RA picking stable v nightly errors in dependencies

[kubkon]

Apologies if this is a duplicate, but I couldn't find a matching issue.

Description:

I'm not sure whether this is as intended, but I'm currently seeing a lot of errors of this type:

/Users/kubkon/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/dynasm-0.5.2/src/lib.rs:1:1 Error [rustc E0554] `#![feature]` may not be used on the stable release channel

For the record, with RLS I've actually never experienced this problem.

Setup:

Some setup info:

• NeoVim + neoclide
• RA with nightly updates

Oh, and here's the repo I've experienced this in: wasmtime.

cc @bjorn3 are you seeing this as well by any chance?

[kubkon]

Oh, and I should probably add that often these are the only errors I see, which hide other, actual errors in the crate(s).

[bjorn3]

I haven't ever seen this. How did you switch to the nightly channel? Did you use rustup override, the rust-toolchain file or something else? I currently use rust-toolchain, but back when I used rustup override, I don't think I have seen it either.

[kubkon]

That's the thing, I'm working exclusively on stable channel.

[bjorn3]

Did you enable allFeatures? The lightbeam feature of wasmtime requires nightly.

[kubkon]

Ah, lightbeam, of course! So turning allFeatures off almost did it, thanks! I'm still seeing the same error for staticvec though, which is weird given that it should only be pulled by lightbeam, and with allFeatures set to false, I'm not sure why it ends up in the error list. 🤷

[matklad]

Not sure what's the exact issue here, but it looks like something activates all/default features, which seems unrelated to rust-analyzer.

[bjorn3]

I think this is because of the --workspace that rust analyzer automatically passes. It worked fine for me with "rust-analyzer.checkOnSave.overrideCommand": ["cargo", "check", "--message-format=json", "-p", "wasmtime"].

[kubkon]

I can confirm that @bjorn3's suggested solution worked. @matklad question though, is that then the intended behaviour?

[matklad]

That's intended behavior from rust-analyzer side, but it can be considered a bug ("the" bug) in Cargo. It's being worked on in rust-lang/cargo#7820

[kubkon]

Ah cool, makes sense! Thanks for the link!