qiskit/releasenotes/notes/0.19/expr_free_symbols_deprecati...

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---
fixes:
- |
Fixed a deprecation warning emitted when running
:meth:`.QuantumCircuit.draw` or :func:`.circuit_drawer` with Sympy 1.9
installed, mentioning the Sympy function ``expr_free_symbols()``.
The circuit drawers previously made use of this method when finding
instances of symbolic constants.