syntax_data: {"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let fmt = format!("bgcolor=\"{}\" sides=\"tl\"", Self::HEADER_COLOR);
context_before:         // B
context_after:         write!(w, concat!("<tr>", r#"<td colspan="2" {fmt}>MIR</td>"#,), fmt = fmt,)?;