error[E0515]: cannot return value referencing local variable `raw_lines` --> $DIR/drop-with-active-borrows-2.rs:3:5 | LL | raw_lines.iter().map(|l| l.trim()).collect() | ---------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | | | returns a value referencing data owned by the current function | `raw_lines` is borrowed here error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0515`.