[Haskell-cafe] Generalized null / zero

[adam vogt]

Hi Alvaro,

1. null . toList :: Foldable t => t a -> Bool
2. mappend, mplus, <|>  are supposed to drop arguments that are mempty,
mzero, empty respectively. There's no requirement to prefer the first
argument, but that's what the MonadPlus Maybe instance does at least.

--
Adam
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