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