form_tag with action parameter explicitly inside hash does not work

I tested it with rails 4 and ruby 2.0.0-rc2. Please see the screenshot of the exception i am getting.

<a href='http://postimg.org/image/4heyn6d55/' target='_blank'><img src='http://s28.postimg.org/4heyn6d55/syntax_error.jpg' border='0' alt="syntax error" /></a>

The form_tag description is given here
http://api.rubyonrails.org/classes/ActionView/Helpers/FormTagHelper.html#method-i-form_tag