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Not properly checking for invalid escape seqeunce \X #5656
Description
Summary
RustPython doesn't report any errors running the file RustPython/extra_tests/snippets/builtin_bytes.py
cargo run --release -- /home/hbina085/git/RustPython/extra_tests/snippets/builtin_bytes.py
Finished `release` profile [optimized] target(s) in 0.15s
Running `target/release/rustpython /home/hbina085/git/RustPython/extra_tests/snippets/builtin_bytes.py`
Expected
But CPython does,
python /home/hbina085/git/RustPython/extra_tests/snippets/builtin_bytes.py
/home/hbina085/git/RustPython/extra_tests/snippets/builtin_bytes.py:23: SyntaxWarning: invalid escape sequence '\X'
assert b"omkmok\Xaa" == bytes([111, 109, 107, 109, 111, 107, 92, 88, 97, 97])
The issue is that RustPython does not check if \X is a valid escape sequence.
Activity
youknowone commentedon Jul 4, 2025
Could you share cpython version? We run every test under extra_tests/snippets/ using CPython to ensure the result are the same on both side. Maybe the warning isn't checked in the CI..?
youknowone commentedon Oct 6, 2026
The originally reported problem no longer reproduces on current main. Closing per the recheck in #8982.
— commented by Grok 4.6