anchor.diff:  		  S -> [list_prefix(T), [S]]
   		end;
   	    list_comp ->
  -		[[list_comp_template(T)], list_comp_body(T)];
  -	    macro ->
  -		case macro_arguments(T) of
  -		  none -> [[macro_name(T)]];
  -		  As -> [[macro_name(T)], As]
  +                    [[list_comp_template(T)], list_comp_body(T)];
  +            macro ->
  +                    case macro_arguments(T) of
  +                    none -> [[macro_name(T)]];
  +                    As -> [[macro_name(T)], As]
   		end;
  -	    match_expr ->
  +            map_expr ->
  +                    case map_expr_argument(T) of
  +                        none ->
  +                            [map_expr_fields(T)];
  +                        V ->
  +                            [[V], map_expr_fields(T)]
  +                    end;
  +            map_field_assoc ->
  +                    [[map_field_assoc_name(T)],
  +                     [map_field_assoc_value(T)]];
  +            map_field_exact ->
  +                    [[map_field_exact_name(T)],
  +                     [map_field_exact_value(T)]];
  +            match_expr ->
   		[[match_expr_pattern(T)], [match_expr_body(T)]];
   	    module_qualifier ->
   		[[module_qualifier_argument(T)],
  
positive.code: 	 list_head/1, list_length/1, list_prefix/1,
  	 list_suffix/1, list_tail/1, macro/1, macro/2,
  	 macro_arguments/1, macro_name/1, make_tree/2,
  	 match_expr/2, match_expr_body/1, match_expr_pattern/1,
  	 meta/1, module_qualifier/2, module_qualifier_argument/1,
  	 module_qualifier_body/1,
           named_fun_expr/2,
  	 named_fun_expr_arity/1,
  	 named_fun_expr_clauses/1,
  	 named_fun_expr_name/1,
           map_elements/1,
           map_field_elements/1,
           nil/0, normalize_list/1,
  	 operator/1, operator_literal/1, operator_name/1,
  	 parentheses/1, parentheses_body/1,
  
negative.code: 		revert_list(Node);
  	     list_comp -> 
  		revert_list_comp(Node);
               map_expr ->
                  revert_map_expr(Node);
               map_field_assoc ->
                  revert_map_field_assoc(Node);
               map_field_exact ->
                  revert_map_field_exact(Node);
  	     match_expr -> 
  		revert_match_expr(Node);
               named_fun_expr ->
  