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_syntax(Name, Def) ->
      case Def of
      [macro|Cls] ->
          Mcls = map(fun ([Pat|Body]) -> [[Pat,'$ENV']|Body] end, Cls),
          [Name,['match-lambda'|Mcls]];
      ['syntax-rules'|Rules] ->
          exp_rules(Name, [], Rules)
      end.
  
  %% exp_rules(Name, Keywords, Rules) -> Lambda.
  
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 ...) ...)
  