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Proof step 12 from proof inv-readdir (previous step)

afs-cons(dirs, files), m ∈ dirs ⊦ ⟪choose err0 with ⌊err0⌋ in err := err0⟫ true

Heuristic symbolic execution applied rule choose right

And obtained the following new goals

Proof step 13:
afs-cons(dirs, files), m ∈ dirs, ⌊err0⌋ ⊦ ⟪err := err0⟫ true
Proof step 14:
afs-cons(dirs, files), m ∈ dirs ⊦ ∃ err0. ⌊err0⌋

Rule argument

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