ManualEventIterator does not implement Debug

[Zoomulator]

Bevy version

0.11

What you did

I wanted to reduce some incoming events into a single value. I expect left click events to only happen once (at least for now, I know it's probably not ideal) for the system and if it doesn't it'll just log the error via the try operator (?).

fn my_system(mut mouse_button_events: EventReader<MouseButtonInput>) -> Result<(), Box<dyn Error>>{
  if let Some(interaction) = mouse_button_events
      .iter()
      .flat_map(|event| match (event.button, event.state) {
          (MouseButton::Left, ButtonState::Pressed) => Some(Interaction::Pressed),
          (MouseButton::Left, ButtonState::Released) => Some(Interaction::Hovered),
          _ => None,
      })
      .at_most_one()?;
      // ...
}

What went wrong

The compiler complained that ManualEventIterator does not implement Debug, which is required to generate the at_most_one error result.

Additional information

You can work around this by adding .collect_vec().into_iter() between the flat_map and at_most_one calls.