How can I test at compile time whether T is an instance of an interface ?

[wjoe]

On Wednesday, 23 September 2020 at 19:08:47 UTC, data pulverizer 
wrote:
> On Wednesday, 23 September 2020 at 18:56:33 UTC, wjoe wrote:
>> [...]
>
> Didn't think that the compiler didn't know but wasn't aware 
> that you could use that information to statically dispatch. My 
> mistake, I'll shut up now!

Appologies if you took offense. Your replies are very much 
appreciated.