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{-# LANGUAGE BangPatterns #-}
module Proposal229e ((!), f) where
(!) :: Maybe a -> a -> (a, a)
f :: a -> a
-- the preceding '}' is not from a comment,
-- so (!) is tight infix (therefore an operator)
Nothing{}!x = (x, x)
-- the following '{' opens a multi-line comment,
-- so (!) is loose infix (therefore an operator)
Just a !{-comment-}x = (a, x)
-- the preceding '}' is closing a multi-line comment,
-- so (!) is prefix (therefore a bang pattern)
f{-comment-}!x = x
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