From df439c1ac7547e9e8bea8d19786da9dfaf1442cc Mon Sep 17 00:00:00 2001
From: Adrian Z <adrian.zubarev@devandartist.com>
Date: Sat, 27 Oct 2018 19:00:32 +0200
Subject: [PATCH] Update Disposable.swift

Discard a disposable on `SerialDisposable` when the instance of the `SerialDisposable` is already disposed.
---
 Sources/Disposable.swift | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Sources/Disposable.swift b/Sources/Disposable.swift
index 73220dbe2..f364ab895 100644
--- a/Sources/Disposable.swift
+++ b/Sources/Disposable.swift
@@ -350,10 +350,10 @@ public final class SerialDisposable: Disposable {
 		}
 
 		set(disposable) {
-			_inner.swap(disposable)?.dispose()
-
-			if let disposable = disposable, isDisposed {
-				disposable.dispose()
+			if isDisposed {
+				disposable?.dispose()
+			} else {
+				_inner.swap(disposable)?.dispose()
 			}
 		}
 	}