Thanks for the fast response.  I updated the l3kernel bundle and all is now
well.  Unfortunately, I'm not doing anything interesting with it: testing
for division by zero in a context that shouldn't give an error.  It's quite
nice to have the option to do so though!
scott

On Mon, Aug 27, 2012 at 2:35 PM, Bruno Le Floch <[log in to unmask]> wrote:

> Hello Scott,
>
> I had mistakenly defined the internal \__fp_trap:nn and documented
> \fp_trap:nn.
>
> This should be fixed in a more recent version of the l3kernel bundle
> (and I updated the "added" date).  Can you update to a version later
> than 2012/07/19?
>
> I'm very interested to have feedback on that function: this is very
> much experimental, and I am not yet sure how much I should implement
> of IEEE's trap mechanism.
>
> Sorry for the mistake.
>
> Bruno
>
> On 8/27/12, scott heard <[log in to unmask]> wrote:
> > Hello, I'm getting an undefined control sequence when trying to use this
> in
> > a
> > minimal document as "\fp_trap:nn {invalid_operation}{none}".
> > The documentation I have says that it was added on 2012-05-28 and the
> > version of
> > expl3 that I have is v3990, dated 2012/07/16.  Is this an issue on my
> end?
> > scott
> >
>