diff options
Diffstat (limited to 'libraries/base/Data/Unique.hs')
| -rw-r--r-- | libraries/base/Data/Unique.hs | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/libraries/base/Data/Unique.hs b/libraries/base/Data/Unique.hs index 2db9247572..eef6256395 100644 --- a/libraries/base/Data/Unique.hs +++ b/libraries/base/Data/Unique.hs @@ -6,7 +6,7 @@ -- Module : Data.Unique -- Copyright : (c) The University of Glasgow 2001 -- License : BSD-style (see the file libraries/base/LICENSE) --- +-- -- Maintainer : libraries@haskell.org -- Stability : experimental -- Portability : non-portable @@ -30,6 +30,15 @@ import Data.IORef -- | An abstract unique object. Objects of type 'Unique' may be -- compared for equality and ordering and hashed into 'Int'. +-- +-- >>> :{ +-- do x <- newUnique +-- print (x == x) +-- y <- newUnique +-- print (x == y) +-- :} +-- True +-- False newtype Unique = Unique Integer deriving (Eq,Ord) uniqSource :: IORef Integer |