: IF ( -- a | a: br cell addr )
    0x3f ( ?br ) , H@ 1 ALLOT ( br cell allot )
; IMMEDIATE
: THEN ( a -- | a: br cell addr )
    DUP H@ -^ _bchk SWAP ( a-H a ) C!
; IMMEDIATE
: ELSE ( a1 -- a2 | a1: IF cell a2: ELSE cell )
    0x3b ( br ) ,
    1 ALLOT
    [COMPILE] THEN
    H@ 1- ( push a. 1- for allot offset )
; IMMEDIATE