>perl -MO=Debug -e "print qq{Hello, world!\n};"
LISTOP (0x1bb2ec0)
        op_next         0x0
        op_sibling      0x0
        op_ppaddr       PL_ppaddr[OP_LEAVE]
        op_targ         1
        op_type         178
        op_seq          6612
        op_flags        13
        op_private      64
        op_first        0x1ab8b84
        op_last         0x1bb2f84
        op_children     3
OP (0x1ab8b84)
        op_next         0x1bb2f08
        op_sibling      0x1bb2f08
        op_ppaddr       PL_ppaddr[OP_ENTER]
        op_targ         0
        op_type         177
        op_seq          6607
        op_flags        0
        op_private      0
COP (0x1bb2f08)
        op_next         0x1bb2f5c
        op_sibling      0x1bb2f84
        op_ppaddr       PL_ppaddr[OP_NEXTSTATE]
        op_targ         0
        op_type         174
        op_seq          6608
        op_flags        1
        op_private      0
        cop_label
        cop_stashpv     main
        cop_file        -e
        cop_seq         6608
        cop_arybase     0
        cop_line        1
        cop_warnings    0x0
.
.
.