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

⊦ ⟪fail_or_success#(; ; err); lpt0 := lpt; if err = ESUCCESS then {avol := fill(mkavolume(# lpt), unmapped); adr := adr0; m := m0; plog := []; lpt := lpt0; ns := ∅} else avol := ?, adr := ?, m := ?, plog := ?, lpt := ?, ns := ?⟫ (err = ESUCCESS → ebm-vol-inv(avol) ∧ # lpt = # avol)

Heuristic unfold applied rule call right

And obtained the following new goals

Proof step 6:
⊦ ⟪choose err0 with ⌊err0⌋ ∨ err0 = ESUCCESS in err := err0; lpt0 := lpt; if err = ESUCCESS then {avol := fill(mkavolume(# lpt), unmapped); adr := adr0; m := m0; plog := []; lpt := lpt0; ns := ∅} else avol := ?, adr := ?, m := ?, plog := ?, lpt := ?, ns := ?⟫ (err = ESUCCESS → ebm-vol-inv(avol) ∧ # lpt = # avol)

Rule argument

pos: right 1

Additional information

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