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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"UnifiedDiffParserException on apparently sane file (2nd variant)","articleBody":"**Describe the bug**\r\n`UnifiedDiffReader.parseUnifiedDiff` throws UnifiedDiffParserException on a patch which apparently looks good: \r\n\r\nhttps://raw.githubusercontent.com/bazelbuild/bazel/master/third_party/aws-sdk-auth-lite/patches-vs-1.11.297/01-bazel-strip-unused.patch\r\n\r\n**To Reproduce**\r\nRun this program:\r\n\r\n```java\r\nString patch = new Scanner(new URL(\r\n    \"https://raw.githubusercontent.com/bazelbuild/bazel/master/third_party/aws-sdk-auth-lite/patches-vs-1.11.297/01-bazel-strip-unused.patch\"\r\n).openStream(), \"UTF-8\").useDelimiter(\"\\\\A\").next();\r\n\r\nUnifiedDiffReader.parseUnifiedDiff(new StringBufferInputStream(patch));\r\n```\r\n\r\n**Expected behavior**\r\n\r\nNo Exceptions.\r\n\r\n**Actual behavior**\r\n\r\nDec 14, 2020 9:49:46 PM com.github.difflib.unifieddiff.UnifiedDiffReader processLine\r\nWARNING:   \u003e\u003e\u003e no rule matched \\ No newline at end of file\r\nException in thread \"main\" com.github.difflib.unifieddiff.UnifiedDiffParserException: expected file start line not found\r\n\tat com.github.difflib.unifieddiff.UnifiedDiffReader.parse(UnifiedDiffReader.java:95)\r\n\tat com.github.difflib.unifieddiff.UnifiedDiffReader.parseUnifiedDiff(UnifiedDiffReader.java:146)\r\n...\r\n\r\n**System**\r\n - Java version: openjdk-11\r\n - Version: 4.9\r\n\r\n**Notes**\r\n\r\n:wave: java-diff-utils maintainers again! Here is another corner case I found. The patch comes from the Bazel project, so once again it's OK to include in tests.","author":{"url":"https://github.com/moio","@type":"Person","name":"moio"},"datePublished":"2020-12-14T20:51:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":13},"url":"https://github.com/107/java-diff-utils/issues/107"}