o<extend_m8> sub
o2 if [#<_task> EQ 1]
 o1 if [EXISTS [#<P>]]
  (DEBUG,M8 P-word passed: #<P>)
 o1 else
  (DEBUG,M8 No P-word passed)
 o1 endif
 m8 (call built-in m8)
 (DEBUG, extend_m8 done)
o2 endif
o<extend_m8> endsub
m2
