BUG: VB Fails When Editing Modules That Are Interdependent (190198)


The information in this article applies to:

  • Microsoft Visual Basic Learning Edition for Windows 6.0
  • Microsoft Visual Basic Professional Edition for Windows 6.0
  • Microsoft Visual Basic Enterprise Edition for Windows 6.0
This article was previously published under Q190198

SYMPTOMS

When your project contains modules that are heavily dependent upon each other for variable definitions (such as a constant being the type of another module, or passing a UDT defined in one module to another), editing one module will gradually cause Microsoft Visual Basic to fail.

CAUSE

The problem is caused by an illegal circular dependency cycle between the modules.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Behavior

  1. Create a new ActiveX DLL project in Visual Basic. Class1 is created by default.
  2. Paste the following code in Class1: 
          Public Type UDT3
         a As Class2
         b As Class3
      End Type

      Public Enum Enum1
         red
      End Enum

      Public Sub T(a As UDT3)
      End Sub
  3. Add a class module (Class2) to the project, and paste the following code in Class2: 
          Public Sub Test(a As Enum2)
      End Sub
      Public Sub Test2(a As Enum1)
      End Sub
  4. Add a class module (Class3) to the project, and paste the following code into Class3: 
          Public Enum Enum2
         Green
      End Enum

      Private Const C1 = Enum1.red
  5. In Class1, add the following line of code as a third field to Type UDT3: 
          c as long
Notice that Visual Basic fails after typing "c as ." It also crashes if you add a member to Enum1 in Class1 or add a procedure and then press the F5 key.
Modification Type:MajorLast Reviewed:5/13/2003
Keywords:kbbug KB190198
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