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Diffstat (limited to 'libraries/base/Data/Foldable.hs')
| -rw-r--r-- | libraries/base/Data/Foldable.hs | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/libraries/base/Data/Foldable.hs b/libraries/base/Data/Foldable.hs index 1d9fc92ca5..e33d45efcf 100644 --- a/libraries/base/Data/Foldable.hs +++ b/libraries/base/Data/Foldable.hs @@ -506,6 +506,9 @@ sequence_ :: (Foldable t, Monad m) => t (m a) -> m () sequence_ = foldr (>>) (return ()) -- | The sum of a collection of actions, generalizing 'concat'. +-- +-- asum [Just "Hello", Nothing, Just "World"] +-- Just "Hello" asum :: (Foldable t, Alternative f) => t (f a) -> f a {-# INLINE asum #-} asum = foldr (<|>) empty |