Source.Stream DisallowNull

src/libraries/Microsoft.Extensions.Configuration/ref/Microsoft.Extensions.Configuration.cs

@@ -114,7 +114,8 @@ public override void Load() { }
     public abstract partial class StreamConfigurationSource : Microsoft.Extensions.Configuration.IConfigurationSource
     {
         protected StreamConfigurationSource() { }
-        public System.IO.Stream Stream { get { throw null; } set { } }
+        [System.Diagnostics.CodeAnalysis.DisallowNull]
+        public System.IO.Stream? Stream { get { throw null; } set { } }
         public abstract Microsoft.Extensions.Configuration.IConfigurationProvider Build(Microsoft.Extensions.Configuration.IConfigurationBuilder builder);
     }
 }

src/libraries/Microsoft.Extensions.Configuration/src/StreamConfigurationSource.cs

@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Diagnostics.CodeAnalysis;
 using System.IO;
 
 namespace Microsoft.Extensions.Configuration
@@ -13,6 +14,7 @@ public abstract class StreamConfigurationSource : IConfigurationSource
         /// <summary>
         /// The stream containing the configuration data.
         /// </summary>
+        [DisallowNull]
         public Stream? Stream { get; set; }
 
         /// <summary>