I started working on a Rust SDK but only got as far as generating code from the language and resource protos using tonic-build. I wanted to do this to learn Rust but realised that this is a massive undertaking that is currently beyond my skill level, as it requires knowledge of async, tokio, and a deep understanding of how pulumi works. Also there are a number of architectural decisions that must be made, such as deciding whether to use WASM for providers or using extism (as per github issue
#3622). There are also decisions on how we want the API to look, whether to use macros etc etc. There seems to be a decent amount of interest in a rust SDK, I'd be interested in working on it further but I couldn't be the one to lead such an endeavour; it would require some leadership and guidance from pulumi devs and more experienced rust programmers. Let me know if there's any interest in working on it. The repo with the tonic-build codegen is here
https://github.com/chambers/pulumi-rs/tree/dev