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Proof step 2 from proof ubifs-dir-data (previous step)

fs[ri[inodekey(ino)]].directory, ubifs-cons(fs, ri, ro, fi, fo, log), ri[inodekey(ino)] ∈ ri ⊦ datakeys(inodekey(ino), ri) = ∅

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
fs[ri[inodekey(ino)]].directory, ubifs-cons(fs, ri, ro, fi, fo, log), ri[inodekey(ino)] ∈ ri ⊦ # datakeys(inodekey(ino), ri) = 0, datakeys(inodekey(ino), ri) = ∅

Rule argument

Additional information

Used simplifier rules: size-zero: ⊦ # ks ≠ 0 → ks ≠ ∅; (forward) from specification set-basic[node-index]%size-zero-01: ⊦ ks ≠ ∅ → # ks ≠ 0; (forward) from specification set-basic[node-index]