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deque-blog/dsl_arithmetic_2_dependencies.hs

Last active January 20, 2017 20:34
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dsl_arithmetic_2_dependencies.hs
dependencies :: Expr -> Set.Set Id
dependencies = cata algebra where
algebra (Cst _) = Set.empty
algebra (Var x) = Set.singleton x
algebra (Op _ xs) = Set.unions xs
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