(+) stack
    (*) TODO: some kills
(^) new impl. with explicit stack
(^) tceu_trail [evt,lbl,stk]
(^) clean HALT
(^) clean HALT / DEBUG_TRAILS
(^) linked orgs
(^) tceu_trail
(^) before expanding ceu_trails_set
(^) 0 => CEU_MAX_STACK
(-) ceu_trails_set / _get
(^) orgs
(^) ceu_lst => ceu_cur
(^) mem.lua events
(-) bug AwaitInt
(-) bug CLEAR blk
(-) bug EmitInt _CEU_CALL_
(-) bug pause / AwaitInt
(^) _ceu_evt_.org only if CEU_INTS
(^) _ceu_evt_.org only if CEU_INTS
(^) clr / fins
(^) minor adjustments
(^) fins
(+) tceu_org
(^) tceu_trail => tceu_trl