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Proof step 2 from proof decode-contract (previous step)

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

Heuristic nonrecursive calls applied rule call right

And obtained the following new goals

Proof step 3:
⊦
Proof step 4:
n + ENCODED_ELEM_SIZE ≤ # buf ⊦ ⟪if isempty(buf, n, ENCODED_ELEM_SIZE) then err := EINVAL else let m = ? in decode#(n, buf; a, m; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded-nonempty(a, subarray(buf, n, ENCODED_ELEM_SIZE))))

Rule argument

pos: right 1

Additional information

Used simplifier rules: decode: ⊦ ;