Can't expand any proc macros in current nightly: Failed to expand the macro: a procedural macro error occurred:

[ForsakenHarmony]

Environment

• IntelliJ Rust plugin version: 0.4.175.4741-222-nightly
• Rust toolchain version: 1.64.0-nightly (c396bb3b8 2022-07-10) x86_64-pc-windows-msvc
• IDE name and version: CLion 2022.2 EAP (CL-222.3345.16)
• Operating system: Windows 10 10.0
• Macro expansion engine: new
• Name resolution engine: new
• Additional experimental features: org.rust.cargo.features.settings.gutter, org.rust.cargo.emulate.terminal, org.rust.cargo.evaluate.build.scripts, org.rust.macros.proc

Problem description

intellij-rust doesn't expand any macros, doesn't matter which project or which crates contain the macros (e.g. serde::Serialize)

I get the error message Failed to expand the macro: a procedural macro error occurred: (nothing after the colon)

Steps to reproduce

use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Test {
	pub id:    u64,
	pub name:  String,
}

[ForsakenHarmony]

Still happening with 0.4.175.4744-222-nightly

[ForsakenHarmony]

It works with an older version of rust (I have nightly-2022-04-12 installed)

[ForsakenHarmony]

Just tried going back to rust 1.63.0-nightly (nightly-2022-06-25), but it still fails

[ForsakenHarmony]

Just debugged the extension, and it seems the error that comes back from the native helper is just "<unknown error>"

[ForsakenHarmony]

May be related to rust-lang/rust-analyzer#12600

[vlad20012]

Breakdowns of proc macros on the nightly Rust are absolutely usual, unfortunately. We even going to specially detect them and show more informative messages (see #8930). More robust solutions are discussed here.

You can use stable Rust or try to find a nightly version that works.
This specific issue will be fixed by #9058