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Define maxBoundMetavariable using a helper.

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This commit is contained in:
Rob Rix 2017-09-10 19:55:08 +01:00
parent 3e2c883b3a
commit d68a8790ce
1 changed files with 5 additions and 2 deletions
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7
src/Diff.hs
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@ -54,9 +54,12 @@ freeMetavariables = cata $ \ diff -> case diff of
maxBoundMetavariable :: (Foldable syntax, Functor syntax) => Diff syntax ann -> Maybe Metavar
maxBoundMetavariable = cata $ \ diff -> case diff of
Copy bindings _ -> foldr (max . Just . fst) Nothing bindings
Copy bindings _ -> foldMaxMap (Just . fst) bindings
Var _ -> Nothing
Patch patch -> foldr (max . foldr max Nothing) Nothing patch
Patch patch -> foldMaxMap (foldMaxMap id) patch
foldMaxMap :: (Foldable t, Ord b) => (a -> Maybe b) -> t a -> Maybe b
foldMaxMap f = foldr (max . f) Nothing
newtype Env a = Env { unEnv :: [(Metavar, a)] }