"No semantic effect" is one of those recurring C++ tropes like the "subset of a superset" or "trading performance for safety" that I think even its defenders ought to call bullshit on. The insistence on "No semantic effect" for attributes has poisoned them badly, and the choice to just ignore the semantic implications for Bjarne's C++ 20 Concepts makes this a poor substitute for the concepts feature as once imagined at the start of the century.

I doubt I can satisfy you as to whether I'm somehow a paid evangelist, I remember I got a free meal once for contributing to the OSM project, and I bet if I dig further I can find some other occasion that, if you spin it hard enough can be justified as "payment" for my opinion that Rust is a good language. There was a nice lady giving our free cookies at the anti-racist counter-protests the other week, maybe she once met a guy who worked for an outfit which was contracted to print a Rust book? I sense you may own a corkboard and a lot of red string.

But what’s the relevance of all of this to bird law?