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MonadCombine and MonadFilter weak laws #1116

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peterneyens opened this issue Jun 11, 2016 · 1 comment
Closed

MonadCombine and MonadFilter weak laws #1116

peterneyens opened this issue Jun 11, 2016 · 1 comment

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@peterneyens
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MonadCombine Instances for XorT and OptionT fail the following laws (all defined in AlternativeLaws):

  • right absorbtion
  • right distributivity
  • left distributivity

MonadFilter instances for XorT and OptionT fail the right empty law (defined in MonadFilterLaws).

@mpilquist mentioned in the code when he created XorT that we could split both laws in weak/strong versions.
@peterneyens
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It seems this is a duplicate of #694

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@peterneyens