code: def p_pointer_pointer(self, p):
          'pointer : pointer LBRACKET expression RBRACKET'
          p[0] = Pointer(p[1], p[3], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1)f p_pointer_pointer(self, p):
          'pointer : pointer LBRACKET expression RBRACKET'
          p[0] = Pointer(p[1], p[3], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1))
docs: pointer : pointer LBRACKET expression RBRACKET