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$ cargo run
Compiling ownership v0.1.0 (file:///projects/ownership)
error[E0596]: cannot borrow `*some_string` as mutable, as it is behind a `&` reference
--> src/main.rs:8:5
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7 | fn change(some_string: &String) {
| ------- help: consider changing this to be a mutable reference: `&mut String`
8 | some_string.push_str(", world");
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `some_string` is a `&` reference, so the data it refers to cannot be borrowed as mutable
For more information about this error, try `rustc --explain E0596`.
error: could not compile `ownership` due to previous error
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