message: remove dead struct
diff: @@ -70,16 +70,6 @@ impl std::fmt::Debug for Runtime {
  }
  }
  -#[derive(Clone, Debug)]
  -struct CycleDetected {
  - /// Common recovery strategy to all participants in the cycle,
  - /// or [`CycleRecoveryStrategy::Panic`] otherwise.
  - pub(crate) recovery_strategy: CycleRecoveryStrategy,
  -
  - /// Cycle participants.
  - pub(crate) cycle: Cycle,
  -}
  -
  impl Runtime {
  /// Create a new runtime; equivalent to `Self::default`. This is
  /// used when creating a new database.
  