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Add suggestion `.collect()` for iterators in iterators Closes #81584 ``` error[E0515]: cannot return value referencing function parameter `y` --> main3.rs:4:38 | 4 | ... .map(|y| y.iter().map(|x| x + 1)) | -^^^^^^^^^^^^^^^^^^^^^^ | | | returns a value referencing data owned by the current function | `y` is borrowed here | help: Maybe use `.collect()` to allocate the iterator ``` Added the suggestion: `help: Maybe use `.collect()` to allocate the iterator`