thread_local!() can't take attributes

[Manishearth]

#![deny(unsafe_code)]

thread_local!(static KEY: u8 = 1);

fn main() {
}

will hit an unsafe_code warning due to an unsafe function internally defined in the thread local macro (the unsafe function is a recent addition). There's no way to allow() it.

The macro should take in attributes.

[Stebalien]

The correct fix for this specific bug is to annotate __gettit with #[allow(unsafe_code)]. Are there any other use cases for passing attributes through?

[sfackler]

dead_code possibly.

[nodakai]

For now, we can artificially add an inner module:

#![deny(unsafe_code)]

mod inner {
#![allow(unsafe_code)]
thread_local!(pub static KEY: u8 = 1);
}
use inner::KEY;

fn main() {
    KEY.with(|x| { x == &0u8 });
}