René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"macOS /usr/bin/patch cause obscure failures and stalls","articleBody":"macOS' /usr/bin/patch and GNU patch have very subtle incompatibilities that cause only some \"more advanced\" tests to fail in obscure and very time-consuming ways - while other tests pass. In some cases (depending on test threads racing), the lack of newlines in some test data even causes the whole test suite to stall.\n\n\n```\nfailures:\n    context_diff::tests::test_permutations\n    context_diff::tests::test_permutations_empty_lines\n    context_diff::tests::test_permutations_reverse\n    unified_diff::tests::test_permutations\n    unified_diff::tests::test_permutations_empty_lines\n    unified_diff::tests::test_permutations_missing_line_ending\n    unified_diff::tests::test_permutations_reverse\n\ntest result: FAILED. 118 passed; 7 failed; 0 ignored; 0 measured; 0 filtered out; finished in 13.50s\n\n```\nExamples:\n\n```\ndiff: \"--- target/unified-diff//alef\\t2026-05-06 17:34:45.259112903 -0400\\n+++ target/unified-diff//alef\\t2026-05-06 17:34:45.259112903 -0400\\n@@ -1,4 +1,4 @@\\n-a\\n-c\\n+b\\n+d\\n f\\n h\\n@@ -5,2 +5,2 @@\\n-i\\n+j\\n l\\n\"\nalef: \"a\\nc\\nf\\nh\\ni\\nl\\n\"\nbet: \"b\\nd\\nf\\nh\\nj\\nl\\n\"\npatching file 'target/unified-diff//alef'\n1 out of 2 hunks failed--saving rejects to 'target/unified-diff//alef.rej'\n\n---- context_diff::tests::test_permutations_reverse stdout ----\n\nthread 'context_diff::tests::test_permutations_reverse' (14471508) panicked at src/context_diff.rs:718:33:\nassertion failed: `(left == right)`\n\nDiff \u003c left / right \u003e :\n [\n     98,\n     10,\n\u003c    100,\n\u003c    10,\n\u003c    99,\n\u003c    10,\n\u003c    98,\n\u003c    10,\n\u003c    97,\n\u003c    10,\n ]\n\n```","author":{"url":"https://github.com/marc-hb","@type":"Person","name":"marc-hb"},"datePublished":"2026-05-06T21:36:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/225/diffutils/issues/225"}