{"ast_node_type":"other","tokens":[{"end":29,"kind":"keyword","start":0,"text":")"}]}
                    ) && self
                            | Op::AssignOp(Spanned { node: hir::AssignOpKind::AddAssign, .. })
                        .check_str_addition(lhs_expr, rhs_expr, lhs_ty, rhs_ty, &mut err, op)