message: Remove unused lifetime.
diff: @@ -346,7 +346,7 @@ impl<I: NodeIdT, C: Context + 'static> Synchronizer<I, C> {
  /// Pops and returns the next entry from `vertices_to_be_added` that is not yet in the protocol
  /// state. Also returns a `ProtocolOutcome` that schedules the next action to add a vertex,
  /// unless the queue is empty, and `ProtocolOutcome`s to request missing dependencies.
  - pub(crate) fn pop_vertex_to_add<'a>(
  + pub(crate) fn pop_vertex_to_add(
  &mut self,
  highway: &Highway<C>,
  pending_values: &HashMap<ProposedBlock<C>, HashSet<(ValidVertex<C>, I)>>,
  