Trait Template
erst
pub trait Template { fn render_into(&self, writer: &mut dyn Write) -> Result; fn size_hint() -> usize; fn render(&self) -> Result<String, Error> { ... } }
The rendering trait derived by the proc macro
fn render_into(&self, writer: &mut dyn Write) -> Result
fn size_hint() -> usize
fn render(&self) -> Result<String, Error>