Qiskit/qiskit_humaneval huggingface dataset:
from qiskit import QuantumCircuit
from numpy import pi
def for_loop_circuit(qc: QuantumCircuit, n: int) -> QuantumCircuit:
    """ Add a sub-circuit to the quantum circuit `qc` that applies a series of operations for `n` iterations using the `for_loop`.

    In each iteration `i`, perform the following:
    1. Apply a `RY` rotation on qubit 0 with an angle of `pi/n * i`.
    2. Apply a Hadamard gate to qubit 0 and a CNOT gate between qubits 0 and 1 to create a phi plus Bell state.
    3. Measure qubit 0 and store the result in the corresponding classical register.
    4. Break the loop if the classical register for qubit 0 measures the value 1.

    Use the `for_loop` control flow structure to implement the loop and include conditional breaking based on the measurement.
    """
    with qc.for_loop(range(n)) as i:
        qc.ry(pi/n*i, 0)
        qc.h(0)
        qc.cx(0, 1)
        qc.measure(0, 0)
        qc.break_loop().c_if(0, 1)
    return qc


def check(candidate):
    from qiskit.circuit.library import RYGate, HGate, CXGate, Measure
    from qiskit.circuit import BreakLoopOp, CircuitInstruction

    qc = QuantumCircuit(2,1)
    solution = candidate(qc, 2)
    
    assert len(solution.data) > 0, "Circuit should have operations added"
    
    op = solution.data[0].operation

    assert op.name == "for_loop"
    assert op.num_qubits == 2 and op.num_clbits == 1
    indexset, loop_param, sub_qc = op.params
    assert indexset == range(2)
    
    # Test sub circuit
    data = sub_qc.data
    qr = qc.qregs[0]
    cr = qc.cregs[0]
    assert data[0] == CircuitInstruction(RYGate(pi/2*loop_param), [qr[0]], [])
    assert data[1] == CircuitInstruction(HGate(), [qr[0]], [])
    assert data[2] == CircuitInstruction(CXGate(), [qr[0], qr[1]], [])
    assert data[3] == CircuitInstruction(Measure(), [qr[0]],[cr[0]])
    assert data[4] == CircuitInstruction(BreakLoopOp(2,1), [qr[0], qr[1]], [cr[0]]) or CircuitInstruction(BreakLoopOp(2,1), [qr[1], qr[0]], [cr[0]])