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R5RS supports reader macros? Which would be 1998, and I guess only 28 years ago.

That's why SRFI-49 and its descendants were a possibility. Wisp, JavaScript, brainfuck, etc. implementations all exist because the tools exist in the language.



It does not. https://conservatory.scheme.org/schemers/Documents/Standards... Particular implementations could.


That document, shows several forms:

https://conservatory.scheme.org/schemers/Documents/Standards...


Common Lisp reader macros hook into the reader itself as it's parsing S-exps and meets some character combination: http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec... Define-syntax is for making special forms (i.e. normal macros).

Not that I know why eval should be paired with reader macros.




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