Ralf Hemmecke wrote:
> 
> On 09/17/2016 02:54 AM, Kurt Pagani wrote:
> > Today I've compiled svn rev. 2122. Afterwards, while compiling and
> > testing some old code, I got the following (runtime) error several times:
> > 
> > Function:  -? : % -> % is missing from domain: NonNegativeInteger
> >    Internal Error
> >    The function - with signature $$ is missing from domain
> >       NonNegativeInteger
> 
> This is a good thing. The negation of an element of NNI is not in NNI
> unless this element is 0.

We should get error earlier: type checking is supposed to
catch such things.

-- 
                              Waldek Hebisch

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