expandable 0.1.1

What if we could check declarative macros before using them?
Documentation 
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#[allow(unused_macros)]
#[expandable::expr]
macro_rules! r#break {
    ($e:expr) => {
        break $e
    };

    ($e:expr) => {
        break break break break break break break 42
    };

    () => {
        break
    };
}

fn main() {}