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This is backport of [1] for GHC's copy of Pretty. See Note [Differences between libraries/pretty and compiler/utils/Pretty.hs]. [1] http://git.haskell.org/packages/pretty.git/commit/bbe9270c5f849a5bb74c9166a5f4202cfb0dba22 https://github.com/haskell/pretty/issues/32 https://github.com/haskell/pretty/pull/35 Reviewers: bgamari, austin Reviewed By: austin Differential Revision: https://phabricator.haskell.org/D2397 GHC Trac Issues: #12227
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