also lint on items after statements in macros

[oli-obk]

This is currently disabled, because it would make e.g. the regex! macro very annoying. Should probably be turned on after regex! has been fixed.

[Ryan1729]

The regex! macro seems to be no more. It's unclear how many other macros would trigger this lint, now though.

Just because I had to edit github urls to find it for context, here's a link to the original lint on items after statements PR

[flip1995]

#![warn(clippy::items_after_statements)]

macro_rules! m {
    () => {{
        f();
        fn f() { println!("Hi"); }
    }};
}

fn main() {
    m!();
}

Does not emit a warning currently: Playground. I don't see a reason, why we shouldn't lint this in local macros.