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Proof step 18 from proof encode-contract (previous step)

# buf1 = # buf, # buf = n0 + n + ENCODED_ELEM_SIZE, subarray(buf1, 0, n) = subarray(buf, 0, n), subarray(buf1, n + ENCODED_ELEM_SIZE, n0) = subarray(buf, n + ENCODED_ELEM_SIZE, n0), is-encoded(a, subarray(buf1, n, ENCODED_ELEM_SIZE)), isempty(buf1, n, ENCODED_ELEM_SIZE), n + ENCODED_ELEM_SIZE ≤ # buf ⊦ ⟪err := EINVAL⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → subarray(buf1, n, ENCODED_ELEM_SIZE) ≠ mkempbuf(ENCODED_ELEM_SIZE)))

Heuristic symbolic execution applied rule assign right

And closed the goal!

Rule argument

Additional information

Used simplifier rules: ⊦ ESUCCESS ≠ EINVAL; (s)% ⊦ ⌊EINVAL⌋ ; (s)