message: joint_combiner non-optional
diff: @@ -61,7 +61,7 @@ impl<F: FftField> ProofEvaluations<Vec<F>> {
  #[derive(Clone, Debug)]
  pub struct RandomOracles<F: Field> {
  - pub joint_combiner: Option<(ScalarChallenge<F>, F)>,
  + pub joint_combiner: (ScalarChallenge<F>, F),
  pub beta: F,
  pub gamma: F,
  pub alpha_chal: ScalarChallenge<F>,
  @@ -88,7 +88,7 @@ impl<F: Field> Default for RandomOracles<F> {
  zeta_chal: c,
  v_chal: c,
  u_chal: c,
  - joint_combiner: None,
  + joint_combiner: (c, F::zero()),
  }
  }
  }
  