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Proof step 11 from proof decode-contract (previous step)

err = ESUCCESS, n0 = align↑(n1, ENCODED_ELEM_ALIGNMENT), err = ESUCCESS → is-encoded(a, subarray(buf, n, encoding-size(a))) ∧ n + encoding-size(a) ≤ # buf ∧ n1 = encoding-size(a), err = ESUCCESS ∨ ⌊err⌋ ⊦ ⟪err := EINVAL⟫ ( (err = ESUCCESS ∨ ⌊err⌋ ) ∧ ( err = ESUCCESS → is-encoded-aligned(a, subarray(buf, n, size-aligned(a, ENCODED_ELEM_ALIGNMENT))) ∧ n + size-aligned(a, ENCODED_ELEM_ALIGNMENT) ≤ # buf ∧ n0 = size-aligned(a, ENCODED_ELEM_ALIGNMENT))), n + n0 ≤ # buf

Heuristic symbolic execution applied rule assign right

And closed the goal!

Rule argument

Additional information

Used simplifier rules: ⊦ m ≤ n ↔ ¬ n < m; (ss)% ⊦ ESUCCESS ≠ EINVAL; (s)% ⊦ ⌊EINVAL⌋ ; (s)