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Proof step 7 from proof inv-format (previous step)

err = ESUCCESS, err = err0, ⌊err0⌋ ∨ err0 = ESUCCESS ⊦ ⟪choose apebs0 with ubi-io-initial(apebs0) in apebs := apebs0⟫ (err = ESUCCESS → ubi-io-inv(apebs))

Heuristic symbolic execution applied rule choose right

And obtained the following new goals

Proof step 8:
err = err0, err = ESUCCESS, ubi-io-initial(apebs0), ⌊err0⌋ ∨ err0 = ESUCCESS ⊦ ⟪apebs := apebs0⟫ (err = ESUCCESS → ubi-io-inv(apebs))
Proof step 9:
err = err0, err = ESUCCESS, ⌊err0⌋ ∨ err0 = ESUCCESS ⊦ ∃ apebs0. ubi-io-initial(apebs0)

Proof step 7 from proof inv-format (previous step)

Heuristic symbolic execution applied rule choose right

And obtained the following new goals

Rule argument

Additional information