#[unwind(aborts)] does nothing on extern "Rust" fn

[RalfJung]

I would expect the following code to abort, and never print Hello:

#![feature(unwind_attributes)]

#[unwind(aborts)]
fn foo() { // implicitly: extern "Rust"
    panic!("foooo");
}

fn main() {
    if let Err(_) = std::panic::catch_unwind(|| foo()) {}
    println!("Hello");
}

But instead, the unwind attribute is ignored.

Cc @gnzlbg

[gnzlbg]

That looks like a bug. cc @eddyb @alexcrichton

[eddyb]

extern "Rust" fn is just fn, and having extern "Rust" in the testcase may create the wrong impression (i.e. this bug has nothing to do with FFI).

Still, the attribute should either work and cause an abort or error as unapplicable.

[RalfJung]

I deliberately made it explicit, but sure, I can adjust the example.

[alexcrichton]

Agreed that this just looks like a bug that needs to be fixed.