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At:
sends-rule211 1. i : Id
2. k : Knd
3. l : IdLnk
4. ds : x:Id fp-> Type
5. da : a:Knd fp-> Type
6. f : (tg:IdState(ds)ma-valtype(da; k)(da(rcv(l; tg))?Void List)) List
7. source(l) = i 8. w : World
9. 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. a:Action(i). isnull(a) (valtype(i;a) r da(kind(a))?Top)
13. x:Id.
13. vartype(i;x) r if deq-member(IdDeq;x;1of(ds)) 2of(ds)(x) else Top fi
x:Id. vartype(i;x) r ds(x)?Top