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error[E0053]: method `next` has an incompatible type for trait
--> $DIR/issue-21332.rs:5:27
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LL | fn next(&mut self) -> Result<i32, i32> { Ok(7) }
| ^^^^^^^^^^^^^^^^
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| expected enum `Option`, found enum `Result`
| help: change the output type to match the trait: `Option<i32>`
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= note: expected fn pointer `fn(&mut S) -> Option<i32>`
found fn pointer `fn(&mut S) -> Result<i32, i32>`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0053`.
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