collapseos/blk/398

: IF ( -- a | a: br cell addr )
    COMPILE (?br) H@ 2 ALLOT ( br cell allot )
; IMMEDIATE
: THEN ( a -- | a: br cell addr )
    DUP H@ -^ _bchk SWAP ( a-H a ) !
; IMMEDIATE
: ELSE ( a1 -- a2 | a1: IF cell a2: ELSE cell )
    COMPILE (br)
    2 ALLOT
    [COMPILE] THEN
    H@ 2- ( push a. -2 for allot offset )
; IMMEDIATE