Values moved into run closure not having drop called #1058
Description
It appears that values moved into the closure provided to run don't get drop called when the event loop terminates
The example below shows a minimal example. The droppable is moved into the closure and used, but when I close the window, I don't see a "Dropping." message being printed indicating that the value has been dropped as the program terminates.
In contrast, the scope at the start of main shows that in a usual scope, drop gets called correctly.
I may be misunderstanding some of the expected behaviour of drop though, if so I'd appreciate a clarification on this.
Example: (tested on winit 0.20.0-alpha2, MacOS 10.14.4)
use winit::{
event::{Event, WindowEvent},
event_loop::{ControlFlow, EventLoop},
window::WindowBuilder
};
struct Droppable {
x: i32
}
impl Drop for Droppable {
fn drop(&mut self) {
println!("Dropping.");
}
}
fn main() {
{
let _test_droppable = Droppable { x: 7 };
}
let event_loop = EventLoop::new();
let _window = WindowBuilder::new().build(&event_loop).unwrap();
let droppable = Droppable {
x: 7
};
event_loop.run(move |event, _, control_flow| {
println!("x is {}", droppable.x);
match event {
Event::WindowEvent {
event: WindowEvent::CloseRequested,
..
} => *control_flow = ControlFlow::Exit,
_ => *control_flow = ControlFlow::Wait,
}
});
}