Yeah, in R6RS square brackets are considered to be perfectly interchangeable wit... | Hacker News

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tmtvl on Nov 26, 2022 | parent | context | favorite | on: A few examples of Lisp code typography (2013)

Yeah, in R6RS square brackets are considered to be perfectly interchangeable with regular parentheses. That decision was reversed for R7RS-small, though.

_19qg on Nov 26, 2022 [–]

It's much older. Here is a (legendary) paper on Lisp using Scheme with square brackets from 1983.

https://dl.acm.org/doi/pdf/10.1145/800017.800513

Interlisp used it in the 70 already.

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