`global_asm!` proc macro is not resolved

[budde25]

global_asm! proc macro throws there error that it is an unresolved-macro-call
Error: "unresolved macro self::global_asm! rust-analyzer(unresolved-macro-call)"

this does compile output of cargo check:

cargo check
    Finished dev [unoptimized + debuginfo] target(s) in 0.04s

Also not sure if it is relevant but I also have #![no_std]

[jonas-schievink]

What Rust version are you using? This works fine for me. Can you provide the full source code needed to reproduce this?

[budde25]

rustc 1.55.0-nightly (67b03007c 2021-07-23)
rust-analyzer INFO [7/24/2021, 8:57:52 AM]: Extension version: 0.2.678

That is interesting because it has been broken for me since I have been working on this project about 6 months ago, across different computers. I wonder if it has something to do with my project setup. The repo is https://github.com/budde25/os, the relevant code is in lib.rs.

[Andy-Python-Programmer]

I am experiencing the same bug.

rustc version: rustc 1.56.0-nightly (d9aa28767 2021-07-24)
rust analyzer version: v0.2.678

For me it has recently broken after the proc macro bug is fixed.

[Bobo1239]

Bisected the issue to rust-lang/rust#87227 (included since nightly-2021-07-20) which probably makes sense. Don't have time to look into the rust-analyzer side but hope this helps.

[jonas-schievink]

Repro:

//- /lib.rs crate:lib deps:std
global_asm!();

//- /std.rs crate:std
pub mod prelude {
    pub mod rust_2018 {
        pub macro global_asm() {
            pub struct S;
        }
    }
}

This doesn't resolve, because we first check for global_asm! in the legacy scope, and then rewrite its path as self::global_asm. However, self::global_asm never resolves in the prelude.

This issue ties in with existing bugs around macro resolution described in #8828 (comment)

[jonas-schievink]

fixed by #9700

[budde25]

Thank you!