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Hack idiom-brackets using Source Plugin.
As nobody (?) writes their lists as ([1, 2, 3]), we can steal that syntax!
{-# OPTIONS -fplugin=IdiomsPlugin #-}
module Main (main) where
main :: IO ()
main = do
-- Just "foobar"
print ([ mappend (Just "foo") (Just "bar") ])
-- Nothing
print ([ const (Just "foo") Nothing ])
-- Just 3
print ([ (+) (Just 1) (Just (2 :: Int)) ])