Updated the example

#include <qalloc>

// Creates a 4-qubit GHZ state |0000> + |1111>

// which, on ibmq_ourense, will require mapping

// to fit its connectivity graph  

__qpu__ void test_xasm(qreg q) {

  using qcor::xasm;

// Create a multi-qubit entangled state 

__qpu__ void entangleQubits(qreg q) {

  H(q[0]);

  CX(q[0],q[1]);

  CX(q[0],q[2]);

  CX(q[0],q[3]);

  Measure(q[0]);

  Measure(q[1]);

  Measure(q[2]);

  Measure(q[3]);

  for (int i = 1; i < q.size(); i++) {

    CX(q[0],q[i]);

  }

  for (int i = 0; i < q.size(); i++) {

    Measure(q[i]);

  }

}

// Example: using ibmq_ourense (5 qubits) which has 

int main() {

  // This circuit requires 4 qubits.

  auto q = qalloc(4);

  test_xasm(q);

  entangleQubits(q);

  // Expect: ~50-50 for "0000" and "1111"

  // (plus some variations due to noise)

  q.print();