title: Org-mode fails to export when passing arguments to code blocks that exports results
body: <p>When <a href="http://orgmode.org/manual/var.html#var" rel="nofollow">passing arguments to code block</a> that exports results Org-mode fails to export with the error "Wrong type argument: listp". How can I fix this?</p>
  
  <p>Here is an example. When it is exported it gives the error 'Wrong type argument: listp, "bar"'.</p>
  
  <pre><code>#+TITLE: Example
  
  #+SOURCE: example-one
  #+BEGIN_SRC emacs-lisp :exports results
  (setq foo "bar")
  #+END_SRC
  
  #+SOURCE: example-two
  #+BEGIN_SRC emacs-lisp :exports results :var x=example-one
  (setq foo (concat x x))
  #+END_SRC
  </code></pre>
  
  <p>I am running Org-mode 7.6 in Emacs 23.3.1.</p>