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$ cargo run
   Compiling ownership v0.1.0 (file:///projects/ownership)
error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immutable
  --> src/main.rs:18:5
   |
16 |     let word = first_word(&s);
   |                           -- immutable borrow occurs here
17 | 
18 |     s.clear(); // error!
   |     ^^^^^^^^^ mutable borrow occurs here
19 | 
20 |     println!("the first word is: {}", word);
   |                                       ---- immutable borrow later used here

For more information about this error, try `rustc --explain E0502`.
error: could not compile `ownership` due to previous error