anchor.diff:  ELSE : 'else';
   FOR : 'for';
   IN : 'in';
  +NOT_IN : '!in';
   NIL : 'bil';
   TRUE : 'true';
   FALSE : 'false';
  
positive.code:  */
  
  program
   : ( NEWLINE | statement )* EOF
   ;
  
  function_definition
  
negative.code:  ;
  
  statement
   : Simple=simple_statement 
   | Compound=compound_statement
   ;
  
  simple_statement
   : First=small_statement ( ';' Succession=small_statement )* ';'? NEWLINE
   ;
  
  small_statement
  