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Proof step 9 from proof inv-write-echdr (previous step)

apebs[n] = mkpeb(empty, avhdr, buf, m, false), aehdr.valid?, n < # apebs, ubi-io-inv(apebs), ⌊err0⌋ ∨ err0 = ESUCCESS ⊦ ⟪err := err0; if err = ESUCCESS then apebs[n].echdr := aehdr else choose aehdr with ¬ aehdr.valid? in apebs[n].echdr := aehdr⟫ ubi-io-inv(apebs)

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Proof step 10:
apebs[n] = mkpeb(empty, avhdr, buf, m, false), aehdr.valid?, n < # apebs, ubi-io-inv(apebs), ⌊err0⌋ ∨ err0 = ESUCCESS ⊦ ⟪if err0 = ESUCCESS then apebs[n].echdr := aehdr else choose aehdr with ¬ aehdr.valid? in apebs[n].echdr := aehdr⟫ ubi-io-inv(apebs)

Proof step 9 from proof inv-write-echdr (previous step)

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Rule argument

Additional information