>perl -MO=Terse script.pl
Useless use of a constant in void context at script.pl line 10.
Useless use of a constant in void context at script.pl line 20.
LISTOP (0x1df2e3c) leave [1]
    OP (0x1dfb290) enter
    COP (0x1df2e88) nextstate
    OP (0x1ba34e4) null [5]
    COP (0x1dfb2d4) nextstate
    OP (0x1dfb174) null [5]
script.pl syntax OK