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Proof step 251 from proof refine-read (previous step)

of[fd] = mkfile(m, mode, m0), buf = buf0, err0 = err2, n = n0, ofh = abs-of(of), root.dir?, dom of < ino2, abs(root, ROOT_INO)(dirs), afs-cons(dirs, files), fids-cons(root, abs-files(files), abs-of(of)), of-cons(of, dirs, files), fd ∈ of, n0 ≤ # buf0, ⌊err2⌋ , psynced → asynced ⊦ ⟨if err0 = ESUCCESS then let fh = ofh[fd] in let f = abs-files(files)[fh.fid] in choose n with n ≤ n0 ∧ fh.pos + n ≤ # f.content in {n0 := n; buf := copy(f.content, fh.pos, buf, 0, n0); ofh[fd].pos := fh.pos + n0} ifnone n0 := 0 else n0 := ?⟩ (ofh = abs-of(of) ∧ (psynced → asynced) ∧ buf0 = buf ∧ n = n0 ∧ err2 = err0), mode ≠ MODE_R ∧ mode ≠ MODE_RW

Heuristic symbolic execution applied rule if negative right

And obtained the following new goals

Proof step 252:
of[fd] = mkfile(m, mode, m0), buf = buf0, err0 = err2, n = n0, ofh = abs-of(of), root.dir?, dom of < ino2, abs(root, ROOT_INO)(dirs), afs-cons(dirs, files), fids-cons(root, abs-files(files), abs-of(of)), of-cons(of, dirs, files), fd ∈ of, n0 ≤ # buf0, ⌊err2⌋ , psynced → asynced ⊦ ⟨n0 := ?⟩ (ofh = abs-of(of) ∧ (psynced → asynced) ∧ buf0 = buf ∧ n = n0 ∧ err2 = err0), mode ≠ MODE_R ∧ mode ≠ MODE_RW

Rule argument

Additional information

Used simplifier rules: ⊦ ⌊err⌋ → err ≠ ESUCCESS; (s)