| error[E0515]: cannot return value referencing function parameter `y` | |
| --> $DIR/issue-81584.rs:5:22 | |
| | | |
| LL | .map(|y| y.iter().map(|x| x + 1)) | |
| | -^^^^^^^^^^^^^^^^^^^^^^ | |
| | | | |
| | returns a value referencing data owned by the current function | |
| | `y` is borrowed here | |
| | | |
| = help: use `.collect()` to allocate the iterator | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0515`. |