In a freshly-built XEmacs 21.4.3 with lots-o-packages installed,
ruby-mode isn't highlighting keywords.  Indenting is working
correctly, and comments and strings are being colorized, although
whenever '#{' (sans quotes) is typed, the following spews forth into
the *Warnings* buffer:




(37) (warning/warning) Error caught in `font-lock-pre-idle-hook':
(invalid-function 1)