error[E0507]: cannot move out of borrowed content
  --> $DIR/issue-2590.rs:22:9
   |
LL |         self.tokens //~ ERROR cannot move out of borrowed content
   |         ^^^^^^^^^^^ cannot move out of borrowed content

error[E0507]: cannot move out of `self.tokens` which is behind a `&` reference
  --> $DIR/issue-2590.rs:22:9
   |
LL |     fn parse(&self) -> Vec<isize> {
   |              ----- help: consider changing this to be a mutable reference: `&mut self`
LL |         self.tokens //~ ERROR cannot move out of borrowed content
   |         ^^^^^^^^^^^
   |         |
   |         cannot move out of `self.tokens` which is behind a `&` reference
   |         `self` is a `&` reference, so the data it refers to cannot be moved

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0507`.