Why code failed to compile for foo2?

Adam Ruppe destructionator at gmail.com
Sat Dec 11 23:44:59 UTC 2021

On Saturday, 11 December 2021 at 23:17:17 UTC, Stanislav Blinov 
> ? No. If it was unsatisfied constraint, the error would've 
> shown that.

And if you try to instantiate it, you'll see it is an unsatisfied 
constraint anyway. There's two layers of failure here.

Using Unqual there is pretty iffy, i wouldn't bother with it at 
all, but if you do anything, instead qualify it const.

But either way, then the constraint still fails since int isn't 

I'd really recommend simplifying this a lot.

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