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Proof step 21 from proof abs-nodes-crash-h (previous step)

# buf2 = NODE_HEADER_SIZE, n < 2 * NODE_HEADER_SIZE + # buf, abs-nodes(buf1, 2 * NODE_HEADER_SIZE + m + # buf, [], [], true), is-aligned(n, NODE_HEADER_SIZE), is-aligned(# buf, 2 * NODE_HEADER_SIZE), is-encoded(nodeheader(# buf, true), buf2), n ≤ 2 * NODE_HEADER_SIZE + # buf + # buf1, ∀ buf3, m, x, lax, n. # buf3 < #((buf2 + buf + validtrailer) + buf1) → abs-nodes(buf3, m, x, lax, true) ∧ is-aligned(n, NODE_HEADER_SIZE) ∧ n ≤ # buf3 → (∃ x0, lax0. x0 ⊑ x ∧ lax0 ⊑ lax ∧ abs-nodes(subarray(buf3, 0, n), m, x0, lax0, true)) ⊦ buf2 + buf + validtrailer = mkbuf(0), n = 0, abs-failed(subarray(buf2 + buf + validtrailer, 0, n)), ∃ buf0, buf1. subarray(buf2 + buf + validtrailer, 0, n) = buf0 + buf1 ∧ abs-padding(buf0) ∧ abs-nodes(buf1, m + # buf0, [], [], true)

User applied rule weakening

And obtained the following new goals

Rule argument

poslist: right 4

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