anchor.diff:  
     /// Metadata display name.
     override this.DisplayName =
  -    let name = TestMetadata.safeName(this.Name, this.SymbolName)
  +    let symbolName = TestMetadata.safeName(this.RawSymbolName, "[Unresolved]")
  +    let name = TestMetadata.safeName(this.Name, symbolName)
       this.createUniqueName name
   
   //  interface ITestCase with
  
positive.code:   member internal this.trySetParent(parent: TestMetadata) =
      match this._parent with
      | None -> this._parent <- Some parent
      | _ -> //()
        Debug.Assert(false, parent.ToString())
        this._parent <- Some parent
  
  //  interface ITestMetadata with
  //    member this.Name = this.Name
  
negative.code:   /// Metadata display name.
    abstract DisplayName : string
  
    /// For internal use only.
    member internal this.RawSymbolName = this._symbolName
  
    /// Metadata symbol name.
    /// This naming contains parent context symbol names.
    member this.SymbolName =
  