rustactix-webrust-analyzer

Error: proc macro `main` not expanded: Cannot create expander for

I want to run a web server with Rust and Actix-Web. After following these steps of their documentation everything works as expected: the server runs on port 8080.

The problem I have is that VSCode shows errors

Screenshot from VSCode with errors

This error message is shown in the tooltip upon hovering the error in the IDE

proc macro main not expanded: Cannot create expander for /Users/name/Documents/projects/project-rust/target/debug/deps/libactix_web_codegen-b262af45f63000f3.dylib: Io(Custom { kind: InvalidData, error: DlOpen { desc: "dlopen(/Users/name/Documents/projects/project-rust/target/debug/deps/libactix_web_codegen-b262af45f63000f3.dylib, 0x000A): tried: '/Users/name/Documents/projects/project-rust/target/debug/deps/libactix_web_codegen-b262af45f63000f3.dylib' (mach-o file, but is an incompatible architecture (have 'arm64', need 'x86_64')), '/usr/local/lib/libactix_web_codegen-b262af45f63000f3.dylib' (no such file), '/usr/lib/libactix_web_codegen-b262af45f63000f3.dylib' (no such file)" } })

Environemnt - macOS Monterey 12.1 (M1)

Solution

  • VS Code

    Thanks, @Smitop for the tip

    I reinstalled VSCode with universal build and the errors are gone

    enter image description here

    P.S. I tried to install the build for Apple Silicon, but it didn't help

    NVIM (macOS, arm64, m1)

    For those experiencing the same issue in NeoVim, the following steps helped resolve the errors.

    1. Open a terminal
    2. Execute rustup toolchain list

    It should print

    stable-aarch64-apple-darwin (default)
stable-x86_64-apple-darwin
    1. Copy the stable-x86_64-apple-darwin and make it default, by using rustup default stable-x86_64-apple-darwin
    2. Re-open NeoVim.
    3. Errors should disappear