4:23 you said that sqrt of a floating point can be rewritten with inline assembly. Unless I'm misunderstanding how rustc handles inline assembly I believe that this would make it impossible for the compiler to vectorize it. The thing with intrinsics currently is that they're such a mess that it's hard to say where they should go so that users can find them if you want to remove them from the std library.
Stability attributes feel very Rust-y and if I had a dollar for every time I got a deprecated warning with zero information as to what to use instead!! Like, 30+ years of those! Thank you for the talk and those great ideas🎉
I actually really like that idea for adding preludes for crates that automatically get brought into scope. I think as long as the user of the crate has to opt in to use the prelude, I wouldn't have any issues with it. I feel like that is something that I enjoy about Rust's std lib so I think it would be a great addition for any crate to be able to provide that option too.
Even if it doesn't get to 100%, there are benefits by aspiring to do so. Additionally by dogfooding, there's an incentive for the authors to make Rust as good as possible.
Opt-out preludes are what modpacks are for minecraft. You're bound to get surprising features by using someone else's prelude (modpack), but instead of up to 200 mods, it might be maybe even 800 features
