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

fs = fs0, ofh = ofh0, tree.dir?, fids-cons(tree, fs1, ofh1), posix-crash(tree, fs1, ofh1, root, fs0, ofh0) ⊦ ⟪fail_or_success#(; ; err); if err ≠ ESUCCESS then root := ?, fs := ?, ofh := ?, psynced := ? else psynced := true⟫ (err = ESUCCESS → psynced ∧ root.dir? ∧ fids-cons(root, fs, ofh))

Heuristic unfold applied rule call right

And obtained the following new goals

Proof step 6:
fs = fs0, ofh = ofh0, tree.dir?, fids-cons(tree, fs1, ofh1), posix-crash(tree, fs1, ofh1, root, fs0, ofh0) ⊦ ⟪choose err0 with ⌊err0⌋ ∨ err0 = ESUCCESS in err := err0; if err ≠ ESUCCESS then root := ?, fs := ?, ofh := ?, psynced := ? else psynced := true⟫ (err = ESUCCESS → psynced ∧ root.dir? ∧ fids-cons(root, fs, ofh))

Rule argument

pos: right 1

Additional information

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