src/tools/rustfmt/tests/source/dyn_trait.rs

#![feature(dyn_trait)]

fn main() {
    // #2506
    // checks rustfmt doesn't remove dyn
    trait MyTrait {
        fn method(&self) -> u64;
    }
    fn f1(a: Box<dyn MyTrait>) {}

    // checks if line wrap works correctly
    trait Very_______________________Long__________________Name_______________________________Trait {
        fn method(&self) -> u64;
    }

    fn f2(a: Box<dyn Very_______________________Long__________________Name____________________Trait+ 'static,>) {}

    // #2582
    let _: &dyn (::std::any::Any) = &msg;
}