docs: def p_configure_sentence(self, t):
          """configure_sentence : CONFIGURE VAR
                                | CONFIGURE VAR LPAREN RECIPE_BEGIN recipe RECIPE_END RPAREN"""
  
          if len(t) == 3:
              t[0] = configure(t[2], reference=True, line=t.lineno(1))
          else:
              t[0] = configure(t[2], t[5], line=t.lineno(1))