anchor.diff:          | Yard.Generators.RNGLR.Parser.Error (num, tok, message, debug, _) ->
               printfn "Error in position %d on Token %A: %s" num tok message
               debug.drawGSSDot "out.dot"
  +            Assert.Fail "!!!!!!"
           | Yard.Generators.RNGLR.Parser.Success(tree, _) ->
               tree.PrintAst()
               RNGLR.ParseSimpleCalc.defaultAstToDot tree "ast.dot"
  -        Assert.Pass()
  +            Assert.Pass()
   
       [<Test>]
       member this.``Calc. Sequence input.`` () =
  
positive.code:         | Yard.Generators.RNGLR.Parser.Error (num, tok, message, debug, _) ->
              printfn "Error in position %d on Token %A: %s" num tok message
              debug.drawGSSDot "out.dot"
          | Yard.Generators.RNGLR.Parser.Success(tree, _) ->
              tree.PrintAst()
              RNGLR.ParseSimpleCalc.defaultAstToDot tree "ast.dot"
              
          Assert.Pass()
  
      [<Test>]
      member this.``Simple calc. Branch binop and first arg.`` () =
  
negative.code:     let t = new ``RNGLR abstract parser tests`` () 
      //t.``Simple calc. Branch binop input.``  ()
      //t.``Calc. Sequence input.``()
      t.``Calc. Branched input error.``()
      //t.``Simple calc. Branch binop and first arg.``()
      //t.``Simple calc. Branch binop and second arg.``()
      //t.``Simple calc with nterm. Seq input.``()
  