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Rob Rix 2017-09-11 09:50:14 -04:00
parent 8e12798a05
commit c8706d6c4b
1 changed files with 1 additions and 0 deletions
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src/Data/Functor/Binding.hs
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@ -35,6 +35,7 @@ bindings :: BindingF f recur -> [(Metavar, recur)]
bindings (Let vars _) = vars bindings (Let vars _) = vars
bindings _ = [] bindings _ = []
freeMetavariables :: (Foldable syntax, Functor syntax, Recursive t, Base t ~ BindingF syntax) => t -> Set.Set Metavar freeMetavariables :: (Foldable syntax, Functor syntax, Recursive t, Base t ~ BindingF syntax) => t -> Set.Set Metavar
freeMetavariables = cata $ \ diff -> case diff of freeMetavariables = cata $ \ diff -> case diff of
Let bindings body -> foldMap snd bindings <> foldr Set.delete (fold body) (fst <$> bindings) Let bindings body -> foldMap snd bindings <> foldr Set.delete (fold body) (fst <$> bindings)