How can I remove type annotation help when using rust-analyzer?

Question

For VS Code, I use rust-analyzer to handle syntax highlighting and flychecking.

How do I remove the inlay type and parameter annotations in grey below?

I wish rust analyzer turned off inlay annotations by default. While they're great for people who want them, using them by default adds unnecessary noise to the language. An important benefit of strong type inference like Rust's is that you don't have to clutter the code with annotations. While the code is technically not cluttered here (the annotations are just added by the IDE), visually the result is as if they are. — user4815162342
– user4815162342, Commented Nov 10, 2021 at 12:11
While I agree about the default setting, I personally favor the Microsoft style guide which says that all declarations should be explicitly type annotated, except for calls to a constructor. My main problem with rust-analyzer was the mess that the "inlays" made to my line lengths, which is normally strictly enforced by my auto formatter. I might be in the minority about explicit type annotations though. — Thorkil Værge
– Thorkil Værge, Commented Nov 10, 2021 at 12:17
@user4815162342 An important benefit of strong type inference like Rust's is that you don't have to clutter the code with annotations. I still want to see the inferred type of an expression (especially when I'm not sure what type a function returns), I just don't want to have to type it out myself. — BallpointBen
– BallpointBen, Commented Nov 10, 2021 at 15:13

Vincent Tjeng · Accepted Answer · 2023-07-17 10:02:01Z

142

Update Sept 2022.

They now use VSCode builtin inlay function from 1.67

I setup mine as follow:

{
  "editor.inlayHints.enabled": "offUnlessPressed"
}

Then you can toggle them with Ctrl+Alt pressed.

Old Answer

There is now a togglable command (Ctrl+Shift+P) : Rust Analyzer: Toggle inlay hints

edited Jul 17, 2023 at 10:02

Vincent Tjeng

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answered May 22, 2022 at 14:08

melMass

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2 Comments

Pavel Šimerda Over a year ago

Ctrl+Alt seems to also activate the menu, though, which is obnoxious.

Nils Werner Over a year ago

To prevent activating the menu, make sure to press Alt first, and Ctrl second.

MindSwipe · Accepted Answer · 2023-11-30 21:19:53Z

61

New Answer for VS Code: https://stackoverflow.com/a/72338341/9363973

If you're not using VS Code you'll need to manually edit the JSON config file of your rust-analyzer install (helpful link to the documentation). Basically

Open the JSON config file in your favourite text editor
Add a new property to the root of the JSON object like so:

{
    "inlayHints": {
        "typeHints": false,
        "parameterHints": false
    },
    // further configuration
}

Old answer for VS Code:

In Visual Studio Code you can easily do this.

Open the settings page (Ctrl+,)
Search for "rust-analyzer inlay"
Uncheck things you don't want
- In your case that would be "Parameter Hints" and "Type Hints"

edited Nov 30, 2023 at 21:19

answered Nov 10, 2021 at 9:23

MindSwipe

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