py3: fix for Python 3.12 emitting SyntaxWarning on invalid escape sequences Mercurial became very noisy after https://github.com/python/cpython/commit/a60ddd31be7ff96a8189e7483bf1eb2071d2bddf , for example: $ python3.12 mercurial/store.py mercurial/store.py:406: SyntaxWarning: invalid escape sequence '\.' EXCLUDED = re.compile(b'.*undo\.[^/]+\.(nd?|i)$') This verbosity made some tests fail. The problems were mostly insufficiently escaped regexps, relying on the Python parser/scanner preserving invalid escape sequences.

--- a/tests/test-help.t	Tue Mar 07 16:25:51 2023 +0100
+++ b/tests/test-help.t	Tue Mar 07 16:45:54 2023 +0100
@@ -1988,7 +1988,7 @@
 
   $ "$PYTHON" <<EOF
   > def escape(s):
-  >     return b''.join(b'\\u%x' % ord(uc) for uc in s.decode('cp932'))
+  >     return b''.join(br'\\u%x' % ord(uc) for uc in s.decode('cp932'))
   > # translation of "record" in ja_JP.cp932
   > upper = b"\x8bL\x98^"
   > # str.lower()-ed section name should be treated as different one