Bug in delete-char ???? (Emacs 21.2.2)

[Greg Hill]

When delete-char attempts to delete backwards from the beginning of 
the buffer, or forwards from the end of the buffer, it is aborting 
the function being executed (as it should, of course), but it 
_does_not_cause_the_debugger_to_be_entered_.

Example:
(progn
  (setq debug-on-error t)
  (goto-char 1)
  (delete-char -1)
  (message "Got past error"))

Behavior:
Prints "Beginning of buffer" in the echo area, does not print "Got 
past error" (correct behavior), but does NOT enter debugger.


Example:
(progn
  (setq debug-on-error t)
  (goto-char (point-max))
  (delete-char 1)
  (message "Got past error"))

Behavior:
Prints "End of buffer" in the echo area, does not print "Got past 
error" (correct behavior), but does NOT enter debugger.

--Greg