anchor.diff:                  match thisTyconRef with
                   | None -> ()
                   | Some (Some tcref) -> yield Choice1Of2(tcref, ilExtMem)
  -                | Some None -> yield Choice2Of2 ilExtMem  ]
  +                | Some None -> yield Choice2Of2 ilExtMem ]
       else
           []       
   
  
positive.code:        ePatItems = nenv.ePatItems.Add (ecref.LogicalName, item) }
  
  /// Add a module abbreviation to the name resolution environment 
  let AddModuleAbbrevToNameEnv (id:Ident) nenv modrefs = 
      {nenv with
         eModulesAndNamespaces=
           let add old nw = nw @ old
           NameMap.layerAdditive add (Map.add id.idText modrefs Map.empty) nenv.eModulesAndNamespaces }
  
  
negative.code:     assert ecref.IsExceptionDecl
      let item = Item.ExnCase ecref
      {nenv with 
         eUnqualifiedItems =
              match bulkAddMode with 
              | BulkAdd.Yes -> 
                  nenv.eUnqualifiedItems.AddAndMarkAsCollapsible [| KeyValuePair(ecref.LogicalName, item) |]
  