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Proof step 4 from proof crash-neutral-recover (previous step)

ebm-vol-inv(avol), avol ⊆ avol0 ⊦ ∃ err0. (⌊err0⌋ ∨ err0 = ESUCCESS) ∧ ⟨err := err0; if err ≠ ESUCCESS then avol := ?⟩ (avol ⊆ avol0)

User applied rule exists right

And obtained the following new goals

Proof step 5:
ebm-vol-inv(avol), avol ⊆ avol0 ⊦ (⌊EIO⌋ ∨ EIO = ESUCCESS) ∧ ⟨err := EIO; if err ≠ ESUCCESS then avol := ?⟩ (avol ⊆ avol0)

Rule argument

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

Additional information

Used terms: EIO