[bigfishrunning]

I agree with this. Rust has a node-style dependency problem; any non-trivial rust project ends up with dozens of dependencies in my experience. I would add tokio to the list of dependencies-so-common-they-should-be-moved-to-stdin.

A second tier stdlib would turn out like the Boost c++ libraries -- an 800 lb gorilla of a common dependency that gets called in just to do something very simple; although to be fair most of the Boost functionality already is in rust's stdlib.

[SAI_Peregrinus]

As long as the "2nd-tier" stdlib was versioned & tied in with the edition system, it could work. The problem with most stdlibs (including Rust's) is that there's no way to remove anything & replace it with a better design. So the lib only ever grows, slowly adding complexity.