1It is not allowed to manually call destructors in Rust.23Erroneous code example:45```compile_fail,E00406struct Foo {7    x: i32,8}910impl Drop for Foo {11    fn drop(&mut self) {12        println!("kaboom");13    }14}1516fn main() {17    let mut x = Foo { x: -7 };18    x.drop(); // error: explicit use of destructor method19}20```2122It is unnecessary to do this since `drop` is called automatically whenever a23value goes out of scope. However, if you really need to drop a value by hand,24you can use the `std::mem::drop` function:2526```27struct Foo {28    x: i32,29}30impl Drop for Foo {31    fn drop(&mut self) {32        println!("kaboom");33    }34}35fn main() {36    let mut x = Foo { x: -7 };37    drop(x); // ok!38}39```