rust-analyzer can't find sysroot for rustlings (only)

[crochethk]

• rustc --version:

  rustc 1.78.0 (9b00956e5 2024-04-29)

• rustlings --version:

  rustlings 5.6.1

• OS info:

  • Edition: Windows 10 Pro
  • Version:22H2
  • Build: 19045.4412

While using rust-analyzer with vscode and the rustlings project on a windows machine I get the following warning from rust-analyzer:

Failed spawning proc-macro server for workspace D:\my\path\to\rustlings\rust-project.json: no sysroot

I don't know if it matters, in terms of reproducing the issue, but I'm using a custom directory for rustlings and have it opened along with other rust-projects in the same vscode workspace.

I tried my best to look for a misconfiguration, reinstalled rustup and rustlings as per recommendation but it did not resolve it.

Finally I was able to fix it by adding the toolchain-path as sysroot property into the generated rust-project.json, as follows:

{
    "sysroot_src": "C:\\Users\\crochethk\\.rustup\\toolchains\\stable-x86_64-pc-windows-msvc\\lib\\rustlib\\src\\rust\\library",
    "sysroot": "C:\\Users\\crochethk\\.rustup\\toolchains\\stable-x86_64-pc-windows-msvc", // <----- manually added line
    "crates": [
        {
            "root_module": "exercises\\clippy\\clippy1.rs",
            "edition": "2021",
            "deps": [],
            "cfg": [
                "test"
            ]
        },
        //...
        {
            "root_module": "exercises\\vecs\\vecs2.rs",
            "edition": "2021",
            "deps": [],
            "cfg": [
                "test"
            ]
        }
    ]
}

So my suggestion is to include the sysroot in the generated rust-project.json file.

[mo8it]

Sorry for the inconvenience. This should be solved in the upcoming version 6 since it uses Cargo instead of project.json.