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Diffstat (limited to 'compiler/GHC/Utils/Misc.hs')
| -rw-r--r-- | compiler/GHC/Utils/Misc.hs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/compiler/GHC/Utils/Misc.hs b/compiler/GHC/Utils/Misc.hs index fbf52d1bdb..29cad99cd3 100644 --- a/compiler/GHC/Utils/Misc.hs +++ b/compiler/GHC/Utils/Misc.hs @@ -493,6 +493,10 @@ isSingleton _ = False notNull :: Foldable f => f a -> Bool notNull = not . null +-- | Utility function to go from a singleton list to it's element. +-- +-- Wether or not the argument is a singleton list is only checked +-- in debug builds. only :: [a] -> a #if defined(DEBUG) only [a] = a |