This documentation block is at the top of the 6.x version of includes/ajax.inc:
* @file ajax.inc
* Handles the server side AJAX interactions of Views.
* @defgroup ajax Views ajax library
This is not right. The @file should be one docblock, and the @defgroup should be a different doc block.
It's currently causing our d7 api.d.o test site to crash in parsing (which is a separate issue:
But it would be nice to get this fixed... maybe there was a separate issue to fix it already that wasn't backported to d6 because the d7 version does not have this problem (copy the header from the d7 ajax.inc and you'll be fine).