Fix compilation errors for swift 5.2

Flow/CoreSignal.swift

@@ -24,7 +24,7 @@ public final class CoreSignal<Kind: SignalKind, Value> {
  public typealias Event = Flow.Event<Value>
  typealias EventType = Flow.EventType<Value>
 
- internal init(onEventType: @escaping (@escaping (EventType) -> Void) -> Disposable, _ noTrailingClosure: Void = ()) {
+ internal init(onEventType: @escaping (@escaping (EventType) -> Void) -> Disposable) {
  self.onEventType = onEventType
  }
 }

Flow/Signal+Scheduling.swift

@@ -71,7 +71,7 @@ public extension CoreSignal where Kind == Plain, Value == () {
  /// - Parameter delay: If provided will delay the first event by `delay`. If nil (default), `interval` will be used as the delay.
  convenience init(every interval: TimeInterval, delay: TimeInterval? = nil) {
  precondition(interval >= 0)
- self.init { callback in
+ self.init(onValue: { callback in
  let bag = DisposeBag()
  guard interval.isFinite else { return bag }
 
@@ -93,7 +93,7 @@ public extension CoreSignal where Kind == Plain, Value == () {
  timer.resume()
 
  return bag
- }
+ })
  }
 
  /// Creates a new signal that will signal once after `delay` seconds. Shorter version of `Signal(just: ()).delay(by: ...)`

Flow/Signal+Transforms.swift

@@ -656,7 +656,7 @@ public extension SignalProvider {
  /// - Note: At most one value is hold at a time and released when `readSignal` becomes true.
  func wait(until readSignal: ReadSignal<Bool>) -> Signal<Value> {
  let signal = providedSignal
- return Signal { callback in
+ return Signal(onValue: { callback in
  let state = StateAndCallback(state: Value?.none, callback: callback)
 
  state += signal.filter(on: .none) { _ in !readSignal.value }.onValue {
@@ -672,7 +672,7 @@ public extension SignalProvider {
  }.atValue(on: .none) { _ in state.protectedVal = nil }.onValue(on: .none, state.callback)
 
  return state
- }
+ })
  }
 }
 

Flow/Signal+Utilities.swift

@@ -11,12 +11,12 @@ import Foundation
 public extension NotificationCenter {
  /// Returns a signal for notifications named `name`.
  func signal(forName name: Notification.Name?, object: Any? = nil) -> Signal<Notification> {
- return Signal { callback in
+ return Signal(onValue: { callback in
  let observer = self.addObserver(forName: name, object: object, queue: nil, using: callback)
  return Disposer {
  self.removeObserver(observer)
  }
- }
+ })
  }
 }
 

FlowTests/SignalProviderTests.swift

@@ -1135,10 +1135,10 @@ class SignalProviderTests: XCTestCase {
  func testSharedSignal() {
  let callbacker = Callbacker<Int>()
  var s1 = 0
- let s = Signal<Int> { c in
+ let s = Signal<Int>(onValue: { c in
  s1 += 1
  return callbacker.addCallback(c)
- }
+ })
 
  var s2 = 0
  var s3 = 0
@@ -1179,10 +1179,10 @@ class SignalProviderTests: XCTestCase {
  func testSharedRemoveAndAdd() {
  let callbacker = Callbacker<Int>()
  var s0 = 0
- let s = Signal<Int> { c in
+ let s = Signal<Int>(onValue: { c in
  s0 += 1
  return callbacker.addCallback(c)
- }
+ })
 
  var s1 = 0
  var s2 = 0