src/test/ui/impl-trait/does-not-live-long-enough.stderr

   1 error[E0373]: closure may outlive the current function, but it borrows `prefix`, which is owned by the current function
   2   --> $DIR/does-not-live-long-enough.rs:6:33
   3    |
   4 LL |         self.data.iter().filter(|s| s.starts_with(prefix)).map(|s| s.as_ref())
   5    |                                 ^^^               ------ `prefix` is borrowed here
   6    |                                 |
   7    |                                 may outlive borrowed value `prefix`
   8    |
   9 note: closure is returned here
  10   --> $DIR/does-not-live-long-enough.rs:5:55
  11    |
  12 LL |     fn started_with<'a>(&'a self, prefix: &'a str) -> impl Iterator<Item=&'a str> {
  13    |                                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  14 help: to force the closure to take ownership of `prefix` (and any other referenced variables), use the `move` keyword
  15    |
  16 LL |         self.data.iter().filter(move |s| s.starts_with(prefix)).map(|s| s.as_ref())
  17    |                                 ^^^^^^^^
  18
  19 error: aborting due to previous error
  20
  21 For more information about this error, try `rustc --explain E0373`.