module ActionView::Helpers::FormHelper

def form_for_with_haml(object_name, *args, &proc)
  if block_given? && is_haml?
    oldproc = proc
    proc = proc {|*args| with_tabs(1) {oldproc.call(*args)}}
  end
  res = form_for_without_haml(object_name, *args, &proc)
  res << "\n" if block_given? && is_haml?
  res
end