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. w : World
9. p : FairFifo
10. FairFifo
11.
l@0:IdLnk, tg:Id.
11. (w.M(l@0,tg))
r if eqof(IdDeq)(source(l@0),i)
11. (w.M(l@0,tg))
r if <ds,da,,,,<[<k,l>],
x.f>,,,
>
11. (w.M(l@0,tg))
r else fi.da(rcv(l@0; tg))
12. (eqof(IdDeq)(i,i)) ~ true
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.
a:Action(i). 
isnull(a) (valtype(i;a) r da(kind(a))?Top)
18.
x:Id.
18. vartype(i;x)
r if deq-member(IdDeq;x;1of(ds)) 2of(ds)(x) else Top fi
19. IdDeq
EqDecider(Id)
20. j : Id
21. t :
22.
isnull(a(j;t))
23. True
24. j = i
25. kind(<j,t>) = k
26.
isnull(a(i;t))
27. (
x.s(i;t).x) State(ds)
28.
l@0:IdLnk.
28. (eqof(product-deq(Knd;IdLnk;KindDeq;IdLnkDeq))(<k,l>,<kind(a(i;t)),l@0>)
28. (
false)
28.
28. map(
ms.2of(ms);filter(ms.mlnk(ms) = l@0;m(i;t)))
28. =
28. if source(l@0) = i
tagged-list-messages(x.s(i;t).x;val(a(i;t));f)
28. else nil fi
29. withlnk(l;m(i;t)) = tagged-list-messages(
x.s(i;t).x;val(a(i;t));f)
30. source(l) = i
31. ({m:Msg(w.M)| source(mlnk(m)) = i } List)
r (Msg
31. ((
l,tg. da(rcv(l; tg))?Top)) List)
32. L : {x:Msg| mlnk(x) = l } List
33. filter(
ms.mlnk(ms) = l;m(i;t)) = L
34. x : {x:Msg| mlnk(x) = l }
<l,2of(x)> {x:Msg| mlnk(x) = l }
