anchor.diff:  is_app_available(App, VsnRegex) ->
       case code:lib_dir(App) of
           {error, bad_name} ->
  -            false;
  +            {false, bad_name};
           Path ->
               is_app_available(App, VsnRegex, Path)
       end.
  
positive.code:                         nomatch ->
                              ?WARN("~s has version ~p; requested regex was ~s\n",
                                    [AppFile, Vsn, VsnRegex]),
                              false
                      end;
                  OtherApp ->
                      ?WARN("~s has application id ~p; expected ~p\n", [AppFile, OtherApp, App]),
                      false
              end;
          false ->
              ?WARN("Expected ~s to be an app dir (containing ebin/*.app), but no .app found.\n",
                    [Path]),
              false
      end.
  
  use_source(Dep) ->
  
negative.code:             Dir = filename:join(Dep#dep.dir, "ebin"),
              ok = filelib:ensure_dir(filename:join(Dir, "dummy")),
              true = code:add_patha(Dir);
          {false, _} ->
              true
      end,
      update_deps_code_path(Rest).
  