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Rob Rix 2019-10-08 15:34:47 -04:00
parent da227888ce
commit 3051c8cace
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@ -19,6 +19,7 @@ instance (Element' side sub sup, side ~ Find sub sup) => Element sub sup where
pattern Prj :: Element sub sup => sub a -> sup a
pattern Prj sub <- (prj -> Just sub)
data Side = None | Here | L | R
type family Find sub sup :: Side where