{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"self.span_to_snippet(e.span)"}]}
                        self.span_to_snippet(e.span)
                    let expr_to_str = |e: &Expr| {
                            .unwrap_or_else(|_| pprust::expr_to_string(e))