What's wrong with (A (B C) C D) ? For circular structures, you could also have: ... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

junke on Feb 6, 2017 | parent | context | favorite | on: Why Don't We Have a General-Purpose Tree Editor? (...

What's wrong with (A (B C) C D) ?

For circular structures, you could also have:

    '#1=(A . #1#)

Which is:

     (A A A A A A A ....)

chriswarbo on Feb 6, 2017 [–]

> What's wrong with (A (B C) C D) ?

That's a different structure: it has two Cs in it.

> For circular structures, you could also have: '#1=(A . #1#)

That's what I meant by "references".

junke on Feb 6, 2017 | [–]

> That's a different structure: it has two Cs in it.

It has two occurrences of the same C (but maybe I did not get your example).

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact