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Proof step 4 from proof inv-seek (previous step)

err0 = err, root.dir?, fids-cons(root, fs, ofh) ⊦ ⟪choose err with pre-seek(fd, n, whence, err, user, root, fs, ofh) in err0 := err; if err0 = ESUCCESS then let fh = ofh[fd] in let f = fs[fh.fid] in {if whence = SEEK_CUR then n := fh.pos + n else if whence = SEEK_END then n := # f.content + n; ofh[fd].pos := n}⟫ fids-cons(root, fs, ofh)

Heuristic symbolic execution applied rule choose right

And obtained the following new goals

Proof step 5:
err0 = err1, root.dir?, fids-cons(root, fs, ofh), pre-seek(fd, n, whence, err, user, root, fs, ofh) ⊦ ⟪err0 := err; if err0 = ESUCCESS then let fh = ofh[fd] in let f = fs[fh.fid] in {if whence = SEEK_CUR then n := fh.pos + n else if whence = SEEK_END then n := # f.content + n; ofh[fd].pos := n}⟫ fids-cons(root, fs, ofh)
Proof step 31:
err0 = err, root.dir?, fids-cons(root, fs, ofh) ⊦ ∃ err. pre-seek(fd, n, whence, err, user, root, fs, ofh)

Proof step 4 from proof inv-seek (previous step)

Heuristic symbolic execution applied rule choose right

And obtained the following new goals

Rule argument

Additional information