error[E0597]: `prefix` does not live long enough
  --> $DIR/does-not-live-long-enough.rs:6:51
   |
LL |     fn started_with<'a>(&'a self, prefix: &'a str) -> impl Iterator<Item=&'a str> {
   |                     -- lifetime `'a` defined here     --------------------------- opaque type requires that `prefix` is borrowed for `'a`
LL |         self.data.iter().filter(|s| s.starts_with(prefix)).map(|s| s.as_ref())
   |                                 ---               ^^^^^^ borrowed value does not live long enough
   |                                 |
   |                                 value captured here
LL |
LL |     }
   |     - `prefix` dropped here while still borrowed
   |
help: you can add a bound to the opaque type to make it last less than `'static` and match `'a`
   |
LL |     fn started_with<'a>(&'a self, prefix: &'a str) -> impl Iterator<Item=&'a str> + 'a {
   |                                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0597`.