anchor.diff:          Exp = lfe_eval:apply(Def1, [Args,Env], Env),
           {yes,Exp,St1}
       catch
  +        %% error:no_Error -> boom
  +        %% error:Error ->
  +        %%     Stack = erlang:get_stacktrace(),
  +        %%     erlang:error({expand_macro,[Mac|Args],{Error,Stack}})
           error:Error ->
               Stack = erlang:get_stacktrace(),
  -            erlang:error({expand_macro,[Mac|Args],{Error,Stack}})
  +            erlang:raise(error, {expand_macro,[Mac|Args],Error}, Stack)
  +        %% error:Error ->
  +        %%     Stack0 = erlang:get_stacktrace(),
  +        %%     Stack1 = trim_stacktrace(Stack0),
  +        %%     erlang:error({expand_macro,[Mac|Args],{Error,Stack1}})
       end.
   
   %% exp_predef_macro(Call, Env, State) -> {yes,Exp,State} | no.
  
positive.code:     try
          exp_predef(Call, Env, St)
      catch
          error:Error ->
              Stack = erlang:get_stacktrace(),
              erlang:error({expand_macro,Call,{Error,Stack}})
      end.
  
  %% exp_predef(Form, Env, State) -> {yes,Form,State} | no.
  %%  Handle the builtin predefined macros but only one at top-level and
  
negative.code:     %% can't handle splicing!
      case exp_backquote(tuple_to_list(X), N) of
          [list|Es] -> [tuple|Es];                %No splicing
          [cons|_]=E -> [list_to_tuple,E];        %Have splicing
          [] -> [tuple]                           %The empty tuple
      end;
  exp_backquote(X, N) when ?IS_MAP(X) ->
      %% Splicing at top-level almost meaningless here, with [list|...]
      %% we have no splicing, while with [cons|...] we have splicing
      case exp_bq_map_pairs(maps:to_list(X), N) of
          [list|KVs] -> [map|KVs];                %No splicing
          %% [cons|_]=E ->                        %Have splicing
          %%      [call,?Q(maps),?Q(from_list)|E];
          [] -> [map]                             %The empty map
      end;
  exp_backquote(X, _) when is_atom(X) -> [quote,X];
  exp_backquote(X, _) -> X.                       %Self quoting
  
  