Adam D. Ruppe:
>       static assert(!__traits(compiles, octal!"not a number"));
> [...]
> So I see the use, but I don't think any special syntax is required. This
> works well enough.

Improving that syntax is not necessary, but in my dlibs1 I have to use 
something like that (using is()) for about 70 KB of templates, it gets tiring 
and it's easy to make mistakes :-) So even if it's not necessary, it can be 
handy for me.

My post about unit test features contains other things worth discussing about. 
This was just the first point :-)

Bye,
bearophile

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