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

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

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Proof step 5:
# xs = xs_len, xs_len + 1 = h, # xs < h, # ys = 0 ∨ # ys = h ⊦ ⟪xs_len := 0; xs0 := []⟫ (# xs0 < h ∧ # xs0 = xs_len ∧ (#(a + xs) = 0 ∨ #(a + xs) = h))

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

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Rule argument

Additional information