code: def p_lpartselect_lpointer(self, p):
          'lpartselect : pointer LBRACKET expression COLON expression RBRACKET'
          p[0] = Partselect(p[1], p[3], p[5], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1)f p_lpartselect_lpointer(self, p):
          'lpartselect : pointer LBRACKET expression COLON expression RBRACKET'
          p[0] = Partselect(p[1], p[3], p[5], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1))
docs: lpartselect : pointer LBRACKET expression COLON expression RBRACKET