How to use this extension?

[dbeckwith]

I installed this extension because I thought the default Rust syntax highlighting was lacking in VS Code, but I can't figure out how to get VS Code to use it. I also have the official rust-analyzer extension installed, and I saw #1, but I'm confused as to how to change the grammar association for Rust. I tried disabling the VS Code builtin Rust syntax extension, but now Rust files have no highlighting at all. Any ideas?

[dustypomerleau]

Hi, @dbeckwith. If you have enabled Rust Analyzer, then you don't need this extension. My grammar is merged into Rust Analyzer, and RA's grammar overrides others when it starts. However, you won't see highlighting based on Textmate scopes unless you have semantic highlighting disabled in VS Code.

[dbeckwith]

Hmm okay, could it just be an issue with my theme then? It seems like most things are colored yellow in my theme and there isn't enough variation. I'm using the Cobalt2 theme.

[dustypomerleau]

The Textmate grammar only provides the scopes. If you don't like the color applied to one of the tokens, you can override it in settings.json. It just happens that your theme is using the same color for storage, entity.name..., and function. You can see the scope names for customization using Developer: Inspect Editor Tokens And Scopes.

[dbeckwith]

Okay thanks, I'll try customizing it. Do you have an example theme that assigns different colors to the different scopes that I could try to verify that it's working? Like the one in the screenshot in the README?

[dustypomerleau]

My Yarra Valley theme should work. There is a screenshot of Rust code in the README.

[dbeckwith]

Thanks!

With your theme I think I was able to find a parsing bug haha. The macro metavariable type path looks like it's being parsed as pat:

[dustypomerleau]

Thanks for catching that—I have pushed a fix.