message: flag new scratch trie in test code for comparison with old method
diff: @@ -146,7 +146,17 @@ pub fn run_blocks_with_transfers_and_step(
  );
  let transfer_root = builder.get_post_state_hash();
  let maybe_auction_root = if run_auction {
  + if use_scratch {
  step_and_run_auction(&mut builder, &validator_keys);
  + } else {
  + builder.advance_era(
  + validator_keys
  + .iter()
  + .cloned()
  + .map(|id| RewardItem::new(id, 1)),
  + );
  + builder.commit();
  + }
  Some(builder.get_post_state_hash())
  } else {
  None
  @@ -175,11 +185,15 @@ pub fn run_blocks_with_transfers_and_step(
  cursor.iter().count()
  };
  + if use_scratch {
  + // This assertion is only valid with the scratch trie.
  assert_eq!(
  necessary_tries.len(),
  total_tries,
  "should not create unnecessary tries"
  );
  + }
  +
  writeln!(
  report_writer,
  "{},{},{},{},{},{}",
  