anchor.diff:      Node#c_apply.args.
   
   
  -%% @spec apply_arity(Node::cerl()) -> integer()
  +%% @spec apply_arity(Node::cerl()) -> arity()
   %%
   %% @doc Returns the number of argument subtrees of an abstract
   %% function application.
  
positive.code: %% @see c_primop/2
  %% @see primop_args/1
  
  -spec primop_arity(c_primop()) -> non_neg_integer().
  
  primop_arity(Node) ->
      length(primop_args(Node)).
  
negative.code:     Node#c_primop.args.
  
  
  %% @spec primop_arity(Node::cerl()) -> arity()
  %%
  %% @doc Returns the number of argument subtrees of an abstract
  %% primitive operation call.
  