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[SOLVED] Rust-analyzer only somewhat working? (lemmy.blahaj.zone)

submitted 5 months ago* (last edited 5 months ago) by [email protected] to c/[email protected]

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The autocompletion works (mostly) but for example Vec::new() doesn't highlight anything at all. I do get errors when not putting a semicolon, but things like passing too many arguments into the println macro doesn't throw an error. Or how shown in this example, it did not autocomplete the clone method, while also just accepting .clo; at the end of a String (it also didn't autocomplete "String"). In the video I show how it also gives me a recommendation for setting vec![] as a type, which doesn't make any sense. It only seems to a very limited selection of methods and some words I already used in the script. Is this how it's supposed to be, or do I have some very old version perhaps?

EDIT: Look in description for the fix

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[–] [email protected] 2 points 5 months ago (1 children)

That's not how it's supposed to be.

but for example Vec::new() doesn’t highlight anything at all.

If I do Vec::new(foo, bar), I get expected 0 arguments, found 2 (rust-analyzer E0107).

but things like passing too many arguments into the println macro doesn’t throw an error.

I don't get that either, but I'm still running with the Vim configuration I setup on my previous PC from 2011, where I turned off checks that require calling cargo check or cargo clippy in the background. From what I remember, a properly functioning default rust-analyzer config should pick up and display anything cargo check will catch and you can switch it to cargo clippy for even stricter results.

Or how shown in this example, it did not autocomplete the clone method, while also just accepting .clo; at the end of a String (it also didn’t autocomplete “String”).

I get clone(), clone_into(), and clone_from() as proposed completions for .clo on my as-you-type completions for foo where let foo = String::new(); and it proposed a whole bunch of things, with String at the top when I typed Stri. (eg. the stringify! macro, OsString, mixed in with various results from other crates in the project like serde)

[–] [email protected] 3 points 5 months ago (1 children)

Turns out, the *.rs file needs to be in some kind of folder structure, like the one provided by cargo when creating a project. I was just editing the loose files in the rustlings program, and because they are not in a proper program folder structure, most of the syntax stuff didn't show up.

Thank you for sharing your experience though! It was very useful for figuring out if what I had was an issue or normal behavior. Now my neovim works perfectly with all the syntax highlighting I could wish for.

[–] [email protected] 2 points 5 months ago

Ahh, yeah. In the beginning, Rust was built around the idea that individual files and invoking rustc are internal details, only relevant for integration into some other build system like Bazel, and that "normal" Rust projects need to be inside a Cargo project structure.

There is in-development work to have official support for something along the lines of rust-script, but it's still just that... in development. If you want to keep an eye on it, here is the tracking issue.