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fn main ( ) {
let s1 = gives_ownership ( ) ; // gives_ownership 将返回值
// 转移给 s1
let s2 = String ::from ( "hello" ) ; // s2 进入作用域
let s3 = takes_and_gives_back ( s2 ) ; // s2 被移动到
// takes_and_gives_back 中，
// 它也将返回值移给 s3
} // 这里，
// 所以什么也不会发生。s1 离开作用域并被丢弃
fn gives_ownership ( ) -> String { // gives_ownership 会将
// 返回值移动给
// 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
// 并移出给调用的函数
//
}
// takes_and_gives_back 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
}
