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📝 Side.

This commit is contained in:
Rob Rix 2019-10-08 15:40:28 -04:00
parent 31ba6be9d8
commit abb6eff40f
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@ -21,6 +21,7 @@ pattern Prj :: Element sub sup => sub a -> sup a
pattern Prj sub <- (prj -> Just sub) pattern Prj sub <- (prj -> Just sub)
-- | Where does the element occur in the tree?
data Side = None | Here | L | R data Side = None | Here | L | R
type family Find sub sup :: Side where type family Find sub sup :: Side where