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Proof step 16 from proof soundness (previous step)

x = d ' + y, d < 0, max(d ' + y) < 0, d ≤ max(d ' + y), x2 = x ∧ d1 = 0, h0 = head(x2) ⊦ 〈to1 := fail, x1 := x2〉〈if x1 ≠ [] then to1 := fail〉 (to1 ≠ fail → d ' + y = depths(to1 .t, 0))

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Proof step 15:
x = d ' + y, d < 0, max(d ' + y) < 0, d ≤ max(d ' + y), x2 = x ∧ d1 = 0, h0 = head(x2), to = fail ∧ x0 = x2 ⊦ 〈if x0 ≠ [] then to := fail〉 (to ≠ fail → d ' + y = depths(to .t, 0))

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]