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Proof step 35 from proof soundness (previous step)

〈x1 := x〉〈build_rec#(0; x, to)〉 (to ≠ fail → x1 = depths(to .t, 0) + x), x2 = x ⊦ 〈build_rec#(0; x, to)〉〈to0 := to, x0 := x ; if x0 ≠ [] then to0 := fail〉 (to0 ≠ fail → x2 = depths(to0 .t, 0))

Heuristic symbolic execution applied rule assign left

And obtained the following new goals

Proof step 34:
〈build_rec#(0; x, to)〉 (to ≠ fail → x0 = depths(to .t, 0) + x), x2 = x, x0 = x ⊦ 〈build_rec#(0; x, to)〉〈to0 := to, x0 := x ; if x0 ≠ [] then to0 := fail〉 (to0 ≠ fail → x2 = depths(to0 .t, 0))

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]