2. k : Knd
3. l : IdLnk
4. ds : x:Id fp-> Type
5. da : a:Knd fp-> Type
6. f : (tg:Id
State(ds)
ma-valtype(da; k)(da(rcv(l; tg))?Void List)) List
7. source(l) = i
8. es : ES
9. w : World
10. p : FairFifo
11. PossibleWorld(d-single-sends(i; ds; da; k; l; f);w)
12. es = ES(w)
13.
x:Id. vartype(i;x) 
r ds(x)?Top
14.
e:E. loc(e) = i 
(valtype(e) r ma-valtype(da; kind(e)))
15.
e:E. isrcv(e) lnk(e) = l (valtype(e) r ma-valtype(da; kind(e)))
16. {m:Msg| source(mlnk(m)) = i }
r Msg((
l,tg. da(rcv(l; tg))?Top))
17. e : E
18. loc(e) = i
19. kind(e) = k
20. x : t:Id
da(rcv(l; t))?Void
<l,x> 
Msg((l,tg. da(rcv(l; tg))?Top))
