src/doc/book/listings/ch15-smart-pointers/listing-15-21/output.txt

   1 $ cargo test
   2    Compiling limit-tracker v0.1.0 (file:///projects/limit-tracker)
   3 error[E0596]: cannot borrow `self.sent_messages` as mutable, as it is behind a `&` reference
   4   --> src/lib.rs:58:13
   5    |
   6 2  |     fn send(&self, msg: &str);
   7    |             ----- help: consider changing that to be a mutable reference: `&mut self`
   8 ...
   9 58 |             self.sent_messages.push(String::from(message));
  10    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `self` is a `&` reference, so the data it refers to cannot be borrowed as mutable
  11
  12 For more information about this error, try `rustc --explain E0596`.
  13 error: could not compile `limit-tracker` due to previous error
  14 warning: build failed, waiting for other jobs to finish...