$ print upper (a, b, c, d, 1)
Breakpoint 2, upper (a=0x0, b=0x6e0000005b, c=0x0, d=0x0, len=48)....
$ print $bnd0
- {lbound = 0x0, ubound = ffffffff} : size -1
+ @{lbound = 0x0, ubound = ffffffff@} : size -1
@end smallexample
At this last step the value of bnd0 can be changed for investigation of bound