error[E0515]: cannot return value referencing function parameter --> $DIR/issue-26619.rs:5:76 | LL | for s in vec!["1|2".to_string()].into_iter().filter_map(|ref line| self.make_entry(line)) { | -------- ^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function | | | function parameter borrowed here error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0515`.