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 > > >