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  1. or download this
    sub DEBUG {0}
    print "blabla" if DEBUG;
    
  2. or download this
    C:\>perl -MO=Deparse -e "print 'this' if $x"
    print 'this' if $x;
    -e syntax OK
    C:\>perl -MO=Deparse -e "print 'this' if 0"
    '???';
    -e syntax OK
    
  3. or download this
    C:\>perl -MO=Deparse -we "sub DEBUG{0}print 'this' if DEBUG;"
    sub DEBUG {
        0;
    ...
    }
    '???';
    -e syntax OK