is(x = module) vs. __traits(isModule, x)

[Walter Bright]

On 10/8/2020 7:19 AM, Steven Schveighoffer wrote:
> I think the AliasSeq pattern still runs through the template machinery, which is 
> not a good thing. But perhaps this can be addressed orthogonally.

Nah, it short-circuits that machinery. Recognizing the AliasSeq pattern and 
doing it directly was a huge win.

We can do the same as necessary for __traits if it comes to that.