static unittest

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On Wednesday, 30 April 2014 at 16:55:06 UTC, Andrei Alexandrescu 
wrote:
> Walter and I also discussed "static unittest" a while ago - 
> yes, another use of static :o).
>
> A static unittest would be evaluated only during compilation, 
> and would prove things that fall in the realm of static 
> checking but are not verifiable with traditional typesystem 
> approach.
>
> That won't enable things we can't do today (there's always 
> assert(__traits(compiles, ...)) but it's instantly 
> recognizable, very easy to use, and pushes semantic checking to 
> a whole new level.
>
> Thoughts?
>
>
> Andrei

There's also

unittest
{
     static assert(...);
}