cargo-udeps VS rust-analyzer

I'm releasing cargo-udeps 0.1.33 today. The release marks a big change in the evolution of cargo-udeps, as the default backend is changed from using save-analysis to depinfo. This change was needed because the compiler is removing support for save-analysis. I will remove support for the save-analysis backend entirely in a couple of weeks, when the 1.64 release is made, and I'll update cargo-udeps to the new cargo release.

rust-analyzer only provides a handful of diagnostics by itself, everything else is forwarded from cargo check (if checkOnSave is enabled). Neither tool currently emits a warning for unused dependencies, since it's pretty hard to do, but cargo-udeps can do it (though I'm not sure how reliable it is).

Maybe an extension to cargo-udeps?

cargo-udeps does a great job at letting us know which dependencies in our `Cargo.toml` are left unused. I am pretty impressed with it.

You can also turn off debuginfo completely. Personally, someone who does printf debugging, I mainly need it to debug segfaults, which are really rare in Rust. Sometimes the call stack of a panic is useful as well, but if I need debuginfo I can just re-enable it.

https://github.com/est31/cargo-udeps/commit/e550d93c7a6d756e...

go build 3.62s user 0.76s system 171% cpu 2.545 total

I was looking forward to parallel front-end[4], but I have not seen any improvement for these small changes.

[1]: https://github.com/rust-lang/rust-analyzer

For example, intelephense can show diagnostics in real time, there is no need to save the file to get new diagnostics. But rust-analyzer, the language server for rust, can only update diagnostics after saving the file.

6. Rust Analyzer

The rust-analyzer readme suggests you go here for support request. But even there, you'll need to provide more details to get useful help.

For example: https://github.com/rust-lang/rust-analyzer/blob/master/docs/...

> If you create an LSP, it will work best in VS Code.

Any editor can work just as well as (or even better than) VS Code.

So, apparently the reason why rust-analyzer, the LSP server for Rust does not have persistent caching is because it would make "optimizing initial passes less important".

All I want to know is: Will it have a build configuration pulldown?

I am not a Rust dev. It surely looks great.

However, from what I understand it seems to supply just a parser separate from the Rust compiler (https://github.com/rust-lang/rust-analyzer/tree/master/crate...) trying to keep up with Rust‘s development. So, in principle, it could have been just another treesitter parser plugin, too.

So, again, the LSP framework does not directly provide any magical benefit over a static parsing framework. All the semantic analysis capabilities stem from a good parser.

rust-analyzer > manual > helix > binary > rustup component add rust-analyzer