anchor.diff:      end.
   
   defined(F, A, St) ->
  -    ordsets:is_element({F,A}, St#expand.defined).
  +    gb_sets:is_element({F,A}, St#expand.defined).
  
positive.code:                  compile=[],                    %Compile flags
                   attributes=[],                 %Attributes
                   callbacks=[],                  %Callbacks
                   defined=[],                    %Defined functions
                   vcount=0,                      %Variable counter
                   func=[],                       %Current function
                   arity=[],                      %Arity for current function
  
negative.code:     F = {function,0,Name,A,[{clause,0,Args,[],Body}]},
      NA = {Name,A},
      {[F|Fs],St#expand{exports=add_element(NA, St#expand.exports),
  		      defined=gb_sets:add_element(NA, St#expand.defined)}}.
  
  %% define_function(Form, State) -> State.
  %%  Add function to defined if form is a function.
  