WTF does "Enforcement failed" actually mean?

[Russel Winder via Digitalmars-d-learn]

On Wed, 2015-09-30 at 23:35 -0700, Ali Çehreli via Digitalmars-d-learn
wrote:
> On 09/30/2015 10:46 PM, Russel Winder via Digitalmars-d-learn wrote:
> > I have the code:
> > 
> > 	reduce!"a+b"(x)
> > 
> > where x is a int[] and I get an exception "Enforcement failed" at
> > run
> > time. This gives me enough information to say ¿que?
> > 
> 
> It's coming from the following no-message enforce():
> 
>              enforce(!r.empty);
> 
>  
> https://github.com/D-Programming-Language/phobos/blob/master/std/algo
> rithm/iteration.d#L2481
> 
> You are using the no-seed version of reduce(), which uses the first 
> element as seed, which means that the range cannot be empty.

Well that explanation (*) makes it abundantly clear that the error
reporting from this part of Phobos is distinctly substandard, let alone
below par.


(*) Which is clear and informative!
-- 
Russel.
=============================================================================
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder at ekiga.net
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel at winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder

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