"unexpected token" macro-error on derive macro

[GREsau]

rust-analyzer version: 0.3.2086-standalone (7106cd3be 2024-08-25)

rustc version: rustc 1.80.1 (3f5fd8dd4 2024-08-06)

editor or extension: VSCode, rust-analyzer v0.3.2086 (error does not occur with v0.3.2078)

relevant settings: n/a

repository link (if public, optional): n/a

code snippet to reproduce:
cargo add schemars (reproducible both with stable v0.8.21 and prerelease v1.0.0-alpha.11)

#[derive(schemars::JsonSchema)]
pub struct X;

fn main() {
    println!("{:?}", schemars::schema_for!(X))
}

The code compiles and runs fine. When running cargo expand and using schemars v1.0.0-alpha.11, the derive expands to:

const _: () = {
    #[automatically_derived]
    #[allow(unused_braces)]
    impl schemars::JsonSchema for X {
        fn schema_name() -> schemars::_alloc::borrow::Cow<'static, str> {
            schemars::_alloc::borrow::Cow::Borrowed("X")
        }
        fn schema_id() -> schemars::_alloc::borrow::Cow<'static, str> {
            schemars::_alloc::borrow::Cow::Borrowed("rust_test::X")
        }
        fn json_schema(generator: &mut schemars::SchemaGenerator) -> schemars::Schema {
            generator.subschema_for::<()>()
        }
    }
};

...which rust-analyzer has no problems with.

[rever96]

I got the same problem.
Go back to v0.3.2078 until they will fix the problem

[SenojLuap]

Not sure if it's the same issue, but I get a similar looking error while using rocket's get macro

[ChayimFriedman2]

@rustbot claim

[kerminek]

Not sure if it's the same issue, but I get a similar looking error while using rocket's get macro

Same

[ChayimFriedman2]

@kerminek @SenojLuap The problem is module_path!() not expanding correctly. If rocket's #[get] uses it, it is likely the same problem indeed (you can check by r-a "Expand macro recursively"), do not use cargo-expand because it will expand module_path!() too.

[Spycemyster]

Not sure if it's the same issue, but I get a similar looking error while using rocket's get macro

Switching to rust-analyzer 0.3.2078 fixes it for now (credit to @rever96)