qiskit/qasm/qasmparser.py
def p_unitary_op_1(self, program):
        """
        unitary_op : CX primary ',' primary
        """
        program[0] = node.Cnot([program[2], program[4]])
        self.verify_reg(program[2], 'qreg')
        self.verify_reg(program[4], 'qreg')
        self.verify_distinct([program[2], program[4]])
def p_unitary_op_1(self, program):
        """
        unitary_op : CX primary ',' primary
        """
        program[0] = node.Cnot([program[2], program[4]])
        self.verify_reg(program[2], 'qreg')
        self.verify_reg(program[4], 'qreg')
        self.verify_distinct([program[2], program[4]])
unitary_op : CX primary ',' primary