Bruce wrote:

> I have tried to construct the WeylCharacterRing with base_ring
> polynomials in q with integer coefficients. There were no complaints
> but it seemed to take q to be one of the monomials.

This is a bug. I note that this doesn't happen if we omit the
coroot style.

Nicolas wrote:

> The best fix would be to have, as has been planned some time ago,
> WeylCharacterRing use categories (and by the way
> CombinatorialFreeModule), and this would be automatically handled by
> the coercion system.

I agree that this should be done and will try to do this. However that
will be a lot of work (which is why I haven't done it already) and I
will
first try to fix this bug with the existing framework.

Dan

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