( L1 LBL! .. L1 ' RJMP LBL, )
: LBL! ( l -- ) PC SWAP ! ;
: LBL, ( l op -- ) SWAP @ 1- SWAP EXECUTE A,, ;
( L1 FLBL, .. L1 ' RJMP FLBL! )
: FLBL, ( l -- ) LBL! 0 A,, ;
: FLBL! ( l opw -- )
    ( warning: l is a PC offset, not a mem addr! )
    SWAP @ 2 * ORG @ + PC 1- H@ ( opw addr tgt hbkp )
    ROT HERE ! ( opw tgt hbkp ) SWAP ROT EXECUTE H@ ! ( hbkp )
    HERE ! ;