private function parseUnsetStatement()
{
$this->tokenStack->push();
$this->consumeToken(Tokens::T_UNSET);
$this->consumeComments();
$this->consumeToken(Tokens::T_PARENTHESIS_OPEN);
$stmt = $this->builder->buildAstUnsetStatement();
$stmt = $this->parseVariableList($stmt);
$this->consumeToken(Tokens::T_PARENTHESIS_CLOSE);
$this->parseStatementTermination();
return $this->setNodePositionsAndReturn($stmt);
}