fn event(&mut self, event: Event<'_>) {
        match event {
            Event::Play(mut speakers) => speakers.stream(&mut self.synth),
        }
    }
/// Event loop.  Return false to stop program.
Event loop.  Return false to stop program.
Event loop . Return false to stop program .
fn event(&mut self, event: Event<'_>) {
        match event {
            Event::Play(mut speakers) => speakers.stream(&mut self.synth),
        }
    }
fn event ( & mut self , event : Event < ' _ > ) { match event { Event :: Play ( mut speakers ) => speakers . stream ( & mut self . synth ) , } }
Event loop.
Event loop .
&mut self
event
Event<'_>
&mut self
event
Event<'_>