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Proof step 7 from proof inv-add (previous step)

# xs = xs_len, # xs < h, # ys = 0 ∨ # ys = h ⊦ ⟪xs := a + xs; xs_len := 1 + xs_len⟫ (# xs < h ∧ # xs = xs_len ∧ (# ys = 0 ∨ # ys = h)), xs_len + 1 = h

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Proof step 8:
# xs = xs_len, # xs < h, # ys = 0 ∨ # ys = h ⊦ ⟪xs_len := 1 + xs_len⟫ (#(a + xs) < h ∧ #(a + xs) = xs_len ∧ (# ys = 0 ∨ # ys = h)), xs_len + 1 = h

Proof step 7 from proof inv-add (previous step)

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Rule argument

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