code: public com.google.iam.v1.BindingOrBuilder getBindingsOrBuilder(
        int index) {
      return bindings_.get(index);
    }
docs: <pre>
  Associates a list of `members` to a `role`.
  Multiple `bindings` must not be specified for the same `role`.
  `bindings` with no members will result in an error.
  </pre>
  
  <code>repeated .google.iam.v1.Binding bindings = 4;</code>