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Proof step 5 from proof inv-recover (previous step)

avols = avols0, ebm-cons(avols1), ebm-cons(avols0), default-volid ∈ avols1, avols1 ⊆ avols0 ⊦ ⟪fail_or_success#(; ; err); if err ≠ ESUCCESS then avols := ?; v := default-volid⟫ (err = ESUCCESS → default-volid ∈ avols ∧ v = default-volid ∧ ebm-cons(avols))

Heuristic unfold applied rule call right

And obtained the following new goals

Proof step 6:
avols = avols0, ebm-cons(avols0), ebm-cons(avols1), default-volid ∈ avols1, avols1 ⊆ avols0 ⊦ ⟪choose err0 with ⌊err0⌋ ∨ err0 = ESUCCESS in err := err0; if err ≠ ESUCCESS then avols := ?; v := default-volid⟫ (err = ESUCCESS → default-volid ∈ avols ∧ v = default-volid ∧ ebm-cons(avols))

Rule argument

pos: right 1

Additional information

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