[2.7] bpo-35214: Fix OOB memory access in unicode escape parser (GH-10506)#10538
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Discovered using clang's MemorySanitizer.
An msan build will fail by simply executing: ./python -c 'u"\N"'
(cherry picked from commit 746b2d3)
Co-authored-by: Gregory P. Smith greg@krypto.org [Google LLC]
https://bugs.python.org/issue35214