anchor.diff:          let prefix = "`cfg cycle inside expression"
   
           let expected = [y]
  -        //act
  -        let cfg = buildCfg' qGraph prefix
  -        //assert
  -        runTest' cfg expected
  +
  +        //act
  +        let cfg = buildCfg' qGraph prefix
  +        let errorList = 
  +            cfg.FindUndefinedVariables()
  +            |> List.map tokToRealName
  +        
  +        //assert
  +        assertResult errorList expected
        
   type ``Scope test``() = 
       let parse = LetTest.Parser.buildAstAbstract
  
positive.code:         
          let expected = [y]
          let prefix = "`cfg undefined variables ambiguous2"
          //act
          let cfg = buildCfg' qGraph prefix
          //assert
          runTest' cfg expected
  
      [<Test>]
      member this.``Cycle inside expression``() = 
  
negative.code: 
          //act
          let cfg = buildCfg' qGraph prefix
          let errorList = 
              cfg.FindUndefinedVariables()
              |> List.map tokToRealName
          
          //assert
          assertResult errorList expected
  
  
      [<Test>]
      member test.``Ambiguous``() =
  