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Proof step 7 from proof synced-write-buf (previous step)

⟨awbuf_write_buf#(n, buf, adr, m, nx, lpt, ns, buffered(m1); avol, isbuf; err)⟩ (avol = avol1 ∧ (isbuf ↔ isbuf0) ∧ err = err0), # lpt = # avol, avol[m1] = mapped(buf0), bleb = buffered(m1), m0 = m, n0 = n, m1 < # avol, awbuf-inv(avol, buffered(m1)), avol0 ↓ avol1, # buf0 + n ≤ LEB_SIZE, n ≤ # buf ⊦ ⟨if bleb ≠ nobuffer ∧ # avol[bleb.leb].data + n0 ≤ LEB_SIZE ∧ n0 ≤ # buf then if isbuf then err := EROFS else {fail_or_success#(; ; err); let m = bleb.leb in if err = ESUCCESS then avol[m] := mapped(avol[m].data + subarray(buf, 0, n0)) else { choose n with n ≠ 0 ∧ n < n0 ∧ is-aligned(# avol[m].data + n, EB_PAGE_SIZE) in avol[m] := mapped(avol[m].data + subarray(buf, 0, n)) ifnone skip or skip; isbuf := true}} else abort⟩ (synced(avol) ∧ avol0 ↓ avol), avol0 ↓ avol

Heuristic symbolic execution applied rule if right

And obtained the following new goals

Rule argument

pos: right 1

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