Derived types unequal with let binding
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The types of x and y are different. This breaks the replacing equals with equals gives equals property. I am not sure whether this is a bug, but I would be very keen to know whether it is.
class X l z b m | l -> z b where p:: (Show a, Show b, Show b') => l a b -> m (l a b') e::(Show a, Show b) => l a b -> m [z] foo :: (X l a b m, Show b, Show a1) => [a] -> l a1 b -> m [(Int, Int, b)] foo = undefined o :: (Show z1, Show b, X l z b m) =>(Int, Int, b) -> l a1 b -> m (l z1 b) o = undefined x f r = do es <- e r something <- p r xxx <- foo es r foldM (flip o) something (map f xxx) y f r = do es <- e r something <- p r xxx <- foo es r let abc = map f xxx foldM (flip o) something abc