Haskell Language Overloaded Literals List Literals
Example
GHC's OverloadedLists extension allows you to construct list-like data structures with the list literal syntax.
This allows you to Data.Map like this:
> :set -XOverloadedLists
> import qualified Data.Map as M
> M.lookup "foo" [("foo", 1), ("bar", 2)]
Just 1
Instead of this (note the use of the extra M.fromList):
> import Data.Map as M
> M.lookup "foo" (M.fromList [("foo", 1), ("bar", 2)])
Just 1
