`cprint lenght of occurs-item` asks for subscript (and may reads data)
LINKAGE SECTION.
01 a.
03 b occurs 6.
05 c occurs 4.
07 c1 pic 9.
07 c2 pic x.
none of the following should request a subscript:
(gdb) cprint length of b
(gdb) cprint length of c
(gdb) cprint length of c1
and also it shouldn't try to read any data, the user just requested the length.