code: def p_ifdef_else_b(p):
      
      global ENABLED
  
      if ENABLED:
          p[0] = ['#line %i "%s"%s' % (p.lineno(1) + 1, CURRENT_FILE[-1], p[2])]
          p[0] += p[3]
      else:
          p[0] = []
docs: ifdefelseb : ELSE NEWLINE program