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Proof step 22 from proof inv-format (previous step)

err = ESUCCESS, err0 = ESUCCESS, m = m1, m0 = EB_PAGE_SIZE, m2 = 0, n = # pebs0, n = # pebs, m < n, mtd-cons(pebs0), mtd-cons(pebs), m ≤ n, err = ESUCCESS → ubi-io-initial(subarray(pebs, 0, m)), err = ESUCCESS ∨ ⌊err⌋ ⊦ ⟪let isbad = ? in {mtd_asm_isbad#(m, pebs; ; isbad, err); if err = ESUCCESS ∧ ¬ isbad then let aehdr = ?, bitflips = ? in {ubi_io_read_echdr#(m, m0, pebs; aehdr; bitflips, err); let n = (err = ESUCCESS ∧ aehdr.valid? ⊃ aehdr.ec + 1;0) in {mtd_asm_erase#(m; pebs; err); if err = ESUCCESS then ubi_io_write_echdr#(m, aechdr(n), m0; pebs; err)}}}; m := m + 1⟫ ( (m ≤ n ∧ n = # pebs ∧ mtd-cons(pebs) ∧ (err = ESUCCESS → ubi-io-initial(subarray(pebs, 0, m))) ∧ (err = ESUCCESS ∨ ⌊err⌋ )) ∧ n - m < n - m1)

Heuristic symbolic execution applied rule let right

And obtained the following new goals

Proof step 23:
err = ESUCCESS, err0 = ESUCCESS, m = m1, m0 = EB_PAGE_SIZE, m2 = 0, n = # pebs, n = # pebs0, m < n, mtd-cons(pebs), mtd-cons(pebs0), m ≤ n, err = ESUCCESS → ubi-io-initial(subarray(pebs, 0, m)), err = ESUCCESS ∨ ⌊err⌋ ⊦ ⟪mtd_asm_isbad#(m, pebs; ; isbad, err); if err = ESUCCESS ∧ ¬ isbad then let aehdr = ?, bitflips = ? in {ubi_io_read_echdr#(m, m0, pebs; aehdr; bitflips, err); let n = (err = ESUCCESS ∧ aehdr.valid? ⊃ aehdr.ec + 1;0) in {mtd_asm_erase#(m; pebs; err); if err = ESUCCESS then ubi_io_write_echdr#(m, aechdr(n), m0; pebs; err)}}; m := m + 1⟫ ( (m ≤ n ∧ n = # pebs ∧ mtd-cons(pebs) ∧ (err = ESUCCESS → ubi-io-initial(subarray(pebs, 0, m))) ∧ (err = ESUCCESS ∨ ⌊err⌋ )) ∧ n - m < n - m1)

Proof step 22 from proof inv-format (previous step)

Heuristic symbolic execution applied rule let right

And obtained the following new goals

Rule argument

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