Changes to help the Xcode 12 compiler along 🙈

Author: mluisbrown

Examples/MotionManager/MotionManager/MotionManagerView.swift

@@ -176,12 +176,12 @@ struct AppView_Previews: PreviewProvider {
       create: { _ in .fireAndForget {} },
       destroy: { _ in .fireAndForget {} },
       deviceMotion: { _ in nil },
-      startDeviceMotionUpdates: { _, _, _ in
+      startDeviceMotionUpdates: { _, _, _ -> Effect<DeviceMotion, Error> in
         isStarted = true
         return Effect.timer(interval: .milliseconds(100), on: QueueScheduler.main)
-          .filter { _ in isStarted }
-          .map { $0.timeIntervalSince1970 * 2 }
-          .map { t in
+          .filter { _ -> Bool in isStarted }
+          .map { t -> TimeInterval in t.timeIntervalSince1970 * 2 }
+          .map { t -> DeviceMotion in
             DeviceMotion(
               attitude: .init(quaternion: .init(x: 1, y: 0, z: 0, w: 0)),
               gravity: .init(x: sin(2 * t), y: -cos(-t), z: sin(3 * t)),

Sources/ComposableArchitecture/Effects/Cancellation.swift

@@ -48,10 +48,10 @@ extension Effect {
 
       let disposable =
         self
-        .on {
+        .on(value: {
           guard isCaching else { return }
           values.append($0)
-        }
+        })
         .start(subject.input)
 
       var cancellationDisposable: AnyDisposable!