Debugging calendar gremlin in emacs 22.0.50.1

[ken]

After working already dozens of times, "M-x diary" suddenly fails with
error message "Wrong type argument: sequencep, t".  The only changes
made were to add more entries in the diary file.  To see if this was the
cause of the problem, I trimmed the diary file to just one entry:

%%(diary-float 11 4 -1) <p>(American) Thanksgiving Day.</p>

but the behavior is the same.

Running "M-x load-file" on ..../diary-lib.el yeilds the same error.


How to figure this one out?


tia

-- 
One is not superior merely because one
sees the world as odious.
                -- Chateaubriand (1768-1848)