lblexec BSET ( DI -> wordref )
    AL [DI] MOVr[], DI INCx, ( PFA )
    AL AL ORrr, IFZ, DI JMPr, THEN, ( native )
    AL DECr, IFNZ, ( cell or does )
        DI PUSHx, ( push PFA )
        AL DECr, IFZ, ( cell ) JMPs, lblnext @ RPCs, THEN,
        ( does, see B302 )
        DI INCx, DI INCx, DI [DI] MOVx[],
    THEN, ( continue to compiled )
    ( compiled )
    BP INCx, BP INCx, [BP] 0 DX MOV[]+x, ( pushRS )
    DX DI MOVxx, DX INCx, DX INCx, ( --> IP )
    DI [DI] MOVx[],
    JMPs, lblexec @ RPCs,