subversion fails to build with Python 3.13.0a1.

Excerpt from the failed test run - it's not visible immediately where the problem is:

+ make check CLEANUP=yes
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/svntest/wc.py:96: SyntaxWarning: invalid escape sequence '\d'
  '((?P<wc_rev>\d+|-|\?) +(\d|-|\?)+ +(\S+) +)?'
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/svntest/wc.py:100: SyntaxWarning: invalid escape sequence '\>'
  '(  \> moved (from (?P<moved_from>.+)|to (?P<moved_to>.*)))'
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/svntest/wc.py:101: SyntaxWarning: invalid escape sequence '\>'
  '|(  \> swapped places with (?P<swapped_with>.+).*)'
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/svntest/wc.py:102: SyntaxWarning: invalid escape sequence '\>'
  '|(\>   (?P<tc>.+))'
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/svntest/wc.py:111: SyntaxWarning: invalid escape sequence '\s'
  '([CAUD ])\s+'
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/svntest/wc.py:114: SyntaxWarning: invalid escape sequence '\s'
  '\s+\'(.+)\'(( --|: ).*)?')
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/svntest/wc.py:115: SyntaxWarning: invalid escape sequence '\s'
  _re_parse_co_restored = re.compile('^(Restored)\s+\'(.+)\'')
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/svntest/wc.py:119: SyntaxWarning: invalid escape sequence '\w'
  _re_parse_commit = re.compile('^(\w+(  \(bin\))?)\s+(.+)')
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/svntest/verify.py:1026: SyntaxWarning: invalid escape sequence '\ '
  """Return a property diff for modification of property PNAME, old value
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/svntest/main.py:1470: SyntaxWarning: invalid escape sequence '\('
  from_foreign_phrase = foreign and "\(from foreign repository\) " or ""
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/svntest/actions.py:1048: SyntaxWarning: invalid escape sequence '\('
  if re.search(' \(\d+ lines?\)$', key):
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/svntest/actions.py:1050: SyntaxWarning: invalid escape sequence '\('
  match = re.match('^(.*) \((\d+) lines?\)$', key)
[001/122] auth-test......................................................success
[002/122] authz-test.....................................................success
[003/122] bit-array-test.................................................success
[004/122] cache-test.....................................................success
[005/122] checksum-test..................................................success
[006/122] client-test....................................................success
[007/122] compat-test....................................................success
[008/122] compress-test..................................................success
[009/122] config-test....................................................success
[010/122] conflict-data-test.............................................success
[011/122] conflicts-test.................................................success
[012/122] crypto-test....................................................success
[013/122] db-test........................................................success
[014/122] diff-diff3-test................................................success
[015/122] dirent_uri-test................................................success
[016/122] dump-load-test.................................................success
[017/122] entries-compat-test............................................success
[018/122] error-code-test................................................success
[019/122] error-test.....................................................success
[020/122] filesize-test..................................................success
[021/122] fs-fs-pack-test................................................success
[022/122] fs-fs-private-test.............................................success
[023/122] fs-sequential-test.............................................success
[024/122] fs-test........................................................success
[025/122] fs-x-pack-test.................................................success
[026/122] hashdump-test..................................................success
[027/122] io-test........................................................success
[028/122] locks-test.....................................................success
[029/122] mergeinfo-test.................................................success
[030/122] mtcc-test......................................................success
[031/122] op-depth-test..................................................success
[032/122] opt-test.......................................................success
[033/122] packed-data-test...............................................success
[034/122] parse-diff-test................................................success
[035/122] path-test......................................................success
[036/122] prefix-string-test.............................................success
[037/122] priority-queue-test............................................success
[038/122] pristine-store-test............................................success
[039/122] ra-local-test..................................................success
[040/122] ra-test........................................................success
[041/122] random-test....................................................success
[042/122] repos-test.....................................................success
[043/122] revision-test..................................................success
[044/122] root-pools-test................................................success
[045/122] skel-test......................................................success
[046/122] spillbuf-test..................................................success
[047/122] sqlite-test....................................................success
[048/122] stream-test....................................................success
[049/122] string-table-test..............................................success
