File: mismatched-map-under-self.rs

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rustc 1.88.0%2Bdfsg1-2
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pub trait Insertable {
    type Values;

    fn values(&self) -> Self::Values;
}

impl<T> Insertable for Option<T> {
    type Values = ();

    fn values(self) -> Self::Values {
        //~^ ERROR method `values` has an incompatible type for trait
        self.map(Insertable::values).unwrap_or_default()
        //~^ ERROR type mismatch in function arguments
    }
}

fn main() {}