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Rob Rix 2019-10-08 15:35:07 -04:00
parent 3051c8cace
commit 711ec1957d
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semantic-tags/src/AST/Element.hs
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@ -16,6 +16,7 @@ instance (Element' side sub sup, side ~ Find sub sup) => Element sub sup where
prj = prj' @side
-- | A pattern synonym to conveniently project out matching elements.
pattern Prj :: Element sub sup => sub a -> sup a
pattern Prj sub <- (prj -> Just sub)