function parseObject($isConst)
{
$start = $this->lexer->token;
$this->expect(Token::BRACE_L);
$fields = [];
while (!$this->skip(Token::BRACE_R)) {
$fields[] = $this->parseObjectField($isConst);
}
return new ObjectValueNode(['fields' => $fields, 'loc' => $this->loc($start)]);
}