{"ast_node_type":"variable","tokens":[{"end":49,"kind":"keyword","start":0,"text":"let"}]}
                            let op = op.as_str();
                            let rhs = self.tcx.short_string(rhs_adjusted_ty, err.long_ty_path());
                            err.note(format!("an implementation for `{lhs} {op} {rhs}` exists"));