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Proof step 1 from proof decode-contract (conclusion)

⊦ ⟪decode_aligned#(n, buf, ENCODED_ELEM_ALIGNMENT; a, n0; err)⟫ ( (err = ESUCCESS ∨ ⌊err⌋ ) ∧ ( err = ESUCCESS → is-encoded-aligned(a, subarray(buf, n, size-aligned(a, ENCODED_ELEM_ALIGNMENT))) ∧ n + size-aligned(a, ENCODED_ELEM_ALIGNMENT) ≤ # buf ∧ n0 = size-aligned(a, ENCODED_ELEM_ALIGNMENT)))

Heuristic nonrecursive calls applied rule call right

And obtained the following new goals

Proof step 2:
⊦
Proof step 3:
m = ENCODED_ELEM_ALIGNMENT ⊦ ⟪decode#(n, buf; a, n0; err); if err = ESUCCESS then {n0 := align↑(n0, m); if ¬ n + n0 ≤ # buf then err := EINVAL}⟫ ( (err = ESUCCESS ∨ ⌊err⌋ ) ∧ ( err = ESUCCESS → is-encoded-aligned(a, subarray(buf, n, size-aligned(a, ENCODED_ELEM_ALIGNMENT))) ∧ n + size-aligned(a, ENCODED_ELEM_ALIGNMENT) ≤ # buf ∧ n0 = size-aligned(a, ENCODED_ELEM_ALIGNMENT)))

Rule argument

pos: right 1

Additional information

Used simplifier rules: decode: ⊦ ;