XML not rendered after upgrade to 2.0.2

I've upgrades from Rails 1.2.6 to 2.0.2 (it's about time) and am
getting render problems on the .xml files.
What I get is the XML layout with the HTML contents:

  <status err_code="0">logged in</status>
  <div class="content">Login: logged in: 1</div> <<-- this is
the problem (comes from .rhtml)

The layout is:
xml.instruct! :xml, :version=>"1.0", :encoding=>"UTF-8"
xml.info do
  xml.status(@status, :err_code=>@err_code || 0)
  res = @content_for_layout
  if res
    xml << @content_for_layout

And, in the controller, I have:
respond_to do |format|
  format.html do

The contents of the .rxml file just doesn't go out. What comes out as
@content_for_layout is what's in the .rhtml file. I'm calling /

What's changed?


Sorry, just checked again. My render was fine in Rails 1.99.1 too.
It's broken moving from that to 2.0.2.


From the upgrade guide, I assumed that template rename is optional.
The .rhtml files were OK, but the .rxml files are not found.

After renaming all .rxml to .xml.builder it works again.