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// move_semantics4.rs
// 重构这段代码，做到删除 `vec0` ，并在 `fn fill_vec` 而非 `fn main` 中创建 vector ，
// 然后将新创建的 vector 从 `fill_vec` 转移到其调用者。
// 执行 `rustex hint move_semantics4` 获取提示 :)
// I AM NOT DONE
fn main() {
let vec0 = Vec::new();
let mut vec1 = fill_vec(vec0);
println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
vec1.push(88);
}
// `fill_vec()` 不再获取 `vec: Vec<i32>` 参数
fn fill_vec() -> Vec<i32> {
let mut vec = vec;
vec.push(22);
vec.push(44);
vec.push(66);
vec
