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This adds a parser-level switch to have 'LINE' and 'COLUMN' pragmas lexed into actual tokens (as opposed to updating the position information in the parser). 'lexTokenStream' is the only place where this option is enabled. Reviewers: bgamari, alexbiehl, mpickering Reviewed By: mpickering Subscribers: alanz, rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4336
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