qiskit/releasenotes/notes/0.22/compose-meas-no-meas-492ce9...

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---
features:
- |
:meth:`.QuantumCircuit.compose` will now accept an operand with classical
bits if the base circuit has none itself. The pattern of composing a
circuit with measurements onto a quantum-only circuit is
now valid. For example::
from qiskit import QuantumCircuit
base = QuantumCircuit(3)
terminus = QuantumCircuit(3, 3)
terminus.measure_all()
# This will now succeed, though it was previously a CircuitError.
base.compose(terminus)