rust analyzer: Failed to load workspaces after opening stdlib and restarting

[Matt3o12]

Summary

rust analyzer: Failed to load workspaces is shown if I open the stdlib from my project and restart zed.

Description

The error message inside the language server is:

click to expand

2025-05-08T18:55:21.682301094+02:00 ERROR FetchWorkspaceError: rust-analyzer failed to load workspace: Failed to load the project at /home/parallels/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/Cargo.toml: Failed to read Cargo metadata from Cargo.toml file /home/parallels/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/Cargo.toml, Some(Version { major: 1, minor: 86, patch: 0 }): Failed to run `cd "/home/parallels/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std" && RUSTUP_TOOLCHAIN="/home/parallels/.rustup/toolchains/stable-aarch64-unknown-linux-gnu" "/home/parallels/.cargo/bin/cargo" "metadata" "--format-version" "1" "--manifest-path" "/home/parallels/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/Cargo.toml" "--filter-platform" "aarch64-unknown-linux-gnu"`: `cargo metadata` exited with an error: error: failed to parse manifest at `/home/parallels/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/Cargo.toml`

Caused by:
  the cargo feature `public-dependency` requires a nightly version of Cargo, but this is the `stable` channel
  See https://doc.rust-lang.org/book/appendix-07-nightly-rust.html for more information about Rust release channels.
  See https://doc.rust-lang.org/cargo/reference/unstable.html#public-dependency for more information about using this feature.


2025-05-08T18:55:21.857844844+02:00 ERROR FetchWorkspaceError: rust-analyzer failed to load workspace: Failed to load the project at /home/parallels/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/Cargo.toml: Failed to read Cargo metadata from Cargo.toml file /home/parallels/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/Cargo.toml, Some(Version { major: 1, minor: 86, patch: 0 }): Failed to run `cd "/home/parallels/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std" && RUSTUP_TOOLCHAIN="/home/parallels/.rustup/toolchains/stable-aarch64-unknown-linux-gnu" "/home/parallels/.cargo/bin/cargo" "metadata" "--format-version" "1" "--manifest-path" "/home/parallels/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/Cargo.toml" "--filter-platform" "aarch64-unknown-linux-gnu"`: `cargo metadata` exited with an error: error: failed to parse manifest at `/home/parallels/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/Cargo.toml`

Caused by:
  the cargo feature `public-dependency` requires a nightly version of Cargo, but this is the `stable` channel
  See https://doc.rust-lang.org/book/appendix-07-nightly-rust.html for more information about Rust release channels.
  See https://doc.rust-lang.org/cargo/reference/unstable.html#public-dependency for more information about using this feature.

Steps to reproduce:

1. Create a new project
2. Open the stdlib (for example by importing Path and cmd clicking on it)
3. Restart zed
4. See error message:

Expected Behavior: No error Actual Behavior: Error message

This is reproducable on the latest zed version. I noticed it on my mac and to reproduce it, I even installed zed on a fresh fedora vm w/o any modifications to any settings (I only ran installed zed and rustup).

Zed Version and System Specs

Zed System Specs (from CLI): Zed: v0.185.13 (Zed) OS: Linux Wayland fedora 40 Memory: 5.7 GiB Architecture: aarch64 GPU: Failed to run vulkaninfo --summary