Prelude is not resolved after toolchain override

I noticed that the general name resolution is broken when there are too many changes (for example when rebasing and moving around in history a lot) and I had to delete the contents of lib.rs to fix the issue. Now the prelude is not resolved, which is making it very hard to work even after trying to disable then re-enable the Rust Plugin.

Environment

• IntelliJ Rust plugin version: 0.2.115.2157-193
• Rust toolchain version: 1.40
• IDE name and version: PyCharm 2019.3 (#PY-193.5233.109)
• Operating system: Linux 5.4.0-3-amd6

Steps to reproduce

I’m not sure when it started.

If you want the state I’m in:

hg clone https://foss.heptapod.net/octobus/mercurial-devel
hg up b561fdbcc60
cd rust/hg-cpython/
cargo c (to make sure that it compiles)

EDIT: it seems that the real issue is setting a toolchain override with rustup. It confuses the plugin.

[Alphare]

Another, less brutal solution is to use rustup which cargo inside the folder with the local override and use the bin/ folder where this toolchain’s cargo is located as the toolchain location, and lib/rustlib/src/rust/src as the stdlib location.

That way you can still have the default version be whatever you want, but this is a bit cumbersome.

[Alphare]

For those using relatively recent versions of Rust (this comment was prompted by Debian stable’s upgrade to 1.41.1), you need to install the rust-src component in your rustup toolchain to have the src folder in rustlib.

rustup component add rust-src, then (re)install your toolchain.