Question

I m trying to learn Rust and installed the Rust extension for VSCode. But I m not seeing auto-completions for any syntax.

I d like to call .trim() on String but I get no completion for it. I read that the completion for Rust isn t great, but the Language Server should be able to recommend methods that can be called on a struct?

I also saw a tutorial where the tutor had autocompletion in VSCode but I don t know what extension he was using.

I also tried it in WSL and thought that WSL was the problem, but after also installing Gigabytes of Visual Studio Build Tools it turns out it s also not working natively on Windows.

Answer 1

As mentioned in dustypomerleau/rust-syntax issue 4, since Nov. 2020, the grammar is merged into Rust Analyzer, and RA s grammar overrides others when it starts.

The completion should improve, and the microsoft/vscode issue 64488 "Need a better grammar support for Rust lang" just got closed (Dec. 2020) as a result.

Answer 2

For me solution was to use Rust Analyzer extension https://marketplace.visualstudio.com/items?itemName=matklad.rust-analyzer instead of https://marketplace.visualstudio.com/items?itemName=rust-lang.rust

Answer 3

None of the above answers worked for me.

After a lot of trials, below is what worked. I tested it for 2weeks and then wrote it here.

created a new workspace with only this one rust project in it.
installed only this rust extension: https://marketplace.visualstudio.com/items?itemName=rust-lang.rust-analyzer

now code completion is working in every file.

[edit1] After a few months of usage if rust code completion is not working then...

close the vs code
go to the dir where the rust code is written
delete cargo.lock .vscode folders
open vs code > new window > and reimport the project.

Answer 4

I just had the same issue despite using the rust-analyzer extension. Somehow, the Cargo.toml of my current project was not linked to rust-analyzer s linked projects.

To link it, the path of the Cargo.toml must appear in {project_root}/.vscode/settings.json as an argument to rust-analyzer.linkedProjects. Here is how this looks like now in my case:

{
    "rust-analyzer.linkedProjects": [
        "./py-kernel-regression/Cargo.toml",
        "./Cargo.toml",
    ]
}

Answer 5

One more thing, if your file is not added to mod.rs VSCode will fail to recognize as a project file, and hence the autocomplete suggestions may not work.

Or in main.rs your module is not listed at the top:

mod file_model;
mod utils;
// add relevant module or file

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