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Proof step 1 from proof decode-contract (conclusion)

EB_PAGE_SIZE ≤ # buf ⊦ ⟪decode_pagesize#(EB_PAGE_SIZE, buf; a; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded-pagesize(a, subarray(buf, 0, EB_PAGE_SIZE))))

Heuristic nonrecursive calls applied rule call right

And obtained the following new goals

Proof step 2:
⊦
Proof step 3:
n = EB_PAGE_SIZE, EB_PAGE_SIZE ≤ # buf ⊦ ⟪if ENCODED_ELEM_SIZE ≤ n then decode_nonempty#(0, buf; a; err) else err := EINVAL⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded-pagesize(a, subarray(buf, 0, EB_PAGE_SIZE))))

Rule argument

pos: right 1

Additional information

Used simplifier rules: decode: ⊦ ;