Rust's String type is in the standard library [1], rather than in the language core where things like str live [2]. There's a lot of stuff in the standard libra

Rust's String type is in the standard library [1], rather than in the language core where things like str live [2]. There's a lot of stuff in the standard library that assumes that it can allocate, and will panic on failure. The solution for now is simply to use Rust's `no_std` support [3] and not import the standard library into kernel code, since it's unsuitable for writing kernel code. In the longer term, Rust is investigating adding fallible variants for all of the standard library traits, so that kernel code could use the standard library with a compiler flag enabled that bans usage of any of the infallible standard library traits. There was a lot of discussion about this a few months ago in https://news.ycombinator.com/item?id=26812047 https://news.ycombinator.com/item?id=26812047. [1] https://doc.rust-lang.org/std/string/struct.String.html https://doc.rust-lang.org/std/string/struct.String.html [2] https://doc.rust-lang.org/core/str/index.html https://doc.rust-lang.org/core/str/index.html [3] https://docs.rust-embedded.org/book/intro/no-std.html https://docs.rust-embedded.org/book/intro/no-std.html [4] https://github.com/rust-lang/rfcs/blob/master/text/2116-alloc-me-maybe.md https://github.com/rust-lang/rfcs/blob/master/text/2116-allo...