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Proof step 11 from proof inv-format (previous step)

⊦ ⟪fail#(; ; err)⟫ (err = ESUCCESS → asynced ∧ afs-cons(dirs, files))

Heuristic unfold applied rule call right

And obtained the following new goals

Proof step 12:
⊦ ⟪choose err0 with ⌊err0⌋ in err := err0⟫ (err = ESUCCESS → asynced ∧ afs-cons(dirs, files))

Rule argument

pos: right 1

Additional information

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