Hi,

I think I hit on a bug in GNU Emacs 24.0.94.1 (x86_64-unknown-linux-gnu,
GTK+ Version 2.24.10) of 2012-03-11.  This cl loop is not parsed
correctly.

(loop for rms in nil
      when t
      do (loop for (gnu . emacs) in nil)
      end)

Backtrace when evaling this form: