When editing a tag the following debugging message appears:
Did you remember to call setType() for 'rawname'? Defaulting to PARAM_RAW cleaning.
line 1303 of /lib/formslib.php: call to debugging()
line 281 of /lib/formslib.php: call to moodleform->detectMissingSetType()
line 202 of /lib/formslib.php: call to moodleform->_process_submission()
line 83 of /tag/edit.php: call to moodleform->moodleform()

Steps to reproduce:
*Add the tags block to a course and add a tag
*Click on the tag to get to /tag/index.php?tag=yourtag
*Click to edit the tag. You can edit it but the above message appears.

Tested on QA Moodle and local host Moodle Moodle 2.6dev (Build: 20130530)