Code shared from the Rust Playground

playground.rs

trait Rendered {
    fn render(&mut self);
}

struct TextLabel {
}

impl Rendered for TextLabel {
	fn render(&mut self) {
		println!("TextLabel");
	}
}

struct ColorPot {
}

impl Rendered for ColorPot {
	fn render(&mut self) {
		println!("ColorPot");
	}
}

pub fn main() {
    let mut widgets: Vec<Box<Rendered>> = Vec::new();
    widgets.push(Box::new(TextLabel {}));
    widgets.push(Box::new(ColorPot {}));
// 	let mut widgets: Vec<Box<Rendered>> = vec!(Box::new(TextLabel {}), Box::new(ColorPot {}));
	for w in &mut widgets {
		w.render();
	}
}