rust - How to delay destruction of unnamed objects? -

i using tempdir struct create , remove folders on disk. tempdir not referenced in code apart construction.

since compiler warns unused objects, tried (un)naming tempdir-struct _ results in struct being destroyed.

is there nice solution this?

see example code, compare one two:

pub struct res; impl drop res {     fn drop(&mut self) {         println!("dropping self!");     } }  fn one() {     println!("one");     let r = res; // <--- dropping @ end of function                   //      compiler warns unused object     println!("before exit"); }  fn two() {     println!("two");     let _ = res;  // <--- dropping     println!("before exit"); }  fn main() {     one();     two(); } 

giving variable name prefixing name underscore delays destruction until end of scope not trigger unused variable warning.

struct noisy;  impl drop noisy {     fn drop(&mut self) {         println!("dropping");     } }  fn main() {     {         let _ = noisy;         println!("before end of first scope");     }      {         let _noisy = noisy;         println!("before end of second scope");     } } 

dropping before end of first scope before end of second scope dropping