message: Make HeapSummary::summary private
  Summary: Can be useful, but not used. Hide to make refactoring easier.
diff: @@ -113,7 +113,7 @@ pub struct HeapSummary {
  /// For each type, give the (number of entries, size of all entries).
  /// The size may be approximate as it includes information from
  /// the approximate [`memory_size`](StarlarkValue::memory_size) function.
  - pub summary: HashMap<String, (usize, usize)>,
  + pub(crate) summary: HashMap<String, (usize, usize)>,
  }
  impl HeapSummary {
  