:05:47 EST 2005

Sorry, this is the compiler error I get:

 No instances for (KeyHasValue MyKeyVal k' v',
                      Datasource.Tools.FakePrelude.TypeEq Float k' z,
                      Datasource' z [MyKeyVal] [MyKeyVal] Float Int)
When I am trying to do

  do { createJoinedDS' x x;
          (joined,(v::Maybe Int)) <- _dsread joined (2.0::Float);

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From: Robert van Herk <rherk at cs.uu.nl>
Subject: Re: Allowing duplicate instances in GHC 6.4
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