symfony/symfony — pull request #3576 by vicb (2012-03-12 15:19:39+00:00)
Title: [RFC][Form] Alternate syntax for form_theme

before
`{% form_theme form _self "::base.html.twig" %}`

after
`{% form_theme form with [_self, "::base.html.twig"] %}`

_the former syntax is still supported_