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fn main() {
let s1 = gives_ownership(); // gives_ownership 将它的返回值传递给 s1
let s2 = String::from("hello"); // s2 进入作用域
let s3 = takes_and_gives_back(s2); // s2 被传入 takes_and_gives_back,
// 它的返回值又传递给 s3
} // 此处，s3 移出作用域并被丢弃。s2 被 move，所以无事发生
// s1 移出作用域并被丢弃
fn gives_ownership() -> String { // gives_ownership 将会把返回值传入
// 调用它的函数
let some_string = String::from("yours"); // some_string 进入作用域
some_string // 返回 some_string 并将其移至调用函数
}
// 该函数将传入字符串并返回该值
fn takes_and_gives_back(a_string: String) -> String {
// a_string 进入作用域
a_string // 返回 a_string 并移出给调用的函数
