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Proof step 6 from proof soundness (previous step)

x = [], x2 = x ∧ d0 = 0 ⊦ 〈to1 := fail, x1 := x2〉〈if x1 ≠ [] then to1 := fail〉 to1 = fail

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Proof step 5:
x = [], x2 = x ∧ d0 = 0, to = fail ∧ x0 = x2 ⊦ 〈if x0 ≠ [] then to := fail〉 to = fail

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]