Enabled unstable feature marked as en error

[krojew]

Environment

• IntelliJ Rust plugin version: 0.2.125.3191-201
• Rust toolchain version: 1.46 nightly
• IDE name and version: CLion 2020.1
• Operating system: Windows 10

Problem description

Enabled unstable features are still underlined in red with X is unstable [E0658] error.

Steps to reproduce

Enable an unstable feature, e.g. #![feature(total_cmp)] and compare two f32:

let o = 1f32.total_cmp(&2f32);

[Undin]

@krojew Could you provide an exact code example?
I can't reproduce it for the following code:

#![feature(total_cmp)]

fn main() {
    let o = 1f32.total_cmp(&2f32);
}

[krojew]

Managed to replicate with trivial lib crate:

[cwfitzgerald]

Most experimental features I use are marked this way by CLion, and it's quite annoying. While a full fix would be preferred of course, in the interim, if some way to disable this specific check was added, it would allow time for this to be properly fixed.