minor API fixes

Sources/Store/concurrency/Executor.swift

@@ -32,7 +32,7 @@ public final class Executor {
     transactions: [AnyTransaction],
     handler: TransactionCompletion = nil
   ) {
-    let error = AnyError()
+    let error = ErrorStorage()
     var completionOperation: Operation?
     if let completionHandler = handler {
       /// Wraps the completion handler in an operation.

Sources/Store/serialization/Signpost.swift

@@ -10,7 +10,7 @@ public final class SignpostTransaction: AnyTransaction {
 
   public let id: String = PushID.default.make()
   public let strategy: Executor.Strategy = .async(nil)
-  public var error: AnyError? = nil
+  public var error: ErrorStorage? = nil
 
   /// - note: Never set because `SignpostTransaction`s do not have a backing operation.
   public var operation: AsyncOperation {

Sources/Store/transactions/Transaction.swift

@@ -34,7 +34,7 @@ public protocol AnyTransaction: class, Cancellable {
   var strategy: Executor.Strategy { get }
 
   /// Tracks any error that might have been raised in this transaction group.
-  var error: AnyError? { get set }
+  var error: ErrorStorage? { get set }
 
   /// Represents the transaction execution progress.
   /// Trackable `@Published` property.
@@ -93,7 +93,7 @@ public final class Transaction<A: Action>: AnyTransaction, Identifiable {
   public var actionId: String { action.id }
   public let id: String = PushID.default.make()
   public var strategy = Executor.Strategy.async(nil)
-  public var error: AnyError?
+  public var error: ErrorStorage?
   public var opaqueStoreRef: AnyStore? {
     set {
       guard let newValue = newValue as? A.AssociatedStoreType else { return }
@@ -154,7 +154,7 @@ public final class Transaction<A: Action>: AnyTransaction, Identifiable {
     let context = TransactionContext(
       operation: operation,
       store: store,
-      errorRef: error,
+      errorStorage: error,
       transaction: self)
     action.reduce(context: context)
   }
@@ -189,7 +189,7 @@ public final class Transaction<A: Action>: AnyTransaction, Identifiable {
     let context = TransactionContext(
       operation: operation,
       store: store,
-      errorRef: error,
+      errorStorage: error,
       transaction: self)
     action.cancel(context: context)
     context.reject(error: error.error!)

Sources/Store/transactions/TransactionContext.swift

@@ -8,9 +8,9 @@ public struct TransactionContext<S: ReducibleStore, A: Action> {
   /// The target store for this transaction.
   public let store: S
   /// Error internal storage.
-  public var errorRef = AnyError()
+  public var errorStorage = ErrorStorage()
   /// Last recorded error in this dispatch group.
-  public var error: Error? { errorRef.error }
+  public var error: Error? { errorStorage.error }
   /// The current transaction.
   public let transaction: Transaction<A>
 
@@ -31,7 +31,7 @@ public struct TransactionContext<S: ReducibleStore, A: Action> {
 
   /// Terminates this operation with an error.
   public func reject(error: Error) {
-    self.errorRef.error = error
+    self.errorStorage.error = error
     operation.finish()
   }
 
@@ -41,8 +41,8 @@ public struct TransactionContext<S: ReducibleStore, A: Action> {
   }
 }
 
-// MARK: - ErrorRef
+// MARK: - errorStorage
 
-public final class AnyError {
+public final class ErrorStorage {
   public var error: Error?
 }