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The documentation for Cirq mentions the possibility to step through a circuit's moments, and access the exact wavefunction via step.state_vector(), and edit set it via step.set_state(). In the API documentation, neither function is documented. While the former seems to work anyway, the latter (setting the state) gives an AttributeError. I am using Cirq 0.9.1.

How can I change the wavefunction used for the next moment simulation?

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You found a bug in the docs, the method is set_state_vector() - I opened https://github.com/quantumlib/Cirq/issues/3623.

The methods are only available on the SparseSimulatorStep which is the default simulator in Cirq.

They are available in the API docs though set_state_vector has no docstring:

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