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Proof step 29 from proof refine-write (previous step)

LEB_SIZE = (n4 + n) + m1, avols[default-volid][m2] = mapped(buf0, n2), n ≠ 0, m2 < # avols[default-volid], ebm-cons(avols), ebm-vol-inv(abs(avols[default-volid])), is-aligned(n, EB_PAGE_SIZE), is-aligned(m1, EB_PAGE_SIZE), default-volid ∈ avols, n + m1 ≤ LEB_SIZE, n2 ≤ m1, m1 ≤ LEB_SIZE, n2 ≤ LEB_SIZE, n3 + n ≤ # buf, m1 + n ≤ LEB_SIZE ⊦ ⟨err := ESUCCESS; avol := abs(avols[default-volid]); if err = ESUCCESS then if n ≠ 0 then avol[m2] := mapped(avol[m2].data + mkempbuf(m1 - # avol[m2].data) + subarray(buf, n3, n)) else {n1 := n3; n2 := n; m0 := m2; m := m1; choose n with n < n2 ∧ is-aligned(n, EB_PAGE_SIZE) in if n ≠ 0 then avol[m0] := mapped(avol[m0].data + mkempbuf(m - # avol[m0].data) + subarray(buf, n1, n)) ifnone skip}⟩ ( avol = abs(avols[default-volid][m2, mapped(subarray(avols[default-volid][m2].data, 0, m1) + subarray(buf, n3, n) + mkempbuf(n4), m1 + n)]) ∧ ESUCCESS = err)

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Rule argument

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