anchor.diff:        let helpTree = MonoDevelop.Projects.HelpService.HelpTree
         if helpTree = null then None else
         try
  -          let rendered = helpTree.RenderUrl(key, rawGenerator)
  -          if rendered = null then
  -              None
  -          else
  -              let doc = XmlDocument()
  -              doc.LoadXml rendered
  -              Some doc
  +
  +          let helpxml = helpTree.GetHelpXml(key)
  +          if helpxml = null then None else Some(helpxml)
         with ex ->
             LoggingService.LogError ("GetHelpXml failed for key {0}", key, ex)
             None
  
positive.code: namespace MonoDevelop.FSharp
  open System
  open System.IO
  
negative.code:         if par = null then None else Some((elementValue addStyle par).ToString())
  
  module TooltipXmlDoc =
      ///lru based memoize
      let private memoize f n =
          let lru = ref (ExtCore.Caching.LruCache.create n)
  