anchor.diff:                    description = E,
                     additional = xqerl_lib:format_stacktrace(StackTrace)}
      after
  -      erlang:erase() % TODO only erase stuff added by the execution
  +      _ = erlang:erase(),
  +      [erlang:put(K, V) || {K,V} <- OldProcDict]
      end.
   
   % returns Tokens
  
positive.code: %% @author Zack
  %% @doc @todo Add description to xqerl.
  
  
  -module(xqerl).
  
  
negative.code: %% ====================================================================
  %% API functions
  %% ====================================================================
  -export([run/1, run/2,
           compile/1]). 
  
  compile(Filename) ->
     xqerl_code_server:compile(Filename).
  
  run(Mod) -> run(Mod, #{}).
  
  