On 10月30日, 上午8时03分, metal <metal...@gmail.com> wrote:
> The actual situation is I'm coding with a immuable set-like datatype
> XSet which supports XSet(['al']) & XSet(['ah'] = XSet(['ax'] if I
> declare ax is consists of al and ah
>

A typo,  XSet(['al']) | XSet(['ah'] = XSet(['ax']
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