What you can do is declare it as a regular texture, and then invoke it using the
interior_texture keyword.

Think about it like object {}.
Once you already have a "thing" declared, you can USE that object {} in
something like a CSG - but I don't believe that you can do it all in one go.
(as in: object {sphere {0, 1}} )
[I don't have the parser handy to check]

So in the same way, you need to make a "thing" - your texture - and THEN you can
USE that texture in a construct to assign it as the interior_texture.

(and yes, I've tried declaring an interior_texture in exactly the way you're
trying to, and was initially irked until I grasped the paradigm.)

- BW

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