anchor.diff:                     | Some(assembly) -> OkResult([],Choice2Of2 assembly)
                      | None -> 
   #endif
  -                   
  +
                      // As a last resort, try to find the reference without an extension
                      match tcImports.TryFindExistingFullyQualifiedPathByExactAssemblyRef(ctok, ILAssemblyRef.Create(simpleAssemName,None,None,false,None,None)) with
                      | Some(resolvedPath) -> 
                          OkResult([],Choice1Of2 resolvedPath)
                      | None -> 
  -                   
  +
                      ErrorResult([],Failure (FSIstrings.SR.fsiFailedToResolveAssembly(simpleAssemName)))
  -                           
  +
                  match overallSearchResult with 
                  | ErrorResult _ -> null
                  | OkResult _ -> 
  
positive.code:                // Otherwise continue
                 let assemblyReferenceTextDll = (simpleAssemName + ".dll") 
                 let assemblyReferenceTextExe = (simpleAssemName + ".exe") 
                 let overallSearchResult =           
  
                     // OK, try to resolve as an existing DLL in the resolved reference set.  This does unification by assembly name
                     // once an assembly has been referenced.
  
negative.code:                        assemblyLoadFrom assemblyName
                     | Choice2Of2 assembly -> 
                         assembly
  
             with e ->
                 stopProcessingRecovery e range0
                 null
  
  