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Proof step 19 from proof encode-contract (previous step)

# buf1 = # buf, subarray(buf1, n + ENCODED_ELEM_SIZE, # buf - n + ENCODED_ELEM_SIZE) = subarray(buf, n + ENCODED_ELEM_SIZE, # buf - n + ENCODED_ELEM_SIZE), subarray(buf1, 0, n) = subarray(buf, 0, n), n + ENCODED_ELEM_SIZE ≤ # buf, err = ESUCCESS → is-encoded(a, subarray(buf1, n, ENCODED_ELEM_SIZE)) ∧ m = ENCODED_ELEM_SIZE, err = ESUCCESS ∨ ⌊err⌋ ⊦ ⟪skip⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded-nonempty(a, subarray(buf1, n, ENCODED_ELEM_SIZE)))), err = ESUCCESS ∧ isempty(buf1, n, m)

Heuristic symbolic execution applied rule skip right

And obtained the following new goals

Proof step 20:
# buf1 = # buf, subarray(buf1, 0, n) = subarray(buf, 0, n), subarray(buf1, n + ENCODED_ELEM_SIZE, # buf - n + ENCODED_ELEM_SIZE) = subarray(buf, n + ENCODED_ELEM_SIZE, # buf - n + ENCODED_ELEM_SIZE), n + ENCODED_ELEM_SIZE ≤ # buf, err = ESUCCESS → is-encoded(a, subarray(buf1, n, ENCODED_ELEM_SIZE)) ∧ m = ENCODED_ELEM_SIZE, err = ESUCCESS ∨ ⌊err⌋ ⊦ err = ESUCCESS ∧ isempty(buf1, n, m), (err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded-nonempty(a, subarray(buf1, n, ENCODED_ELEM_SIZE)))

Proof step 19 from proof encode-contract (previous step)

Heuristic symbolic execution applied rule skip right

And obtained the following new goals

Rule argument

Additional information