Symfony2, How to make a form label class/attr different than its input?

Question

I would like to build a form with label and inputs, but the class of them should be different. Code below creates the label for the input with same attr:

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Answer 1

The above is no longer correct, at least in the context I was using it. In Symfony 2.1 the solution is:

{{ form_label(form.item, label|default(null), { 'label_attr': { 'class': 'MYCLASS' } }) }}