Summary

Upgrade json module from CPython v3.14.3.

Part of #6839

Changes

• Updated Lib/json from CPython v3.14.3
• Migrated test files preserving RustPython markers
• Auto-marked 7 new test failures with @expectedFailure
• Fixed update_lib scripts to handle classes with pass on same line
• Fixed auto_mark to prevent empty classes after stripping markers

Script Fixes

This PR also includes two critical fixes to the update_lib scripts:

1. patch_spec.py: Expand one-line classes before inserting methods

   • When applying patches to classes like class Foo: pass, the script now properly expands them to class Foo: before inserting methods

2. cmd_auto_mark.py: Add pass to empty classes after stripping

   • When strip_reasonless_expected_failures removes super-call-only methods, it now checks if any classes become empty and adds pass statements to prevent syntax errors

AI generated by Upgrade Python Library

• expires on Feb 15, 2026, 7:31 PM UTC