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Proof step 55 from proof refine-read-echdr (previous step)

apebs[m2] = mkpeb(aehdr1, avhdr, buf0, m1, false), pebs[m2] = mkpeb(buf1, m3, false), aehdr = aehdr0, m = m2, m2 < # pebs, m2 < # apebs, abs(pebs, apebs), abs-peb(mkpeb(buf1, m3, false), mkpeb(aehdr1, avhdr, buf0, m1, false)), is-encoded(echdr(m0), subarray(buf1, 0, EB_PAGE_SIZE)), mtd-cons(pebs), ubi-io-inv(apebs), EB_PAGE_SIZE ≤ PEB_SIZE ⊦ ⟨if ubi-io-read-echdr-pre(m, apebs) then {fail_or_success#(; ; err); bitflips := ?; if err = ESUCCESS then aehdr := apebs[m].echdr else aehdr := ?} else abort⟩ (aechdr(m0) = aehdr ∧ (bitflips0 ↔ bitflips) ∧ ESUCCESS = err), subarray(buf1, 0, EB_PAGE_SIZE) = emptypage

Heuristic conditional right split applied rule if right

And obtained the following new goals

Rule argument

pos: right 1

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