| error[E0053]: method `next` has an incompatible type for trait |
| --> $DIR/issue-21332.rs:5:27 |
| | |
| LL | fn next(&mut self) -> Result<i32, i32> { Ok(7) } |
| | ^^^^^^^^^^^^^^^^ expected `Option<i32>`, found `Result<i32, i32>` |
| | |
| = note: expected signature `fn(&mut S) -> Option<i32>` |
| found signature `fn(&mut S) -> Result<i32, i32>` |
| help: change the output type to match the trait |
| | |
| LL | fn next(&mut self) -> Option<i32> { Ok(7) } |
| | ~~~~~~~~~~~ |
| |
| error: aborting due to 1 previous error |
| |
| For more information about this error, try `rustc --explain E0053`. |
