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This post is auto-generated from RSS feed The Rust Programming Language Forum - Latest topics. Source: RA in VS Code highlights `#[tokio::main]`as error despite successful compilation with nightly Rust

​​Environment:​​

• Rust toolchain: 1.91.0-nightly (809200ec9 2025-08-24)

• Editor: VS Code (latest stable)

• rust-analyzer: v0.3.2593,

• tokio = { version = "1.47.1", features = ["full"] }

​​Issue:​​

The #[tokio::main]macro is highlighted as an error in VS Code by rust-analyzer(red underline, error hint: "tokio::main: proc macro server error: Cannot create expander for ~\target\debug\deps\tokio_macros-0db0bbc0b2211d25.dll: unsupported metadata version 10"). However, the project compiles and runs successfully via cargo build/runon the same toolchain. This occurs even in minimal async examples:

#[tokio::main]
async fn main() {
    println!("Hello, tokio!");
}

​​Question:​​

Is this a known issue with RA + nightly + Tokio? Are there workarounds beyond suppressing the diagnostic?

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