>perl -MO=Terse script.pl --log
LISTOP (0x1df2644) leave [1]
    OP (0x1df23b0) enter
    COP (0x1df266c) nextstate
    LISTOP (0x1df26c8) leave
        OP (0x1df26a8) enter
        COP (0x1df26f0) nextstate
        UNOP (0x1df272c) null
            LOGOP (0x1df2750) cond_expr
                UNOP (0x1df3e78) defined
                    UNOP (0x1dfb770) null [15]
                        PADOP (0x1ba2fd4) gvsv  1
                LISTOP (0x1dfb1e4) leave
                    OP (0x1df2778) enter
                    COP (0x1dfb20c) nextstate
                    UNOP (0x1dfb248) null
                        LOGOP (0x1dfb26c) or
                            LISTOP (0x1dfb6f0) open [4]
                                OP (0x1dfb6d0) null [3]
                                PADOP (0x1dfb534) gv  3
                                SVOP (0x1dfb718) const  SPECIAL #0 Nullsv
                                UNOP (0x1dfb670) null [15]
                                    PADOP (0x1dfb694) gvsv  2
                            LISTOP (0x1dfb424) die [9]
                                OP (0x1dfb294) pushmark
                                UNOP (0x1dfb478) null [67]
                                    OP (0x1dfb458) null [3]
                                    BINOP (0x1dfb4a0) concat [7]
                                        BINOP (0x1dfb2b4) concat [6]
                                            SVOP (0x1dfb400) const  SPECIAL #0 Nullsv
                                            UNOP (0x1dfb300) null [15]
                                                PADOP (0x1dfb3dc) gvsv  5
                                        SVOP (0x1dfb2dc) const  SPECIAL #0 Nullsv
                LISTOP (0x1df27b8) leave
                    OP (0x1df2798) enter
                    COP (0x1df27e0) nextstate
                    UNOP (0x1df281c) null
                        LOGOP (0x1df2840) or
                            LISTOP (0x1df2a6c) open [11]
                                OP (0x1dfb164) null [3]
                                PADOP (0x1df2a48) gv  10
                                SVOP (0x1dfb188) const  SPECIAL #0 Nullsv
                            LISTOP (0x1df2970) die [16]
                                OP (0x1df2868) pushmark
                                UNOP (0x1df29c0) null [67]
                                    OP (0x1df29a0) null [3]
                                    BINOP (0x1df29e8) concat [14]
                                        BINOP (0x1df2888) concat [13]
                                            SVOP (0x1dfb1c0) const  SPECIAL #0 Nullsv
                                            UNOP (0x1df2928) null [15]
                                                PADOP (0x1df294c) gvsv  12
                                        SVOP (0x1dfb4fc) const  SPECIAL #0 Nullsv
    COP (0x1df23d0) nextstate
    LISTOP (0x1df2570) print
        OP (0x1df2550) pushmark
        UNOP (0x1df240c) rv2gv
            PADOP (0x1df2620) gv  21
        SVOP (0x1df25dc) const  SPECIAL #0 Nullsv
        UNOP (0x1df2598) scalar
            OP (0x1df25bc) localtime [17]
        UNOP (0x1df24b8) null [67]
            OP (0x1df2498) null [3]
            BINOP (0x1df24e0) concat [19]
                SVOP (0x1df2508) const  SPECIAL #0 Nullsv
                UNOP (0x1df2430) null [15]
                    PADOP (0x1df2454) gvsv  18
script.pl syntax OK