code: func (c *Client) Call(result interface{}, method string, args ...interface{}) error {
  	ctx := context.Background()
  	return c.CallContext(ctx, result, method, args...)
  }
docs: // Call performs a JSON-RPC call with the given arguments and unmarshals into
  // result if no error occurred.
  //
  // The result must be a pointer so that package json can unmarshal into it. You
  // can also pass nil, in which case the result is ignored.