Avoid ref when using format! in compiler
Clean up a few minor refs in `format!` macro, as it has a performance cost. Apparently the compiler is unable to inline `format!("{}", &variable)`, and does a run-time double-reference instead (format macro already does one level referencing). Inlining format args prevents accidental `&` misuse.
See https://github.com/rust-lang/rust-clippy/issues/10851
Some more small salsa memory improvements
This does limit our lru limits to 2^16 but if you want to set them higher than that you might as well not set them at all. Also makes `LRU` opt-in per query now, allowing us to drop all the unnecessary LRU stuff for most queries
Clean up a few minor refs in `format!` macro, as it has a performance cost. Apparently the compiler is unable to inline `format!("{}", &variable)`, and does a run-time double-reference instead (format macro already does one level referencing). Inlining format args prevents accidental `&` misuse.
feature: teach rust-analyzer to discover `linked_projects`
This PR's been a long-time coming, but like the title says, it introduces server-side project discovery and removes the extension hooks I previously introduced. I don't think this PR is ready to land, but here are the things I'm feeling squishy about:
- I don't think I like the idea of introducing the `cargo-metadata` command-but-for-everything-else in the `flycheck` module, but the progress reporting infrastructure was too convenient to pass up. Happy to move it elsewhere.
Here are the things I _know_ I need to change:
- For progress reporting, I'm extracting from a `serde_json::Value` that corresponds to `tracing_subsciber::fmt::Layer`'s JSON output. I'd like to make this a bit more structured/documented than the current nonsense I wrote.
- The progress reporting currently hardcodes "Buck"; it should be deriving that from the previously mentioned more-structured-output.
- This doesn't handle *reloading* when a corresponding buildfile is changed. It should be doing that.
<details>
<summary>Anyway, here's a video of rust-analyzer discovering a Buck target.</summary>
https://github.com/rust-lang/rust-analyzer/assets/2067774/be6cd9b9-2c9a-402d-847f-05f860a91df1
</details>
