restriction on sum: intentional bug?

[Alan G Isaac]

On 10/16/2009 5:03 PM, Christian Heimes wrote:
> It's not going to happen.

That's a prediction, not a justification.

As Tim explained in detail, and as Peter
explained with brevity, whether it will
happen or not, it should happen.  This
conversation has confirmed that current
behavior is a wart: an error is raised
despite correct semantics. Ugly!

Alan Isaac