Created
December 1, 2017 14:53
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| decAnd : Dec a -> Dec b -> Dec (a,b) | |
| decAnd (Yes a) (Yes b) = Yes (a, b) | |
| decAnd _ (No nb) = No (nb . snd) | |
| decAnd (No na) _ = No (na . fst) | |
| decOr : Dec a -> Dec b -> Dec (Either a b) | |
| decOr (Yes a) _ = Yes (Left a) | |
| decOr _ (Yes b) = Yes (Right b) | |
| decOr (No na) (No nb) = No (either na nb) |
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