File: issue-13033.rs

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rustc 1.87.0%2Bdfsg1-1
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trait Foo {
    fn bar(&mut self, other: &mut dyn Foo);
}

struct Baz;

impl Foo for Baz {
    fn bar(&mut self, other: &dyn Foo) {}
    //~^ ERROR method `bar` has an incompatible type for trait
    //~| expected signature `fn(&mut Baz, &mut dyn Foo)`
    //~| found signature `fn(&mut Baz, &dyn Foo)`
}

fn main() {}