message: Use Option<_>::map instead of a match statement
diff: @@ -159,9 +159,8 @@ where
  pub fn verifier_index(&self) -> VerifierIndex<G> {
  let domain = self.cs.domain.d1;
  let lookup_index = {
  - match self.cs.lookup_constraint_system.as_ref() {
  - None => None,
  - Some(cs) => Some(LookupVerifierIndex {
  + self.cs.lookup_constraint_system.as_ref().map(|cs| {
  + LookupVerifierIndex {
  lookup_used: cs.lookup_used,
  lookup_selectors: cs
  .lookup_selectors
  @@ -177,8 +176,8 @@ where
  .collect()
  })
  .collect(),
  - }),
  }
  + })
  };
  // TODO: Switch to commit_evaluations for all index polys
  VerifierIndex {
  