15. x:Id. vartype(i;x) r ds(x)?Top
16. e:E. loc(e) = i Id (valtype(e) r ma-valtype(da; kind(e)))
17. j : Id
18. t : 19. isnull(a(j;t))
20. j = i 21. kind(<j,t>) = k Knd
22. isnull(a(j;t))
(x after <j,t>) = f((z.(z when <j,t>)),val(<j,t>)) ds(x)?Top
15. x:Id. vartype(i;x) r ds(x)?Top
16. e:E. loc(e) = i Id (valtype(e) r ma-valtype(da; kind(e)))
17. j : Id
18. t : 19. isnull(a(j;t))
20. j = i 21. kind(<j,t>) = k Knd
22. isnull(a(j;t))
(x after <j,t>) = f((z.(z when <j,t>)),val(<j,t>)) ds(x)?Top
20 steps
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