Even Ruby `parser` gem uses S-expressions in their documentation: https://github.com/whitequark/parser/blob/master/doc/AST_FORMAT.md https://github.com/whitequa

Even Ruby `parser` gem uses S-expressions in their documentation: https://github.com/whitequark/parser/blob/master/doc/AST_FORMAT.md https://github.com/whitequark/parser/blob/master/doc/AST_FOR...