Diagnostics show "Unknown crate (2)" for even for some of the valid crates

[sarmadgulzar]

Reproduction steps

1. Start a new project

cargo new helloworld

2. Open the project in Zed

zed helloworld

3. Add rust_decimal package

cargo add rust_decimal

4. Open the Cargo.toml file and there'll be yellow squiggly lines under the version number of rust_decimal package. Hovering on it shows this message: rust_decimal: Unknown crate (2)

Current vs. Expected behavior

Current behavior: The diagnostics incorrectly show the "Unknown crate" warning even for valid crates.

Expected behavior: For valid crates, this warning shouldn't be shown.

Zed version and system specs

Zed: v0.217.3+stable.105.80433cb239e868271457ac376673a5f75bc4adb1 (Zed)
OS: macOS 26.2
Memory: 16 GiB
Architecture: aarch64

Attach Zed log file

Zed.log

Relevant Zed settings

settings.json

Relevant Keymap

keymap.json

(for AI issues) Model provider details

No response

If you are using WSL on Windows, what flavor of Linux are you using?

None

[mchisolm0]

Hey @sarmadgulzar, thanks so much for the report. I did have a few questions when you have time since I couldn't repro this on my Mac.

1. Could you open the diagnostics buffer? You can click the yellow triangle or use cmd + shift + m. I thought maybe refreshing the diagnostics might help.
2. Could share your rust/cargo version? You can run rustc --version and cargo --version. I've shown mine below.
3. If you reload the workspace with workspace: reload in the command pallet, do you see the warning still?
4. If you remove rust_decimal and add it back to the project, do you still see the warning?

rustc 1.90.0 (1159e78c4 2025-09-14)
cargo 1.90.0 (840b83a10 2025-07-30)

[SomeoneToIgnore]

The main thing to look here is not the things above, actually, but the source of the diagnostics: Zed itself does not know much about the code, receiving diagnostics from the language servers.

This is either rust-analyzer (which I doubt - IIRC it does not report Cargo.toml crate errors?) or some extension and its language server.

So, if you could provide a list of extensions and which one does this we can check this further.