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Proof step 9 from proof harness-1 (previous step)

to3 = fail, x0 = 2 ', x1 = x0 ∧ d0 = 2, h0 = head(x1), to = some(Node(Leaf, some(Node(Node(Leaf, Leaf), some(Leaf) .t)) .t)) ⊦ 〈skip〉 to = some(Node(Leaf, Node(Node(Leaf, Leaf), Leaf)))

Heuristic symbolic execution applied rule skip right

And closed the goal!

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ some(t) .t = t], [CSIMPSEQ : ⊦ some(t) = some(t0) ↔ t = t0])]]