{"ast_node_type":"other","tokens":[{"end":18,"kind":"keyword","start":0,"text":"Some(expr)"}]}
        Some(expr)
        let expr = self.expr_map.get(&src)?.as_expr()?;
            .zip(self.template_map.as_ref()?.asm_to_captures.get(&expr).map(std::ops::Deref::deref))