qiskit/qasm/qasmparser.py
def p_unitary_op_0(self, program):
        """
          unitary_op : U '(' exp_list ')' primary
        """
        program[0] = node.UniversalUnitary([program[3], program[5]])
        self.verify_reg(program[5], 'qreg')
        self.verify_exp_list(program[3])
def p_unitary_op_0(self, program):
        """
          unitary_op : U '(' exp_list ')' primary
        """
        program[0] = node.UniversalUnitary([program[3], program[5]])
        self.verify_reg(program[5], 'qreg')
        self.verify_exp_list(program[3])
unitary_op : U '(' exp_list ')' primary