I join these two questions in one, as they maybe are related. A few days ago, I started having this error in the [#actix_rt::main] line, before the main function:
proc macro `main` not expanded: cannot find proc-macro server in sysroot `C:\Users\zerok\.rustup\toolchains\stable-x86_64-pc-windows-gnu`
At the same time, in VSCode my rust-analyzer extension started failing. I uninstalled it, restarted VSCode, and reinstalled. It keeps giving the same error over and over:
Failed to spawn one or more proc-macro servers.
How can I fix this problem?
Soon after posting the question, I finally found out how to install the toolchain, which seems to have fixed both errors:
rustup toolchain install stable-x86_64-pc-windows-gnu
After that, I clicked on the rust-analyzer box on the bottom of VSCode, clicked in "Restart Server", and everything worked after the command completion.