Added discardableResult.

Sources/ColdSignal.swift

@@ -116,6 +116,7 @@ extension ColdSignalType {
     /// invokes start on the ColdSignal.
     ///
     /// Returns a Disposable which can be used to dispose of the added observer.
+    @discardableResult
     public func start(with observer: Observer<Value, Error>) -> Disposable? {
         let disposable = add(observer: observer)
         start()
@@ -126,6 +127,7 @@ extension ColdSignalType {
     /// invokes start on the ColdSignal.
     ///
     /// Returns a Disposable which can be used to dispose of the added observer.
+    @discardableResult
     public func start(_ observerAction: Observer<Value, Error>.Action) -> Disposable? {
         return start(with: Observer(observerAction))
     }
@@ -134,6 +136,7 @@ extension ColdSignalType {
     /// invokes start on the ColdSignal.
     ///
     /// Returns a Disposable which can be used to dispose of the added observer.
+    @discardableResult
     public func startWithNext(next: (Value) -> Void) -> Disposable? {
         return start(with: Observer(next: next))
     }
@@ -142,6 +145,7 @@ extension ColdSignalType {
     /// immediately invokes start on the ColdSignal.
     ///
     /// Returns a Disposable which can be used to dispose of the added observer.
+    @discardableResult
     public func startWithCompleted(completed: () -> Void) -> Disposable? {
         return start(with: Observer(completed: completed))
     }
@@ -150,6 +154,7 @@ extension ColdSignalType {
     /// immediately invokes start on the ColdSignal.
     ///
     /// Returns a Disposable which can be used to dispose of the added observer.
+    @discardableResult
     public func startWithFailed(failed: (Error) -> Void) -> Disposable? {
         return start(with: Observer(failed: failed))
     }
@@ -158,8 +163,9 @@ extension ColdSignalType {
     /// immediately invokes start on the ColdSignal.
     ///
     /// Returns a Disposable which can be used to dispose of the added observer.
+    @discardableResult
     public func startWithInterrupted(interrupted: () -> Void) -> Disposable? {
         return start(with: Observer(interrupted: interrupted))
     }
 
-}
+}

Sources/Signal.swift

@@ -176,6 +176,7 @@ extension SignalType {
 
     /// Convenience override for add(observer:) to allow trailing-closure style
     /// invocations.
+    @discardableResult
     public func on(action: Observer<Value, Error>.Action) -> Disposable? {
         return add(observer: Observer(action))
     }
@@ -186,6 +187,7 @@ extension SignalType {
     /// Returns a Disposable which can be used to stop the invocation of the
     /// callbacks. Disposing of the Disposable will have no effect on the Signal
     /// itself.
+    @discardableResult
     public func onNext(next: (Value) -> Void) -> Disposable? {
         return add(observer: Observer(next: next))
     }
@@ -196,6 +198,7 @@ extension SignalType {
     /// Returns a Disposable which can be used to stop the invocation of the
     /// callback. Disposing of the Disposable will have no effect on the Signal
     /// itself.
+    @discardableResult
     public func onCompleted(completed: () -> Void) -> Disposable? {
         return add(observer: Observer(completed: completed))
     }
@@ -206,6 +209,7 @@ extension SignalType {
     /// Returns a Disposable which can be used to stop the invocation of the
     /// callback. Disposing of the Disposable will have no effect on the Signal
     /// itself.
+    @discardableResult
     public func onFailed(error: (Error) -> Void) -> Disposable? {
         return add(observer: Observer(failed: error))
     }
@@ -217,6 +221,7 @@ extension SignalType {
     /// Returns a Disposable which can be used to stop the invocation of the
     /// callback. Disposing of the Disposable will have no effect on the Signal
     /// itself.
+    @discardableResult
     public func onInterrupted(interrupted: () -> Void) -> Disposable? {
         return add(observer: Observer(interrupted: interrupted))
     }
@@ -257,4 +262,4 @@ extension SignalType {
             }
         }
     }
-}
+}