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