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Proof step 14 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), to = fail ∧ x0 = x2 ⊦ 〈to := fail〉 (to ≠ fail → d ' + y = depths(to .t, 0))

Heuristic symbolic execution applied rule assign right

And closed the goal!

Rule argument

[emptyarg]

Additional information

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