Do not lose this

cinnabar.m

    config.load(Config, !IO),
    ( Config ^ config.gl_version = window.gl_version(2, _) ->
        thread.mvar.init(TimeMVar, !IO),
        thread.mvar.init(SceneMVar, !IO),
        thread.mvar.put(SceneMVar, gl2_scene, !IO),
        thread.mvar.put(TimeMVar, 0, !IO),
        Renderer = render(gl2_render.gl2_render, SceneMVar),
        Engine = engine(gl2_render.gl2_render, TimeMVar, SceneMVar),
        window.run_threaded(
    ;
        true % Pass.
    ).