unsafe(#[attribute]) not working

[kjughx]

I have this code

#[syscalls]
extern "C" {
    pub fn exit(code: i32) -> usize;
}

which fails to compile:

error: unsafe attribute used without unsafe
 --> crates/syscalls/src/lib.rs:9:1
  |
9 | #[syscalls]
  | ^^^^^^^^^^^ usage of unsafe attribute
  |
  = note: this error originates in the attribute macro `syscalls` (in Nightly builds, run with -Z macro-backtrace for more info)
help: wrap the attribute in `unsafe(...)`
  |
9 | unsafe(#[syscalls])
  | +++++++           +

so I try what it says:

unsafe(#[syscalls])
extern "C" {
    pub fn exit(code: i32) -> usize;
}

and get another compilation error:

error: expected item, found keyword `unsafe`
 --> crates/syscalls/src/lib.rs:9:1
  |
9 | unsafe(#[syscalls])
  | ^^^^^^ expected item

Meta

rustc --version --verbose:

rustc 1.92.0-nightly (dd7fda570 2025-09-20)
binary: rustc
commit-hash: dd7fda570040e8a736f7d8bc28ddd1b444aabc82
commit-date: 2025-09-20
host: x86_64-unknown-linux-gnu
release: 1.92.0-nightly
LLVM version: 21.1.1

Backtrace

<backtrace>

[OneProgGit]

You need to write #[unsafe(syscalls)]

[kjughx]

#[unsafe(syscalls)]
extern "C" {
    pub fn exit(code: i32) -> usize;
}

Doesn't work either:

error: unsafe attribute used without unsafe
 --> crates/syscalls/src/lib.rs:9:1
  |
9 | #[unsafe(syscalls)]
  | ^^^^^^^^^^^^^^^^^^^ usage of unsafe attribute
  |
  = note: this error originates in the attribute macro `syscalls` (in Nightly builds, run with -Z macro-backtrace for more info)
help: wrap the attribute in `unsafe(...)`
  |
9 | unsafe(#[unsafe(syscalls)])
  | +++++++                   +

[bjorn3]

The syscalls proc-macro needs to be updated to support the 2024 edition. Which crate did you get it from?

[kjughx]

The syscalls proc-macro needs to be updated to support the 2024 edition.

Even if the consuming crate isn't using 2024 edition?

Which crate did you get it from?

It's my own: https://github.com/kjughx/ruix/tree/master/crates/syscalls

[kjughx]

The syscalls proc-macro needs to be updated to support the 2024 edition

Seems like the issue is what the proc-macro actually generates. It generates code with unsafe attributes. The compilation error message is quite misleading.