anchor.diff:      File = erlcinfo_file(),
       ok = filelib:ensure_dir(File),
       Data = term_to_binary(#erlcinfo{info={Vs, Es, InclDirs}}, [{compressed, 9}]),
  -    file:write_file(File, Data).
  +    ok = file:write_file(File, Data).
   
   %% NOTE: If, for example, one of the entries in Files refers to
   %% gen_server.erl, that entry will be dropped. It is dropped because
  
positive.code:     digraph:add_vertex(G, Source, LastUpdated),
      lists:foreach(
        fun(Incl) ->
                update_erlcinfo(G, Incl, Dirs),
                digraph:add_edge(G, Source, Incl)
        end, AbsIncls).
  
  restore_erlcinfo(G, InclDirs) ->
      case file:read_file(erlcinfo_file()) of
  
negative.code:             ok
      end.
  
  store_erlcinfo(G, InclDirs) ->
      Vs = lists:map(
             fun(V) ->
                     digraph:vertex(G, V)
  