From 54f6693e842c607ec4c9346c5003b4ce8f9e6c4d Mon Sep 17 00:00:00 2001
From: Sam Rawlins <sam.rawlins@gmail.com>
Date: Mon, 13 Aug 2018 16:03:07 -0700
Subject: [PATCH] Fix MISSING_RETURN error in concat.dart (#476)

* Fix MISSING_RETURN error in concat.dart

* Return null instead

* dartfmt
---
 lib/src/async/concat.dart | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/src/async/concat.dart b/lib/src/async/concat.dart
index cd02a803..f894cf97 100644
--- a/lib/src/async/concat.dart
+++ b/lib/src/async/concat.dart
@@ -71,7 +71,10 @@ class _ConcatStream<T> extends Stream<T> {
     }, onResume: () {
       if (currentSubscription != null) currentSubscription.resume();
     }, onCancel: () {
-      if (currentSubscription != null) return currentSubscription.cancel();
+      if (currentSubscription != null)
+        return currentSubscription.cancel();
+      else
+        return null;
     });
 
     nextStream();