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Proof step 5 from proof decode-contract (previous step)

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