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use crate::widget::unit::WidgetUnit; pub trait Renderer<T, E> { fn render(&mut self, tree: &WidgetUnit) -> Result<T, E>; } #[derive(Debug, Default, Copy, Clone)] pub struct RawRenderer; impl Renderer<WidgetUnit, ()> for RawRenderer { fn render(&mut self, tree: &WidgetUnit) -> Result<WidgetUnit, ()> { Ok(tree.clone()) } }