January 11, 2026 marks the day that the first PR I made to the Rust repository officially got merged into the main branch. :) Context The PR I made revolves around std::fs::create_dir_all() function. To quote what the function does: Recursively crea...
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One useful regression case for the iterative walk is a parent appearing between the upward scan and the downward creation pass. Pairing that with an existing non-directory component would exercise the distinction you describe between AlreadyExists/is_dir and errors that must propagate. It would also complement the deep-path test without relying on one platform's stack size.