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Proof step 21 from proof refine-write-buf (previous step)

# buf1 = EB_PAGE_SIZE, # lpt0 = # avol1, # avol0 = # avol1, rofs0 ↔ rofs, avol0[m4] = mapped(buf2), adr = adr0, avol = avol0, bleb = buffered(m4), buf0 = buf, lpt = lpt0, m = m3, m0 = EB_PAGE_SIZE, n1 = align↓(wbuf.nbytes + n2, m0), n2 = n, ns = ns0, plog = plog0, ¬ rofs, wbuf = mkwbuf(buf1, m1, m2), m4 < # avol1, m2 < EB_PAGE_SIZE, abs(avol1, buffered(m4), mkwbuf(buf1, m1, m2), avol0, rofs), awbuf-inv(avol1, buffered(m4)), ebm-vol-inv(avol0), is-aligned(m1, EB_PAGE_SIZE), n ≤ # buf, # avol1[m4].data + n ≤ LEB_SIZE, wbuf.nbytes + n2 ≥ m0, rofs → m1 ≤ # buf2, ¬ rofs → # buf2 = m1, ¬ rofs → wbuf.offset + wbuf.nbytes + n2 ≤ LEB_SIZE ∧ n2 ≤ # buf0 ⊦ ⟪let n0 = n1 - wbuf.nbytes in let n = (wbuf.nbytes + n2) % m0 in let buf = mkbuf(n1) in {buf := copy(wbuf.content, 0, buf, 0, wbuf.nbytes); buf := copy(buf0, 0, buf, wbuf.nbytes, n0); apersistence_io_write#(bleb.leb, wbuf.offset, 0, n1, buf, adr, m, plog, lpt, ns; avol; err); if err = ESUCCESS then {wbuf.content := copy(buf0, n0, wbuf.content, 0, n); wbuf.offset := wbuf.offset + n1; wbuf.nbytes := n} else rofs := true}⟫ ⟨awbuf_write_buf#(n, buf, adr0, m3, plog0, lpt0, ns0, buffered(m4); avol1, rofs0; err0)⟩ (abs(avol1, buffered(m4), wbuf, avol, rofs) ∧ (rofs0 ↔ rofs) ∧ err = err0), bleb = nobuffer

Heuristic symbolic execution applied rule let right

And obtained the following new goals

Rule argument

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