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Proof step 13 from proof decode-contract (previous step)

n + ENCODED_ELEM_SIZE ≤ # buf ⊦ isempty(buf, n, ENCODED_ELEM_SIZE), ∀ a, m, err. is-encoded(a, subarray(buf, n, ENCODED_ELEM_SIZE)) ∧ m = ENCODED_ELEM_SIZE → err = ESUCCESS → subarray(buf, n, ENCODED_ELEM_SIZE) ≠ mkempbuf(ENCODED_ELEM_SIZE)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 14:
subarray(buf, n, ENCODED_ELEM_SIZE) = mkempbuf(ENCODED_ELEM_SIZE), is-encoded(a, subarray(buf, n, ENCODED_ELEM_SIZE)), n + ENCODED_ELEM_SIZE ≤ # buf ⊦ isempty(buf, n, ENCODED_ELEM_SIZE)

Rule argument

Additional information

Used simplifier rules: ⊦ # subarray(buf, m, n) = n; (s)%is-encoded-size: ⊦ is-encoded(a, buf) → # buf = ENCODED_ELEM_SIZE; (forward) from specification encoding-fixed-size