src/doc/book/listings/ch16-fearless-concurrency/listing-16-14/output.txt

   1 $ cargo run
   2    Compiling shared-state v0.1.0 (file:///projects/shared-state)
   3 error[E0277]: `Rc<Mutex<i32>>` cannot be sent between threads safely
   4    --> src/main.rs:11:22
   5     |
   6 11  |           let handle = thread::spawn(move || {
   7     |  ______________________^^^^^^^^^^^^^_-
   8     | |                      |
   9     | |                      `Rc<Mutex<i32>>` cannot be sent between threads safely
  10 12  | |             let mut num = counter.lock().unwrap();
  11 13  | |
  12 14  | |             *num += 1;
  13 15  | |         });
  14     | |_________- within this `[closure@src/main.rs:11:36: 15:10]`
  15     |
  16     = help: within `[closure@src/main.rs:11:36: 15:10]`, the trait `Send` is not implemented for `Rc<Mutex<i32>>`
  17     = note: required because it appears within the type `[closure@src/main.rs:11:36: 15:10]`
  18
  19 error: aborting due to previous error
  20
  21 For more information about this error, try `rustc --explain E0277`.
  22 error: could not compile `shared-state`
  23
  24 To learn more, run the command again with --verbose.