message: HeapSummary::summary()
  Summary: Public function to make field private (D38440922) and change its type.
diff: @@ -116,6 +116,13 @@ pub struct HeapSummary {
  pub summary: HashMap<String, (usize, usize)>,
  }
  +impl HeapSummary {
  + /// (Count, total size) by type.
  + pub fn summary(&self) -> HashMap<String, (usize, usize)> {
  + self.summary.clone()
  + }
  +}
  +
  pub(crate) trait ArenaVisitor<'v> {
  fn regular_value(&mut self, value: &'v AValueOrForward);
  fn call_enter(&mut self, function: Value<'v>, time: Instant);
  