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Proof step 16 from proof prepost-decode-orphans (previous step)

⊦ ⟪decode_nat#(n1, buf; n, n0; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded(n, subarray(buf, n1, n0)) ∧ n1 + n0 ≤ # buf ∧ n0 = encoding-size(n)))

A spec-lemma