Files
RustPython/Lib/test
Luan Taraschi 79cf1d9dd0 Drop the narrow-build surrogate pairing from unicode_escape (#8569)
unicodeescape_string is a port of CPython 2.7's
PyUnicode_EncodeUnicodeEscape, where the branch mapping a character at or
above 0x10000 to \U00xxxxxx sits under #ifdef Py_UNICODE_WIDE and the
branch folding a surrogate pair sits under the #else. The port kept the
"# ifdef Py_UNICODE_WIDE" and "# endif" comments around the first one but
dropped the #else, so both branches run.

The pairing branch reads the next character without checking that there
is one, so a high surrogate at the end of the string walks off it:

    >>> "\ud800".encode("unicode_escape")
    IndexError: index out of range      # CPython: b'\ud800'

And when there is a next character it folds the two, which no wide build
does:

    >>> "𐀀".encode("unicode_escape")
    b'\U00010000'                      # CPython: b'\ud800\udc00'

With the branch gone a high surrogate falls through to the 16-bit case
and comes out as \udXXX, which is where a low surrogate already went.

test_incremental_surrogatepass in UnicodeEscapeTest carried an
expectedFailure for the IndexError. It passes now, so the override goes
with it.

Assisted-by: Claude Code:claude-opus-5
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