Fix warnings.

Author: JohanLarsson

ValidCode.NetCore/AsyncDisposable/Impl1.cs

@@ -0,0 +1,16 @@
+namespace ValidCode.NetCore.AsyncDisposable
+{
+    using System;
+    using System.IO;
+    using System.Threading.Tasks;
+
+    public class Impl1 : IAsyncDisposable
+    {
+        private readonly IAsyncDisposable disposable = File.OpenRead(string.Empty);
+
+        public async ValueTask DisposeAsync()
+        {
+            await this.disposable.DisposeAsync().ConfigureAwait(false);
+        }
+    }
+}

ValidCode.NetCore/AsyncDisposable/Impl.cs …lidCode.NetCore/AsyncDisposable/Impl2.csValidCode.NetCore/AsyncDisposable/Impl.cs renamed to ValidCode.NetCore/AsyncDisposable/Impl2.cs ValidCode.NetCore/AsyncDisposable/Impl.cs renamed to ValidCode.NetCore/AsyncDisposable/Impl2.cs

@@ -4,7 +4,7 @@
     using System.IO;
     using System.Threading.Tasks;
 
-    public class Impl : IAsyncDisposable
+    public class Impl2 : IAsyncDisposable
     {
         private readonly IAsyncDisposable disposable = File.OpenRead(string.Empty);
 

ValidCode.NetCore/AsyncDisposable/Issue199.cs

@@ -6,7 +6,7 @@
 
     public class Issue199 : IAsyncDisposable
     {
-        private Timer _timer;
+        private Timer? _timer;
 
         public async Task ResetTimerAsync()
         {
@@ -19,7 +19,10 @@ public async Task ResetTimerAsync()
 
         public async ValueTask DisposeAsync()
         {
-            await _timer.DisposeAsync();
+            if (this._timer is { })
+            {
+                await _timer.DisposeAsync().ConfigureAwait(false);
+            }
         }
     }
 }