VB.NET Bug?

I think I have found a Bug in VB.NET (Final)! I can't compile the following program (Build Error: 'Private Function Foo() As Integer' and 'Public Function Foo() As String' cannot overload each other because they differ only by return types. ). It worked in Beta2 of VB.NET.

Public Interface ITestInterface

   Function Foo() As Integer

End Interface

Public Class TestClass

   Implements ITestInterface

   Private Function Foo() As Integer Implements VBBug.ITestInterface.Foo
      Return 1
   End Function

   Public Function Foo() As String
      Return "2"
   End Function

End Class

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