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Proof step 7 from proof crash-neutral-isbad (previous step)

n < # apebs, ubi-io-inv(apebs) ⊦ ∃ err0. (⌊err0⌋ ∨ err0 = ESUCCESS) ∧ ⟨err := err0; if err = ESUCCESS then isbad := apebs[n].bad else isbad := ?⟩ true

User applied rule exists right

And obtained the following new goals

Proof step 8:
n < # apebs, ubi-io-inv(apebs) ⊦ (⌊EIO⌋ ∨ EIO = ESUCCESS) ∧ ⟨err := EIO; if err = ESUCCESS then isbad := apebs[n].bad else isbad := ?⟩ true

Rule argument

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

Additional information

Used terms: EIO