anchor.diff:      raw/1,
       simple_fun/2,
       simple_fun/3,
  -    value/1
  +    value/1,
  +    var/1
   ]).
   
   module(Name) when is_atom(Name) ->
  
positive.code: -module(tgs).
  
  -export([
      atom/1,
      call_fun/2,
      call_macro/2,
  
negative.code: 
  value(Value) ->
      erl_syntax:abstract(Value).
  
  var(Var) ->
      erl_syntax:variable(Var).
  