proc macro not found

Question

My main function is decorated with two proc macros like this:

#[paw::main]
#[tokio::main]
pub async fn main(args: Args) -> Result<()>

This compiles and runs as I expect it but VS code's rust-analyzer gives me this error on both lines of attribute macros #[paw::main] and #[tokio::main] . The error message is:

proc macro `main` not expanded: proc macro not found rust-analyzer (unresolved-proc-macro)

Answer 1

There might be a better way, but this will make the error go away:

• Go to settings and find rust-analyzer > Diagnostics: Disabled . You can search for "rust analyzer diagnostics" to find this option.
• Press Add Item
• Add the item unresolved-proc-macro and press OK.

Source for this solution was found here .

Answer 2

Judging by this GitHub issue , and in particular this comment , it seems that proc macro expansion is quite dependent on the version of the Rust compiler. The suggested fix is to keep your rust-analyzer updated. Switching to the pre-release version of rust-analyzer fixed this for me on rustc 1.61, which is the latest stable in time of writing. Presumably the pre-release version of rust-analyzer is always most likely to be ABI-compatible with the latest stable version of rustc.