Eric Blake writes:
> None of the existing QMP or QGA interfaces uses a union with a
> base type but no discriminator; it is easier to avoid this in the
> generator to save room for other future extensions more likely to
> be useful. A previous commit added a union-base-no-discriminator
> test to
None of the existing QMP or QGA interfaces uses a union with a
base type but no discriminator; it is easier to avoid this in the
generator to save room for other future extensions more likely to
be useful. A previous commit added a union-base-no-discriminator
test to ensure that we eventually give
