Commit fbd9b886 authored by David Feuer's avatar David Feuer Committed by Ben Gamari

Implement equalKeysUFM the right way

Originally, we compared the key lists, which was kind of silly.
Then I changed it to something fancier ... and also silly.
This is much more reasonable, should be faster, and is nice and

Reviewers: bgamari

Reviewed By: bgamari

Subscribers: rwbarton, thomie, carter

Differential Revision:
parent 256577fb
......@@ -78,12 +78,10 @@ import Outputable
import Data.List (foldl')
import qualified Data.IntMap as M
import qualified Data.IntMap.Merge.Lazy as M
import Control.Applicative (Const (..))
import qualified Data.Monoid as Mon
import qualified Data.IntSet as S
import Data.Data
import qualified Data.Semigroup as Semi
import Data.Functor.Classes (Eq1 (..))
newtype UniqFM ele = UFM (M.IntMap ele)
......@@ -342,10 +340,7 @@ ufmToIntMap (UFM m) = m
-- Determines whether two 'UniqFm's contain the same keys.
equalKeysUFM :: UniqFM a -> UniqFM b -> Bool
equalKeysUFM (UFM m1) (UFM m2) = Mon.getAll $ getConst $
M.mergeA (M.traverseMissing (\_ _ -> Const (Mon.All False)))
(M.traverseMissing (\_ _ -> Const (Mon.All False)))
(M.zipWithAMatched (\_ _ _ -> Const (Mon.All True))) m1 m2
equalKeysUFM (UFM m1) (UFM m2) = liftEq (\_ _ -> True) m1 m2
-- Instances
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