#17323: The "[X refs, Y blocks]" printed by debug builds has been disabled by default.  It can be re-enabled with the `-X showrefcount` option.
Issue #17516: use comment syntax for comments, instead of multiline string
Issue #17516: do not create useless tuple: remove dummy commas in tests
Issue #17516: remove dead code
Add versionadded for `-X faulthandler` (also fix typo and markup).
Merge versionadded addition and typo fix from 3.3.
fix variable reference to fix --enable-profiling (closes #17550)
move to correct section
merge 3.3 (#17550)
NEWS: add new header for Python 3.3.2
null merge from 3.3
Issue #16475: Add a whatsnew entry for 3.4
Issue 17538: Document XML vulnerabilties
Issue 17538: Document XML vulnerabilties
Issue 17538: Document XML vulnerabilties