anchor.diff:  
   
       AddOptions = [
  -		  {builtins, false}, 
  -		  {recurse, false}, 
  -		  {verbose, true}, 
  +		  {builtins, false},
  +		  {recurse, false},
  +		  {verbose, true},
   		  {warnings, true}
   		 ],
   
  -    %% tell xref where to look for modules to check    
  -    Res = xref:add_directory(Xref, ".", [{recurse, true}]), 
  +    %% tell xref where to look for modules to check
  +    Res = xref:add_directory(Xref, ".", [{recurse, true}]),
       io:format("add_directory: ~n~p~n", [Res]),
  -    
  +
   
   
       %% determine which properties to check with xref
  
positive.code: %% > erl
  %% 1> xref_test:run().
  %%
  %% in the source directory, but should also work in the build 
  %% directory using the yxa Makefile to compile it.
  %%--------------------------------------------------------------------
  
  
negative.code: %%--------------------------------------------------------------------
  run() ->
  
      Xref = foobar,
  
      %% stop any old xref process
      try xref:stop(Xref)
  