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This patch adds the flag `-ddump-json` which dumps all the compiler output as a JSON array. This allows tooling to more easily parse GHC's output to display to users. The flag is currently experimental and will hopefully be refined for the next release. In particular I have avoided any changes which involve significant refactoring and provided what is easy given the current infrastructure. Reviewers: austin, bgamari Reviewed By: bgamari Subscribers: DanielG, gracjan, thomie Differential Revision: https://phabricator.haskell.org/D3010 GHC Trac Issues: #13190
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