one issue arising in practice is that we would like to havefromBool :: MonadPlus m => Bool -> m a but the current definition of guard would fix the type to fromBool :: MonadPlus m => Bool -> m () which would require type annotations for Booleans used as guards. see the attached example for an easy workaround.
what attachment, you ask? sorry, lack of sleep - now attached to this message. claus
Boolean.hs
Description: Binary data
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