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

err = ESUCCESS, err0 = err1, f = fs[fh.fid], fh = ofh[fd], n0 = n1, root.dir?, fids-cons(root, fs, ofh), pre-read(fd, n0, err, user, root, fs, ofh), fd ∈ ofh, fh.fid ∈ fs, 0 + n ≤ # buf, n ≤ n0, fh.pos + n ≤ # f.content, n1 ≤ # buf ⊦ ⟪ofh[fd].pos := fh.pos + n⟫ fids-cons(root, fs, ofh)

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Proof step 13:
err = ESUCCESS, err0 = err1, f = fs[fh.fid], fh = ofh[fd], n0 = n1, root.dir?, fids-cons(root, fs, ofh), pre-read(fd, n0, err, user, root, fs, ofh), fh.fid ∈ fs, fd ∈ ofh, n1 ≤ # buf, fh.pos + n ≤ # f.content, n ≤ n0, 0 + n ≤ # buf ⊦ fids-cons(root, fs, ofh[fd, ofh[fd].pos:= (fh.pos + n)])

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

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Rule argument

Additional information