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Proof step 2 from proof inv-init (previous step)

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

Heuristic unfold applied rule call right

And obtained the following new goals

Proof step 3:
⊦ ⟪if n > 0 then h := n, xs := [], xs_len := 0, ys := [] else abort⟫ (# xs < h ∧ # xs = xs_len ∧ (ys = [] ∨ # ys = h)), n = 0

Rule argument

pos: right 1

Additional information

Used simplifier rules: init: ⊦ ;