Rust Anaylyzer bug on FreeBSD 14.3

[achenet]

Hello,

I'm trying to edit some Rust code on FreeBSD 14.3 on a Lenovo ThinkPad with an amd64 processor using the Helix text editor.
I have my editor configured to use rust-analyzer, which I have installed with rustup component install rust-analyzer. The rust-analyzer binary file is installed in ~/.cargo/bin/rust-analyzer.

My rustc version is 1.90, however, when I check the logfile for Helix, found in ~/.cache/helix/helix.log, I see the following error logs:

2025-08-24T10:23:32.410 helix_lsp::transport [ERROR] rust-analyzer err <- "error: Unknown binary 'rust-analyzer' in official toolchain '1.82.0-x86_64-unknown-freebsd'.\n"
2025-08-24T10:23:32.410 helix_lsp::transport [ERROR] rust-analyzer err: <- StreamClosed
2025-08-24T10:23:32.410 helix_lsp [ERROR] failed to initialize language server: server closed the stream
2025-08-24T10:25:09.062 helix_lsp::transport [ERROR] rust-analyzer err <- "error: Unknown binary 'rust-analyzer' in official toolchain '1.82.0-x86_64-unknown-freebsd'.\n"
2025-08-24T10:25:09.063 helix_lsp::transport [ERROR] rust-analyzer err: <- StreamClosed
2025-08-24T10:25:09.063 helix_lsp [ERROR] failed to initialize language server: server closed the stream
2025-08-24T10:28:01.482 helix_lsp::transport [ERROR] rust-analyzer err <- "error: Unknown binary 'rust-analyzer' in official toolchain '1.82.0-x86_64-unknown-freebsd'.\n"
2025-08-24T10:28:01.483 helix_lsp [ERROR] failed to initialize language server: server closed the stream
2025-08-24T10:28:01.483 helix_lsp::transport [ERROR] rust-analyzer err: <- StreamClosed

Maybe there's an issue with the versions?

I tried rustup component remove rust-analyzer followed by rustup component add rust-analyzer, but the problem persists.

There is a rust-analyzer.core file in the project directory, which is a super long file that is binary, so it seems like rust-analyzer might be crashing for some reason?

[ShoyuVanilla]

What happens if you directly execute rust-analyzer like rust-analyzer --version

[achenet]

> rust-analyzer --version
rust-analyzer 1.90.0 (1159e78c 2025-09-14)

[ShoyuVanilla]

Oh, I see the problem. Your system-wide Rust toolchain version is 1.90.0, but your editor's lsp log says that it is trying to find rust-analyzer from toolchain 1.82.0. And it seems that you don't have rust-analyzer with toolchain 1.82.0 (You have rust-toolchain.toml file in your project that pins the version to 1.82.0, I guess?). Rust toolchain components installed in ~/.cargo/bin/rust-analyzer are not actual binaries but some proxy to rustup and rustup tries to locate the actual binary with the matching toolchain version.

So, you might need to..

• Go to your project that helix and rust-analyzer emits the error, then run rustup component add rust-analyzer inside the project's directory, to install it with toolchain version 1.82.0 (But this installs an old version that released with Rust 1.82.0)
• Or install rust-analyzer with whatever mean (package manager is the most convenient but you can just build it from source as well or run cargo install with the source) and locate it to your $PATH, instead of the rustup proxies I've mentioned above

[achenet]

Thanks for your input ^_^

I don't have a rust-toolchain.toml file in the project (or anywhere else, I didn't know they were a thing until just now), however, I did rustup component remove rust-analyzer and then installed from source via

   cd rust-analyzer
   cargo xtask install --server

and I now have rust-analyzer 0.0.0 (2e2e3ebec9 2025-10-31) installed at ~/.cargo/bin/rust-analyzer.

I've tested it again with Helix, it seems to work now, even if I do get the following error logs (which don't seem to inhibit the LSP being useful in the editor).

2025-10-31T16:13:20.315 helix_lsp::transport [ERROR] rust-analyzer err <- "2025-10-31T16:13:20.315659187+01:00  WARN notify error: No such file or directory (os error 2) about [\"/home/ariel/.config/rust-analyzer/rust-analyzer.toml\"]\n"
2025-10-31T16:13:24.033 helix_lsp::transport [ERROR] rust-analyzer err <- "2025-10-31T16:13:24.033676292+01:00  WARN overly long loop turn took 129.174605ms (event handling took 129.160954ms): PrimeCaches(End { cancelled: false })\n"
2025-10-31T16:13:24.033 helix_lsp::transport [ERROR] rust-analyzer err <- "2025-10-31T16:13:24.033694322+01:00 ERROR overly long loop turn took 129.174605ms (event handling took 129.160954ms): PrimeCaches(End { cancelled: false })\n"
2025-10-31T16:13:24.033 helix_lsp::transport [ERROR] rust-analyzer <- ServerError(-32802): server cancelled the request
2025-10-31T16:13:24.033 helix_lsp::transport [ERROR] Tried sending response into a closed channel (id=Num(2)), original request likely timed out