Make raft::Driver::execute() non-async and private.

src/raft/state.rs

@@ -82,7 +82,7 @@ impl Driver {
  pub async fn drive(mut self, mut state: Box<dyn State>) -> Result<()> {
  debug!("Starting state machine driver at applied index {}", state.get_applied_index());
  while let Some(instruction) = self.state_rx.next().await {
- if let Err(error) = self.execute(instruction, &mut *state).await {
+ if let Err(error) = self.execute(instruction, &mut *state) {
  error!("Halting state machine due to error: {}", error);
  return Err(error);
  }
@@ -121,7 +121,7 @@ impl Driver {
  }
 
  /// Executes a state machine instruction.
- pub async fn execute(&mut self, i: Instruction, state: &mut dyn State) -> Result<()> {
+ fn execute(&mut self, i: Instruction, state: &mut dyn State) -> Result<()> {
  debug!("Executing {:?}", i);
  match i {
  Instruction::Abort => {