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Proof step 4 from proof inv-init (previous step)

⊦ ⟪h := n, xs := [], xs_len := 0, ys := []⟫ (# xs < h ∧ # xs = xs_len ∧ (ys = [] ∨ # ys = h)), n = 0

Heuristic symbolic execution applied rule assign right

And closed the goal!

Rule argument

Additional information

Used simplifier rules: ⊦ # [] = 0; (s)% ⊦ 0 < m ↔ m ≠ 0; (s)