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Proof step 9 from proof write-term (previous step)

dirs0 = dirs, err = ESUCCESS, afs-cons(dirs, files), of-cons(of, dirs, files), fd ∈ of, n ≤ # buf, of[fd].mode ≠ MODE_W → fd ∈ of ⊦ ⟪err := EBADFD⟫ (dirs0 = dirs), of[fd].mode = MODE_RW, of[fd].mode = MODE_W

Proof step 9 from proof write-term (previous step)

Heuristic symbolic execution applied rule assign right

And closed the goal!

Rule argument

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