proc-macro panicked: called Rust::unwrap() on an Err value: ParseFloatError

[gleich]

Hello rust-analyzer team! First of all, thank you for the work that you do here. I don't wanna waste your time so I'll cut right to the chase. I am getting the error proc macro returned error: proc-macro panicked: called `Result::unwrap()` on an `Err` value: ParseFloatError { kind: Invalid } on the following code:

use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize, Debug)]
pub struct Config {
	pub name: String,
	pub school_level: String,
	pub school_type: String,
}

This error is highlighted on the whole struct as well as the attribute. Below is some more information:

Name of the file: conf.rs.
File link: gleich/kiwi/src/conf.rs
Repo link: https://github.com/gleich/kiwi
Rust version: rustc 1.54.0 (a178d0322 2021-07-26)
RA version: 950efff 2021-08-05 nightly (tried with RA stable)

Because this error is a rust-analyzer problem running cargo check or cargo build doesn't have this error.

[f32by]

Same problem, too.
It works in nightly-2021-08-04-x86_64-apple-darwin rustc 1.56.0-nightly (a6ece5615 2021-08-03) but crashes in nightly-2021-08-05-x86_64-apple-darwin rustc 1.56.0-nightly (25b764849 2021-08-04).

[hex0x0000]

Same error

[bjorn3]

The difference between those rustc version is: rust-lang/rust@a6ece56...25b7648 This is probably caused by rust-lang/rust#87267 which added a new Literal::to_string method to the proc-macro abi.

[bjorn3]

#9550 (comment): @alexjg would you mind updating the proc-macro abi for nightly?

[alexjg]

I'll sort it this weekend

[alexjg]

I'm unable to reproduce this problem with the given repository, toolchain and analyzer versions. Furthermore, all the tests for the proce macro server crate pass in current nightly or in the 2021-08-04 toolchain. Does anyone have a reproducing example I can get a look at? I'm reluctant to make a change without being able to check that it fixes the problem.

It is possible that this only occurs on darwin platforms, I'm running linux so wouldn't be able to test that. Does anyone have access to both platforms to test this hypothesis?

[lnicola]

The test pass, but rust-analyzer analysis-stats . on the RA repo crashes. I'm on Linux, too.

[alexjg]

Ah, that's done the trick, I'll get fixing.