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Stefan HallerandClaude Opus 5
27edfa2008
Parse is lenient: it takes any text and reads a diff out of it, which is what we want when we hand it a diff, but it has no way to say "this isn't one". We're about to parse the *rendered* contents of a diff view, which a diff renderer is free to restructure — putting the line numbers in a gutter, say, shifts the +/- marker off the start of each body line, so every line reads as context and the parse silently lies about which lines are changes. Comparing each hunk's body against the lengths its header declares catches exactly that, without teaching us anything about any particular renderer's layout: a faithful unified diff agrees with its headers, a restructured one doesn't. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>