Unsafe attributes not allowed

[bjorn3]

Summary

While all attributes made unsafe in the 2024 edition can be used without unsafe in prior editions, rustc still accepts the unsafe marking on older editions.

Reproducer

I tried this code:

#[unsafe(no_mangle)]
fn foo() {}

Does the code make use of any (1.49) nightly feature ?

• Nightly

Godbolt link

No response

Actual behavior

An error is emitted.

Expected behavior

Compiles successfully on all editions.

GCC Version

gccrs (Compiler-Explorer-Build-gcc--binutils-2.44) 15.2.0