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

err0 = err, root.dir?, fids-cons(root, fs, ofh) ⊦ ⟪choose err with pre-create(path, md, err, user, root, fs, ofh) in err0 := err; if err0 = ESUCCESS then choose fid with ¬ fid ∈ fs in {root[path] := fnode(fid); fs[fid] := mkfile(md, mkbuf(0))}; psynced := ?⟫ (root.dir? ∧ 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-create(path, md, err, user, root, fs, ofh) ⊦ ⟪err0 := err; if err0 = ESUCCESS then choose fid with ¬ fid ∈ fs in {root[path] := fnode(fid); fs[fid] := mkfile(md, mkbuf(0))}; psynced := ?⟫ (root.dir? ∧ fids-cons(root, fs, ofh))
Proof step 25:
err0 = err, root.dir?, fids-cons(root, fs, ofh) ⊦ ∃ err. pre-create(path, md, err, user, root, fs, ofh)

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

Heuristic symbolic execution applied rule choose right

And obtained the following new goals

Rule argument

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