(rule
   (alias runtest)
   (enabled_if (>= %{ocaml_version} "4.08.0"))
   (deps
      (:test test.ml)
      (package ppxlib))
   (action (chdir %{project_root}
                     (progn
                        (run expect-test %{test})
                        (diff? %{test} %{test}.corrected)))))
