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`.