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Proof step 15 from proof crash-neutral-write-vidhdr (previous step)

apebs[n] = mkpeb(aehdr, empty, buf, m, false), apebs0 = apebs, aehdr.valid?, avhdr.valid?, n < # apebs, ubi-io-inv(apebs) ⊦ ⟨choose avhdr with ¬ avhdr.valid? in apebs[n].vidhdr := avhdr⟩ (apebs0 = apebs)

Heuristic symbolic execution applied rule choose right

And obtained the following new goals

Proof step 16:
apebs[n] = mkpeb(aehdr, empty, buf, m, false), apebs0 = apebs, avhdr0.valid?, aehdr.valid?, n < # apebs, ubi-io-inv(apebs) ⊦ ∃ avhdr. ¬ avhdr.valid? ∧ ⟨apebs[n].vidhdr := avhdr⟩ (apebs0 = apebs)

Proof step 15 from proof crash-neutral-write-vidhdr (previous step)

Heuristic symbolic execution applied rule choose right

And obtained the following new goals

Rule argument

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