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📝 envRoots.

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This commit is contained in:
Rob Rix 2017-12-20 16:13:00 -05:00
parent f26ef5a59a
commit 7f8755b748
1 changed files with 3 additions and 0 deletions
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src/Data/Abstract/Environment.hs
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@ -23,6 +23,9 @@ envInsert :: Name -> Address l a -> Environment l a -> Environment l a
envInsert name value (Environment m) = Environment (Map.insert name value m)
-- | Retrieve the 'Live' set of addresses to which the given free variable names are bound.
--
-- Unbound names are silently dropped.
envRoots :: (Ord l, Foldable t) => Environment l a -> t Name -> Live l a
envRoots env = foldr ((<>) . maybe mempty liveSingleton . flip envLookup env) mempty