how to render Shinsuke IRIE's toon in 2.7?

You maybe know “Toon Shading Experiment with Cycles OSL in Blender” by Shinsuke IRIE, which can be found at
The supplied blend file has something wrong which says “ERROR: Closure ‘specular_toon’ is not supported by the current renderer”.
To replace specular_toon with glossy_toon does not produce nice render too.
So the question is what can we do with this OSL script within Blender 2.7?