API page: https://api.drupal.org/api/drupal/includes%21registry.inc/function/_regi...
Enter a descriptive title (above) relating to function _registry_parse_file, then describe the problem you have found:
The function _registry_parse_file(), and various functions up the tree of calling functions, document that they are listing both functions and classes.
However, the function listing was removed from the registry a long time back -- as you can see, this function is only looking for the words "class" and "interface", not "function".
The documentation was never updated, and it should be updated on this function, functions that call it, functions that call those functions, etc. I think there are about 10 or fewer functions that need to be updated this way -- you can trace them on api.drupal.org pretty easily, so I think this is probably a good Novice project.