[050/122] string-test....................................................success
[051/122] subst_translate-test...........................................success
[052/122] svndiff-stream-test............................................success
[053/122] time-test......................................................success
[054/122] translate-test.................................................success
[055/122] utf-test.......................................................success
[056/122] wc-queries-test................................................success
[057/122] wc-test........................................................success
[058/122] window-test....................................................success
[059/122] x509-test......................................................success
[060/122] xml-test.......................................................success
[061/122] authz_tests.py/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/upgrade_tests.py:54: SyntaxWarning: invalid escape sequence '\('
  wc_is_too_old_regex = (".*is too old \(format \d+.*\).*")
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/upgrade_tests.py:60: SyntaxWarning: invalid escape sequence '\d'
  return int(re.search("\n#define SVN_WC__VERSION (\d+)\n", format_file).group(1))
.................................................success
[062/122] autoprop_tests.py..............................................success
[063/122] basic_tests.py/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:699: SyntaxWarning: invalid escape sequence '\.'
  extra_files = ['mu.*\.r1', 'mu.*\.r2', 'mu.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:699: SyntaxWarning: invalid escape sequence '\.'
  extra_files = ['mu.*\.r1', 'mu.*\.r2', 'mu.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:699: SyntaxWarning: invalid escape sequence '\.'
  extra_files = ['mu.*\.r1', 'mu.*\.r2', 'mu.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:700: SyntaxWarning: invalid escape sequence '\.'
  'rho.*\.r1', 'rho.*\.r2', 'rho.*\.mine',]
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:700: SyntaxWarning: invalid escape sequence '\.'
  'rho.*\.r1', 'rho.*\.r2', 'rho.*\.mine',]
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:700: SyntaxWarning: invalid escape sequence '\.'
  'rho.*\.r1', 'rho.*\.r2', 'rho.*\.mine',]
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2261: SyntaxWarning: invalid escape sequence '\.'
  extra_files = ['mu.*\.r1', 'mu.*\.r2', 'mu.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2261: SyntaxWarning: invalid escape sequence '\.'
  extra_files = ['mu.*\.r1', 'mu.*\.r2', 'mu.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2261: SyntaxWarning: invalid escape sequence '\.'
  extra_files = ['mu.*\.r1', 'mu.*\.r2', 'mu.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2262: SyntaxWarning: invalid escape sequence '\.'
  'lambda.*\.r1', 'lambda.*\.r2', 'lambda.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2262: SyntaxWarning: invalid escape sequence '\.'
  'lambda.*\.r1', 'lambda.*\.r2', 'lambda.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2262: SyntaxWarning: invalid escape sequence '\.'
  'lambda.*\.r1', 'lambda.*\.r2', 'lambda.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2263: SyntaxWarning: invalid escape sequence '\.'
  'omega.*\.r1', 'omega.*\.r2', 'omega.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2263: SyntaxWarning: invalid escape sequence '\.'
  'omega.*\.r1', 'omega.*\.r2', 'omega.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2263: SyntaxWarning: invalid escape sequence '\.'
  'omega.*\.r1', 'omega.*\.r2', 'omega.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2264: SyntaxWarning: invalid escape sequence '\.'
  'rho.*\.r1', 'rho.*\.r2', 'rho.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2264: SyntaxWarning: invalid escape sequence '\.'
  'rho.*\.r1', 'rho.*\.r2', 'rho.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2264: SyntaxWarning: invalid escape sequence '\.'
  'rho.*\.r1', 'rho.*\.r2', 'rho.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2265: SyntaxWarning: invalid escape sequence '\.'
  'tau.*\.r1', 'tau.*\.r2', 'tau.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2265: SyntaxWarning: invalid escape sequence '\.'
  'tau.*\.r1', 'tau.*\.r2', 'tau.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2265: SyntaxWarning: invalid escape sequence '\.'
  'tau.*\.r1', 'tau.*\.r2', 'tau.*\.mine',
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2341: SyntaxWarning: invalid escape sequence '\.'
  extra_files = ['omega.*\.r1', 'omega.*\.r2', 'omega.*\.mine',]
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2341: SyntaxWarning: invalid escape sequence '\.'
  extra_files = ['omega.*\.r1', 'omega.*\.r2', 'omega.*\.mine',]
/builddir/build/BUILD/subversion-1.14.2/subversion/tests/cmdline/basic_tests.py:2341: SyntaxWarning: invalid escape sequence '\.'
  extra_files = ['omega.*\.r1', 'omega.*\.r2', 'omega.*\.mine',]
...........................................make: *** [Makefile:549: check] Error 1
+ : Test suite failure.
+ cat fails.log
cat: fails.log: No such file or directory

https://docs.python.org/3.13/whatsnew/3.13.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.13/fedora-rawhide-x86_64/06546840-subversion/

For all our attempts to build subversion with Python 3.13, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.13/package/subversion/

Testing and mass rebuild of packages is happening in copr.
You can follow these instructions to test locally in mock if your package builds with Python 3.13:
https://copr.fedorainfracloud.org/coprs/g/python/python3.13/

Let us know here if you have any questions.

Python 3.13 is planned to be included in Fedora 41.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.13.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires),
so if this package is required a lot, it's important for us to get it fixed soon.

We'd appreciate help from the people who know this package best,
but if you don't want to work on this now, let us know so we can try to work around it on our side.