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Proof step 18 from proof crash-neutral-write-buf (previous step)

# lpt = # avol, avol[n0] = mapped(buf0), m = buffered(n0).leb, buffered(n0).isbuf?, n0 < # avol, awbuf-inv(avol, buffered(n0)), synced(avol0), avol0 ↓ avol, n ≤ # buf, # buf0 + n ≤ LEB_SIZE ⊦ ⟨isbuf := true⟩ (avol0 ↓ avol), ⟨choose n1 with n1 ≠ 0 ∧ n1 < n ∧ is-aligned(# avol[m].data + n1, EB_PAGE_SIZE) in avol[m] := mapped(avol[m].data + subarray(buf, 0, n1)) ifnone skip; isbuf := true⟩ (avol0 ↓ avol)

Proof step 18 from proof crash-neutral-write-buf (previous step)

Heuristic symbolic execution applied rule assign right

And closed the goal!

Rule argument

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