helper function: Circuit::test_proof_and_verify()
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The constant value is passed in through the MyCircuit struct. In MyCircuit::without_witnesses(), this constant is set to F::ZERO (F::default()). Because keygen uses without_witnesses() to define the circuit, the constant value is set to zero in ConstraintSystem; however, at proving time, MyCircuit passes in a nonzero constant. This causes the equality constraint in assign_advice_from_constant to fail. In general, fixed values should be copied in without_witnesses().
therealyingtong
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