@@ -10,6 +10,6 @@ namespace MvvmCross.Base
     public interface IMvxMainThreadDispatcher
     {
         [Obsolete("Use IMvxMainThreadAsyncDispatcher.ExecuteOnMainThreadAsync instead")]
-        bool RequestMainThreadAction(Action action, bool maskExceptions = true);
+        void RequestMainThreadAction(Action action, bool maskExceptions = true);
     }
 }
﻿// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MS-PL license.
// See the LICENSE file in the project root for more information.

using System;
using System.Threading.Tasks;

namespace MvvmCross.Base
{
    public interface IMvxMainThreadDispatcher
    {
        [Obsolete("Use IMvxMainThreadAsyncDispatcher.ExecuteOnMainThreadAsync instead")]
        bool RequestMainThreadAction(Action action, bool maskExceptions = true);
    }
}

Don't change the return type - this is an unnecessary breaking change for any code that uses the result. Keep this PR focussed on the one thing