Move strings

• We can assign a variable that contains a "mutable string" to another variable

• But this is called a "move" as we move the ownership of the data to the new variable.

• After that we cannot use the old variable any more.

• This will be fun when would like to change one of the variables or if we pass it to a function.

• The variable "owns" the data.

• If we assign the variable to another variable, we pass (move) the ownership.

fn main() {
    let name = String::from("Foo");
    println!("{name}");

    let other = name;
    println!("{other}");

    // println!("{name}"); // value borrowed here after move
}

Foo
Foo

error[E0382]: borrow of moved value: `name`
 --> examples/ownership/move_string.rs:8:15
  |
2 |     let name = String::from("Foo");
  |         ---- move occurs because `name` has type `String`, which does not implement the `Copy` trait
...
5 |     let other = name;
  |                 ---- value moved here
...
8 |     println!("{name}"); // value borrowed here after move
  |               ^^^^^^ value borrowed here after move
  |
  = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider cloning the value if the performance cost is acceptable
  |
5 |     let other = name.clone();
  |                     ++++++++

error: aborting due to previous error

For more information about this error, try `rustc --explain E0382`.