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Proof step 6 from proof prepost-read-orphans (previous step)

m4 + # lpt = # avol, avol[0] = mapped(buf), avol[m1] = mapped(buf0), avol[m0] = mapped(buf1), sb = mksb(adr, m, m0, m1, m2, m3, m4), disk-layout(mksb(adr, m, m0, m1, m2, m3, m4), # lpt), ebm-vol-inv(avol), is-encoded(log, buf1), is-encoded(lpt, lebs(avol, m3, lptlebs(# lpt, LEB_SIZE))), is-encoded(mksb(adr, m, m0, m1, m2, m3, m4), buf), is-encoded-pad(orphans0, m2, buf0), mapped-full?(avol, m3, lptlebs(# lpt, LEB_SIZE)), logoff ≠ LEB_SIZE → # buf1 = logoff ⊦ ⟪let buf = mkbuf(sb.orphsize * ENCODED_NAT_SIZE) in {ebm_avol_read#(sb.orph, 0, 0, sb.orphsize * ENCODED_NAT_SIZE, avol; buf; err); if err = ESUCCESS then persistence_io_decode_orphans#(sb.orphsize, buf; ; orphans, err)}⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → orphans = orphans0))

Heuristic symbolic execution applied rule let right

And obtained the following new goals

Rule argument

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