id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
15167	ModelFormSet changes the return type of ModelForm.non_field_errors()	Harm Geerts <hgeerts@…>	nobody	"The validate_unique check added in #9493 replaces the ErrorList with a string.
This breaks the expected behaviour[1] for non_field_errors on the form.

[1] http://code.djangoproject.com/browser/django/trunk/django/forms/forms.py#L237"		closed	Forms	dev		fixed		bronger@…	Ready for checkin	1	0	0	0	0	0