; ( n -- ) Exceptions ; R( -- ) ; throw an exception VE_THROW: .db $05, "throw" .dw VE_HEAD .set VE_HEAD = VE_THROW XT_THROW: .dw DO_COLON PFA_THROW: .dw XT_DUP .dw XT_EQUALZERO .dw XT_DOCONDBRANCH .dw PFA_THROW1 .dw XT_DROP .dw XT_EXIT PFA_THROW1: .dw XT_HANDLER .dw XT_FETCH .dw XT_RP_STORE .dw XT_R_FROM .dw XT_HANDLER .dw XT_STORE .dw XT_R_FROM .dw XT_SWAP .dw XT_TO_R .dw XT_SP_STORE .dw XT_DROP .dw XT_R_FROM .dw XT_EXIT