Actually, I am looking for more than this because I think Rust actually has a number of libraries that I think function fairly similarly to Boost. What I really want is the language committing to a library that is available without a third-party dependency, basically under a "linking exception" to be extremely close to "use however you want", supported by the people developing the language, designed alongside the language to remain ergonomic, with support that is tied to the language, … Personally, I consider this to be a very valuable feature from a programming language. Having a "pretty good" solution available "for free" is immensely value compared to having to go look online for every little thing, evaluate the landscape, audit it, ensure the licensing matches, consider whether will remain supported, and try to work around its idiosyncrasies.