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Thomas Miedema authored
On a test failure, we show a diff between the expected and the actual output. The method of how we do this has changed a couple of times: * In 2007: 9951189c "On failure, diff the normalised test outputs" * In 2011: 3019b1e4 "When the output files differ, present the diffs between the *actual* output, not the normalised output. The latter may have newlines removed, making the diff unreadable." * In 2015 (now): do something in between. - Do apply the normalisers again, to make the diff smaller (only showing the actual problem). - But don't apply normalise_whitespace, as it indeed makes the diff unreadable. Differential Revision: https://phabricator.haskell.org/D984
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