| err0 = EBADFD, n = n0, ofh = abs-of(of), root.dir?, dom of < ino, abs(root, ROOT_INO)(dirs), afs-cons(dirs, files), fids-cons(root, abs-files(files), abs-of(of)), of-cons(of, dirs, files), psynced → asynced ⊦ ⟨skip⟩ (ofh = abs-of(of) ∧ (psynced → asynced) ∧ n0 = n ∧ EBADFD = err0), fd ∈ of |