perl -d -MO=Terse
-e 'print;exit'

Loading DB routines from perl5db.pl version 1.28 Editor support
available.

Enter h or `h h' for help, or `man perldebug' for more help.

LISTOP (0x8133268) leave [1]
    OP (0x8126700) enter
    COP (0x81265f0) dbstate
    LISTOP (0x82db488) print
        OP (0x82db2d8) pushmark
        UNOP (0x82db468) null [15]
            SVOP (0x82db350) gvsv GV (0x811e120) *_
    COP (0x81334b0) dbstate
    OP (0x8134a98) exit