File: issue-21332.rs

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rustc 1.85.0%2Bdfsg3-1
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struct S;

impl Iterator for S {
    type Item = i32;
    fn next(&mut self) -> Result<i32, i32> { Ok(7) }
    //~^ ERROR method `next` has an incompatible type for trait
    //~| expected `Option<i32>`, found `Result<i32, i32>`
}

fn main() {}