code: def p_lconcat(self, p):
          'lconcat : LBRACE lconcatlist RBRACE'
          p[0] = LConcat(p[2], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1)f p_lconcat(self, p):
          'lconcat : LBRACE lconcatlist RBRACE'
          p[0] = LConcat(p[2], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1))
docs: lconcat : LBRACE lconcatlist RBRACE