File: param-without-lifetime-constraint.rs

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struct Article {
    proof_reader: ProofReader,
}

struct ProofReader {
    name: String,
}

pub trait HaveRelationship<To> {
    fn get_relation(&self) -> To;
}

impl HaveRelationship<&ProofReader> for Article {
    fn get_relation(&self) -> &ProofReader {
    //~^ ERROR `impl` item signature doesn't match `trait` item signature
        &self.proof_reader
    }
}

fn main() {}