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Proof step 10 from proof crash-neutral-write-vidhdr (previous step)

apebs[n] = mkpeb(aehdr, empty, buf, m, false), avhdr.valid?, aehdr.valid?, n < # apebs, ubi-io-inv(apebs) ⊦ ∃ err0. (⌊err0⌋ ∨ err0 = ESUCCESS) ∧ ⟨err := err0; apebs0 := apebs; if err = ESUCCESS then apebs[n].vidhdr := avhdr else choose avhdr with ¬ avhdr.valid? in apebs[n].vidhdr := avhdr⟩ (apebs0 = apebs)

User applied rule exists right

And obtained the following new goals

Proof step 11:
apebs[n] = mkpeb(aehdr, empty, buf, m, false), aehdr.valid?, avhdr.valid?, n < # apebs, ubi-io-inv(apebs) ⊦ (⌊EIO⌋ ∨ EIO = ESUCCESS) ∧ ⟨err := EIO; apebs0 := apebs; if err = ESUCCESS then apebs[n].vidhdr := avhdr else choose avhdr with ¬ avhdr.valid? in apebs[n].vidhdr := avhdr⟩ (apebs0 = apebs)

Rule argument

pos: right 1 terms: EIO abort: F discard: T computed: T

Additional information

Used terms: EIO