How to pick lib.rs as the entry point instead of main.rs

[ospfranco]

I have a crate that is a bit funky. It sits in a workspace. The main use case is to use it as a library, therefore it has a lib.rs. But because we needed to write some unit tests, we decided to also enable a CLI-esque functionality via adding a main.rs. The problem now is that the main.rs exists, rust-analyzer thinks main.rs has priority over lib.rs and there is a lot of unused code errors showing. Is there anyway to tell rust analyzer to compile the lib (--lib in normal cargo) version. I'm using vscode and I've tried this:

{
  "rust-analyzer.cargo.target": "aarch64-apple-ios",
  "rust-analyzer.cargo.features": "all",
  "rust-analyzer.cargo.buildScripts.enable": true,
  "rust-analyzer.cargo.extraArgs": ["--lib"],
}

But it doesn't work. The only other option seems to be the override command but that is a pretty blunt solution.

Edit 1

I just checked the default command

cargo check --quiet --workspace --message-format=json --all-targets --keep-going

And it indeed just checks the main.rs, even if I add --lib. So it seems this might be a problem with cargo ignoring --lib when --workspace is present?

Edit 2

I've tried to override the command used by rust-analyzer:

  "rust-analyzer.check.overrideCommand": [
    "cargo",
    "check",
    "--quiet",
    "--workspace",
    "--lib",
    "--all-features",
    "-message-format=json",
    "--all-targets",
    "--keep-going"
  ],

Though this seemed to work at first (giving inlay type hints) I later realized that it does not report the errors. So this approach also does not work.

[ChayimFriedman2]

--all-targets should instruct Cargo to check both main.rs and lib.rs. I just checked and this is indeed the case. Perhaps there is something weird with your configuration - what is your Cargo.toml(s)?

[ospfranco]

The workspace is defined with

[workspace]
resolver = "3"
members = ["sdk", "ra-verify"]

The sdk is the main member I care about, the one that has main.rs and lib.rs but I only want to check the types for lib.rs

[package]
name = "sdk"
version = "0.0.0"
edition = "2024"

[features]
default = []
cli = []

[lib]
crate-type = ["staticlib"]

[ChayimFriedman2]

Can you post a full reproduction repository?

[ospfranco]

Yeah, here is a simple example that emulates the real problem I'm having

https://github.com/ospfranco/libmain_repro

If you run cargo test --lib it works correctly. But on VSCode you see this

This error would be correct if the main.rs would be the only entry point of the program, but I don't care about main.rs, I want to give priority to lib.rs

[ospfranco]

I still cannot get rust-analyzer (or rather cargo) to behave properly. I've resorted to complete the modules in main.rs and adding #[allow(dead_code)] and other directives to turn off unused errors.