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Proof step 4 from proof crash-neutral-seek (previous step)

err0 = err, psynced, root.dir?, fids-cons(root, fs, ofh), posix-crash(root, fs, ofh, tree, fs0, ofh0) ⊦ ⟨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}⟩ (psynced ∧ posix-crash(root, fs, ofh, tree, fs0, ofh0))

Heuristic symbolic execution applied rule choose right

And obtained the following new goals

Proof step 5:
err0 = err1, psynced, root.dir?, fids-cons(root, fs, ofh), posix-crash(root, fs, ofh, tree, fs0, ofh0) ⊦ ∃ err. 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}⟩ (psynced ∧ posix-crash(root, fs, ofh, tree, fs0, ofh0))

Proof step 4 from proof crash-neutral-seek (previous step)

Heuristic symbolic execution applied rule choose right

And obtained the following new goals

Rule argument

Additional information