Document breaking change for VB

docs/compilers/Visual Basic/Compiler Breaking Changes - DotNet 10.md

@@ -0,0 +1,37 @@
+# Breaking changes in Roslyn after .NET 9.0.100 through .NET 10.0.100
+
+This document lists known breaking changes in Roslyn after .NET 9 general release (.NET SDK version 9.0.100) through .NET 10 general release (.NET SDK version 10.0.100).
+
+## Set state of enumerator object to "after" during disposal
+
+***Introduced in Visual Studio 2022 version 17.13***
+
+The state machine for enumerators incorrectly allowed resuming execution after the enumerator was disposed.  
+Now, `MoveNext()` on a disposed enumerator properly returns `false` without executing any more user code.
+
+```vb
+Imports System
+Imports System.Collections.Generic
+
+Module Program
+    Sub Main()
+        Dim enumerator = C.GetEnumerator()
+
+        Console.Write(enumerator.MoveNext()) ' prints True
+        Console.Write(enumerator.Current)    ' prints 1
+
+        enumerator.Dispose()
+
+        Console.Write(enumerator.MoveNext()) ' now prints False
+    End Sub
+End Module
+
+Class C
+    Public Shared Iterator Function GetEnumerator() As IEnumerator(Of Integer)
+        Yield 1
+        Console.Write("not executed after disposal")
+        Yield 2
+    End Function
+End Class
+```
+

src/Compilers/VisualBasic/Test/Emit/CodeGen/CodeGenIterators.vb

@@ -3072,6 +3072,5 @@ End Class
 
             CompileAndVerify(source2, expectedOutput:="True finally True")
         End Sub
-        'TODO2 document break in VB too
     End Class
 End Namespace