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Proof step 58 from proof refine-write-data-wl (previous step)

⊦ m0 < # buf → copy(buf0, n, buf, n0, m)[m0] = (m0 < n0 ∨ n0 + m ≤ m0 ⊃ buf[m0];buf0[m0 + n - n0])

A spec-lemma