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Proof step 177 from proof encode-node (previous step)

# buf = n0 + n + 2 * NODE_HEADER_SIZE + nd.alignedsize, # buf0 = # buf, m0 = align↑(node-size-headerless(nd), 2 * NODE_HEADER_SIZE), m3 = n, subarray(buf0, n + NODE_HEADER_SIZE, # buf - n + NODE_HEADER_SIZE) = subarray(buf, n + NODE_HEADER_SIZE, # buf - n + NODE_HEADER_SIZE), subarray(buf0, 0, n) = subarray(buf, 0, n), n + 2 * NODE_HEADER_SIZE + nd.alignedsize ≤ # buf, n + NODE_HEADER_SIZE ≤ # buf, err = ESUCCESS → is-encoded(nodeheader(node-size-headerless(nd), false), subarray(buf0, n, NODE_HEADER_SIZE)), err = ESUCCESS ∨ ⌊err⌋ ⊦ ⟪skip; m2 := 2 * NODE_HEADER_SIZE + m0⟫ ( (err = ESUCCESS ∨ ⌊err⌋ ) ∧ # buf0 = # buf ∧ subarray(buf0, 0, n) = subarray(buf, 0, n) ∧ subarray(buf0, n + 2 * NODE_HEADER_SIZE + nd.alignedsize, n0) = subarray(buf, n + 2 * NODE_HEADER_SIZE + nd.alignedsize, n0) ∧ ( err = ESUCCESS → (∃ buf2, buf1. subarray(buf0, n, 2 * NODE_HEADER_SIZE + nd.alignedsize) = buf2 + buf1 + validtrailer ∧ is-encoded(nodeheader(node-size-headerless(nd), false), buf2) ∧ is-encoded(nd, subarray(buf1, 0, node-size-headerless(nd))) ∧ # buf1 = nd.alignedsize) ∧ m2 = 2 * NODE_HEADER_SIZE + nd.alignedsize)), err = ESUCCESS

Heuristic symbolic execution applied rule skip right

And obtained the following new goals

Rule argument

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