cfg_attr falsely evaluated?

[9SMTM6]

I may be a bit out of my dept, this is my interpretation.

But to me it seems like RA doesnt handle cfg_attr correctly, specifically I'm getting errors about using a nightly feature (the feature flag attribute:-)) in RA, when running cargo build doesnt fail.

I was able to observe this on Windows, with both the 1.63 and 1.62 toolchain, specifically when trying out uniffi_build.

It is reproducible just by following the tutorial until you use uniffi_build, and I get an error from the transitive anyhow dependency in the RA LSP log from VSCode:

[ERROR rust_analyzer::lsp_utils] failed to run build scripts

error[E0554]: `#![feature]` may not be used on the stable release channel
   --> C:\Users\<USER>\.cargo\registry\src\github.com-1ecc6299db9ec823\anyhow-1.0.61\src\lib.rs:214:32
    |
214 | #![cfg_attr(backtrace, feature(backtrace))]
    |                                ^^^^^^^^^

From my cursory browsing the backtrace feature should not be enabled in anyhow, it should be disabled by default and uniffi_build doesnt enable it.

As I said, running cargo build runs the build-script just fine.

rust-analyzer version: 0.3.1162-standalone (634cfe3 2022-08-07)

rustc version: both 1.63 and 1.62 tested

relevant settings: -

[bjorn3]

Fixed by #13010, which will be in the release tomorrow. You will need to do a cargo clean once to erase the corrupt state that rust-analyzer before this PR caused.

[9SMTM6]

ah, i did search for connected issues, but did not connect these.

I will reopen should this not clear things up, thanks!