src/doc/book/listings/ch13-functional-features/listing-13-08/output.txt

   1 $ cargo run
   2    Compiling rectangles v0.1.0 (file:///projects/rectangles)
   3 error[E0507]: cannot move out of `value`, a captured variable in an `FnMut` closure
   4   --> src/main.rs:18:30
   5    |
   6 15 |       let value = String::from("by key called");
   7    |           ----- captured outer variable
   8 16 |
   9 17 |       list.sort_by_key(|r| {
  10    |  ______________________-
  11 18 | |         sort_operations.push(value);
  12    | |                              ^^^^^ move occurs because `value` has type `String`, which does not implement the `Copy` trait
  13 19 | |         r.width
  14 20 | |     });
  15    | |_____- captured by this `FnMut` closure
  16
  17 For more information about this error, try `rustc --explain E0507`.
  18 error: could not compile `rectangles` due to previous error