Integration tests running cargo clean fail intermittently with rust-analyzer in VS Code

Integration tests that run cargo clean are reported to fail intermittently when rust-analyzer is enabled inside Visual Studio Code, according to a reproducible report filed as rust-analyzer issue #21656. The report, authored by zhiqiangxu with discussion from project member lnicola on Nov 23, 2023, includes tooling details for cargo, cargo check, cargo build, cargo-analyzer and the rust-analyzer LSP, and notes that the failures sometimes clear after manual cleaning before returning later.

Issue author zhiqiangxu described the behavior in several edited comments on Nov 23, 2023, noting that VS Code "takes quite some time to enable code navigation even though `cargo build` is already done." They observed that "The error is gone this time, after doing `cargo clean`" while also reporting "But code navigation is still disabled. (`cmd+click` goes nowhere.)" and later that "After waiting some more time, the error comes out again(though different from the initial errors):" — indicating intermittent symptoms that include both error messages and disabled cmd+click navigation.

Project member lnicola replied the same day with clarifications and diagnostic suggestions, stating "It doesn't, unless it says in the status bar it's building stuff." to explain that code navigation is not necessarily tied to a completed cargo build. lnicola recommended adjusting the language server check behavior: "You might want to disable `rust-analyzer.check.allTargets` to make it match `cargo check` in the terminal (but don't forget to actually run it from the terminal as said above)." They also noted environment effects, saying "Build scripts fail to run for whatever reason, but yes, navigation works" and "You have a lot of code, it takes a bit to load."

Community troubleshooting posted under a Users Rust-lang block supplies concrete reproduction and mitigation steps. Contributors advised running cargo check all-targets with an intentional mistake to confirm cargo tracks files, then to match rust-analyzer settings to the terminal workflow by adding to your_project/.vscode/settings.json the entries "rust-analyzer.cargo.autoreload": true, "rust-analyzer.procMacro.enable": true, "rust-analyzer.checkOnSave.command": "clippy", and "rust-analyzer.cargo.loadOutDirsFromCheck": true, then restarting the LSP by closing and reopening VS Code. If configuration changes fail, the community suggests clearing caches with rm -rf ~/.cargo/registry, rm -rf ~/.rust-analyzer and rm -rf you_project/target, noting "It will take a while when you'll reopen vscode, but it may fix the bug if this is a cache error."

A specific manifest-level suspicion in the thread targets an absolute path in a test package entry. The problematic snippet shown in the discussion is name = "integ_tests", path = "/tests/initialize.rs", test = true; contributors recommended changing it to name = "integ_tests", path = "tests/initialize.rs", test = true and reminded reporters that "By the way, all the `.rs` files on the `tests` directory are considered as tests, so it should work without the `` section."

The thread also records a known limitation of rust-analyzer analysis: "Our analysis isn't perfect and we'll sometimes pick up the wrong trait (like `Header`), which can cause errors like that (since `Header::hash` only takes `&self`). Usually type annotations fix them." That quote anchors the hypothesis that imperfect trait selection plus mismatched cargo state can generate spurious errors in large codebases.

What remains explicit in the issue is that the report includes a reproducible case and exact tools and settings to test, but the thread excerpts do not contain the original error strings or a confirmed root cause or patch. Practical next steps from the thread are to run cargo check all-targets, align rust-analyzer settings in your_project/.vscode/settings.json, try the relative tests/initialize.rs path, clear ~/.cargo/registry and ~/.rust-analyzer caches, and restart VS Code; the issue discussion on Nov 23, 2023 leaves the intermittent failure unresolved in that thread.