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Proof step 120 from proof inv-read-gblock-nodes (previous step)

# lpt0 = # avol, # lpt = # avol, # gndx = # lax, LEB_SIZE = n0 + # buf1, avol[m5] = mapped(buf1), err = ESUCCESS, m = 2 * NODE_HEADER_SIZE + align↑(ndhd.size, 2 * NODE_HEADER_SIZE), m0 = m1, m2 = LEB_SIZE, avol[m5].mapped?, m1 < LEB_SIZE, m5 < # avol, abs-nodes(buf1, gndx, lax, true), awbuf-inv(avol, bleb), buf-ro-rw-mode(isbuf, bleb, lpt0, avol), bufs-log-only(bleb, log0, lpt0), lpt-free-unref(lpt), lpt-leb-size(lpt), lpt-ram-flash(lpt0, lpt, log0), range= (copy(avol[m5].data + mkempbuf(n0), 0, mkbuf(LEB_SIZE), 0, LEB_SIZE), m0 + NODE_HEADER_SIZE + align↑(ndhd.size, 2 * NODE_HEADER_SIZE), validtrailer, 0, NODE_HEADER_SIZE), read-gblock-inv(m5, m1, ax, gndx0, ax1, gndx2, buf1, false), # buf1 ≤ LEB_SIZE, m1 + NODE_HEADER_SIZE ≤ LEB_SIZE, 0 + LEB_SIZE ≤ # mkbuf(LEB_SIZE), 0 + LEB_SIZE ≤ #(avol[m5].data + mkempbuf(n0)), err = ESUCCESS → is-encoded(ndhd, subarray(buf1 + mkempbuf(n0), m1, NODE_HEADER_SIZE)), err = ESUCCESS ∨ ⌊err⌋ ⊦ ⟪let gnd = ? in {decode_group_node#(m0, m, copy(avol[m5].data + mkempbuf(n0), 0, mkbuf(LEB_SIZE), 0, LEB_SIZE); gnd; err); if err ≠ ESUCCESS then debug#("persistence: read_gblock_nodes could not decode node at offset " + m0.toString + " in LEB " + m5.toString) else {gndx0 := gndx0 + gnd '; ax := ax + @(m5, m0, m) '}}; if err = ESUCCESS then m0 := m0 + m⟫ ( (err = ESUCCESS ∨ err = ENOENT ∨ ⌊err⌋ ) ∧ (err = ESUCCESS ∨ err = ENOENT → read-gblock-inv(m5, m0, ax, gndx0, ax1, gndx2, avol[m5].data, err = ENOENT)) ∧ (err ≠ ESUCCESS ⊃ 0;m2 - m0) < m2 - m1), ndhd.ispadding, m2 < m0 + m, isempty(buf1 + mkempbuf(n0), m1, NODE_HEADER_SIZE)

Heuristic symbolic execution applied rule let right

And obtained the following new goals

Rule argument

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