perl -s script.pl -R=val args for program
     \/           \____/ \______________/
    perl            -s        script
    opts           opts        args


perl -s script.pl -R=val -- args for program
     \/           \____/    \______________/
    perl            -s           script
    opts           opts           args

perl -s -e'...' -- -R=val args for program
     \________/    \____/ \______________/
        perl         -s        script
        opts        opts        args


perl -s -e'...' -- -R=val -- args for program
     \________/    \____/    \______________/
        perl         -s           script
        opts        opts           args