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- fn main() {
- let s1 = gives_ownership(); // gives_ownership moves its return
- // value into s1
- let s2 = String::from("hello"); // s2 comes into scope
- let s3 = takes_and_gives_back(s2); // s2 is moved into
- // takes_and_gives_back, which also
- // moves its return value into s3
- } // Here, s3 goes out of scope and is dropped. s2 goes out of scope but was
- // moved, so nothing happens. s1 goes out of scope and is dropped.
- fn gives_ownership() -> String { // gives_ownership will move its
- // return value into the function
- // that calls it
- let some_string = String::from("hello"); // some_string comes into scope
- some_string // some_string is returned and
- // moves out to the calling
- // function
- }
- // takes_and_gives_back will take a String and return one
- fn takes_and_gives_back(a_string: String) -> String { // a_string comes into
- // scope
- a_string // a_string is returned and moves out to the calling function
- }
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