anchor.diff:          member __.Relationships = seq [PredefinedPeekRelationships.Definitions]
           member __.GetOrCreateResultSource _relationshipName = 
               { new IPeekResultSource with
  -                member __.FindResults(relationshipName, resultCollection, cancellationToken, callback) =
  +                member __.FindResults(relationshipName, resultCollection, _ct, _callback) =
                       if relationshipName <> PredefinedPeekRelationships.Definitions.Name then ()
                       else 
                           let filePath = range.FileName
  
positive.code:             let generalOptions = Setting.getGeneralOptions serviceProvider
              if generalOptions == null || not generalOptions.PeekDefinitionEnabled then null
              else
                  match textDocumentFactoryService.TryGetTextDocument buffer with
                  | true, doc ->
                      buffer.Properties.GetOrCreateSingletonProperty(
                          fun() -> 
                              upcast new PeekableItemSource(buffer, doc, peekResultFactory,
                                                            serviceProvider, projectFactory, vsLanguageService))
                  | _ -> null
negative.code: open FSharpVSPowerTools.ProjectSystem
  open Microsoft.FSharp.Compiler
  open Microsoft.FSharp.Compiler.SourceCodeServices
  open EnvDTE
  
  type internal DefinitionPeekableItem(span: SnapshotSpan, range: Range.range, peekResultFactory: IPeekResultFactory) =
      interface IPeekableItem with
  