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Proof step 4 from proof initialization (previous step)

⊦ ⟪fail_or_success#(; ; err); if err = ESUCCESS then avols := ∅ else avols := ?; if err = ESUCCESS then {v := default-volid; ebm_create_volume#(v, m; avols; err)}⟫ ( (err = ESUCCESS → ⟨ebm_avol_format#(m; ; avol0, err0)⟩ (avol0 = abs(avols[v]) ∧ ESUCCESS = err0)) ∧ (err ≠ ESUCCESS → (∀ avol. ⟨ebm_avol_format#(m; ; avol0, err0)⟩ (avol = avol0 ∧ err = err0))))

Heuristic unfold applied rule call right

And obtained the following new goals

Proof step 5:
⊦ ⟪choose err0 with ⌊err0⌋ ∨ err0 = ESUCCESS in err := err0; if err = ESUCCESS then avols := ∅ else avols := ?; if err = ESUCCESS then {v := default-volid; ebm_create_volume#(v, m; avols; err)}⟫ ( (err = ESUCCESS → ⟨ebm_avol_format#(m; ; avol0, err0)⟩ (avol0 = abs(avols[v]) ∧ ESUCCESS = err0)) ∧ (err ≠ ESUCCESS → (∀ avol. ⟨ebm_avol_format#(m; ; avol0, err0)⟩ (avol = avol0 ∧ err = err0))))

Rule argument

pos: right 1

Additional information

Used simplifier rules: fail_or_success#(; ; ERR) {choose ERR0 with ⌊ERR0⌋ ∨ ERR0 = ESUCCESS in ERR := ERR0};