anchor.diff:  
   exp_rules(Name, Keywords, Rules) ->
       [Name,[lambda,[args,'$ENV'],
  -       [':',lfe_macro,mbe_syntax_rules_proc,
  -        [quote,Name],[quote,Keywords],[quote,Rules],args]]].
  +           [':',lfe_macro,mbe_syntax_rules_proc,
  +            [quote,Name],[quote,Keywords],[quote,Rules],args]]].
   
   %%  By Andr� van Tonder
   %%  Unoptimized.  See Dybvig source for optimized version.
  
positive.code: 
  exp_defmacro(Name, [Args|Rest]=Def) ->
      Mcls = case is_symb_list(Args) of
             true -> exp_lambda_defmacro(Args, Rest);
             false ->
             if is_atom(Args) ->
                 [[[Args,'$ENV']|exp_drop_comment(Rest)]];
                true ->
                 exp_match_defmacro(Def)
             end
         end,
      [Name,['match-lambda'|Mcls]].
  
  exp_lambda_defmacro(Args, Rest) ->
      %% Test whether first expression is a comment string.
      [[[[list|Args],'$ENV']|exp_drop_comment(Rest)]].
  
  exp_match_defmacro(Def) ->
      Cls = exp_drop_comment(Def),
      map(fun ([Head|Body]) -> [[Head,'$ENV']|Body] end, Cls).
  
  %% exp_syntax(Name, Def) -> Lambda | MatchLambda.
  %%  N.B. New macro definition is function of 2 arguments, the whole
  
negative.code:     end.
  
  %% exp_defun(Name, Def) -> Lambda | Match-Lambda.
  %%  Educated guess whether traditional (defun name (a1 a2 ...) ...)
  %%  or matching (defun name (patlist1 ...) (patlist2 ...))
  
  exp_defun(Name, [Args|Body]=Def) ->
      case is_symb_list(Args) of
          true -> [Name,exp_lambda_defun(Args, Body)];
          false -> [Name,exp_match_defun(Def)]
      end.
  
  exp_lambda_defun(Args, Body) ->
      %% Test whether first expression is a comment string.
      ['lambda',Args|exp_lambda_body(Body)].
  
  exp_lambda_body([Comm|Rest]=Body) ->
      case io_lib:char_list(Comm) and (Rest =/= []) of
          true -> Rest;
          false -> Body
      end;
  exp_lambda_body(Body) -> Body.
  
  exp_match_defun(Body) ->
      %% Test whether first thing is a comment string.
      ['match-lambda'|exp_match_clauses(Body)].
  
  exp_match_clauses([Comm|Rest]=Body) ->
      case io_lib:char_list(Comm) of
          true -> Rest;
          false -> Body
      end;
  exp_match_clauses(Body) -> Body.
  
  %% exp_defmacro(Name, Def) -> Lambda | MatchLambda.
  %%  Educated guess whether traditional (defmacro name (a1 a2 ...) ...)
  