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Diffstat (limited to 'compiler/GHC/Data/Bag.hs')
| -rw-r--r-- | compiler/GHC/Data/Bag.hs | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/compiler/GHC/Data/Bag.hs b/compiler/GHC/Data/Bag.hs index e314309efc..338b463832 100644 --- a/compiler/GHC/Data/Bag.hs +++ b/compiler/GHC/Data/Bag.hs @@ -37,6 +37,7 @@ import Data.Maybe( mapMaybe ) import Data.List ( partition, mapAccumL ) import Data.List.NonEmpty ( NonEmpty(..) ) import qualified Data.Foldable as Foldable +import qualified Data.Semigroup ( (<>) ) infixr 3 `consBag` infixl 3 `snocBag` @@ -343,3 +344,9 @@ instance IsList (Bag a) where type Item (Bag a) = a fromList = listToBag toList = bagToList + +instance Semigroup (Bag a) where + (<>) = unionBags + +instance Monoid (Bag a) where + mempty = emptyBag |