Using a symbol whose function cell is an array
as argument to ASET works interpretively, but
not compiled.
(DEFUN ARRAY-BUG ()
(ARRAY AN-ARRAY T 1)
(ASET 'ARRAY-ELEMENT 'AN-ARRAY 0)
(PRINT (AREF 'AN-ARRAY 0)))
The compiled version complains about a wrong
type arg.