message: change `InProgress` to a struct form
diff: @@ -126,7 +126,7 @@ where
  /// The runtime with the given id is currently computing the
  /// result of this query; if we see this value in the table, it
  /// indeeds a cycle.
  - InProgress(RuntimeId),
  + InProgress { id: RuntimeId },
  /// We have computed the query already, and here is the result.
  Memoized(Memo<DB, Q>),
  @@ -210,7 +210,9 @@ where
  let mut old_value = {
  match self.read_up_to_date_or_cycle(self.map.write(), runtime, revision_now, key) {
  Ok(r) => return r,
  - Err(mut map) => map.insert(key.clone(), QueryState::InProgress(runtime.id())),
  + Err(mut map) => {
  + map.insert(key.clone(), QueryState::InProgress { id: runtime.id() })
  + }
  }
  };
  @@ -307,7 +309,7 @@ where
  MapGuard: Deref<Target = FxHashMap<Q::Key, QueryState<DB, Q>>>,
  {
  match map.get(key) {
  - Some(QueryState::InProgress(id)) => {
  + Some(QueryState::InProgress { id }) => {
  if *id == runtime.id() {
  return Ok(Err(CycleDetected));
  } else {
  @@ -401,7 +403,7 @@ where
  let old_value = map_write.insert(key.clone(), value);
  assert!(
  match old_value {
  - Some(QueryState::InProgress(id)) => id == runtime.id(),
  + Some(QueryState::InProgress { id }) => id == runtime.id(),
  _ => false,
  },
  "expected in-progress state",
  @@ -457,7 +459,7 @@ where
  let value = {
  let map_read = self.map.upgradable_read();
  match map_read.get(key) {
  - None | Some(QueryState::InProgress(_)) => return true,
  + None | Some(QueryState::InProgress { .. }) => return true,
  Some(QueryState::Memoized(memo)) => {
  // If our memo is still up to date, then check if we've
  // changed since the revision.
  @@ -478,7 +480,7 @@ where
  // If, however, we don't cache values, then optimistically
  // try to advance `verified_at` by walking the inputs.
  let mut map_write = RwLockUpgradableReadGuard::upgrade(map_read);
  - map_write.insert(key.clone(), QueryState::InProgress(runtime.id()))
  + map_write.insert(key.clone(), QueryState::InProgress { id: runtime.id() })
  };
  let mut memo = match value {
  @@ -507,7 +509,7 @@ where
  let map_read = self.map.read();
  match map_read.get(key) {
  None => false,
  - Some(QueryState::InProgress(_)) => panic!("query in progress"),
  + Some(QueryState::InProgress { .. }) => panic!("query in progress"),
  Some(QueryState::Memoized(memo)) => memo.changed_at.is_constant(),
  }
  }
  