The loop in parser.js assumed that there was always a heading before
any comments (not counting the page title, only section headings).
Bug: T243869
Change-Id: I3a0bb06716e75d4a17e25c40748673a071ee5f30
We removed it in c40c112514 when we added
a more practical use for the parser, but I keep wishing I had it to
experiment with the parser code.
Now it's off by default and can be used by adding &dtdebug=1 to the URL.
Change-Id: I6a92bfe7f55af0949b391606b04c3cfa0f996f2a