Support should_panic for rune tests

[Roba1993]

Allow should panic flag for rune test functions like this:

#[test]
#[should_panic]
pub fn test() {
    let object = #{ field: 1 };
    let object2 = object;
    println!("field: {}", object.field);
    // move the variable into the drop function and consume it
    drop(object2);
    // This will fail
    println!("field: {}", object.field);
}

[udoprog]

This is already supported for doc tests btw.

[Roba1993]

This is already supported for doc tests btw.

Yeah I have seen that. My problem is for our documentation with Zola (non API documentation) I load scripts from a file. This allows me to test them and use them in the documentation in parallel.
See an example here: Exolynk Documentation

For that I need to explain the should_panic within the rune script itself.

[udoprog]

Yeah, totally understandable. This should be fairly easy to add since the infrastructure is mostly already in place. We just need to parse the attribute and propagate it out with how the test functions are collected.