John McCarthy had the opposite experience: he originally planned to replace Lisp's S-expressions with a more ALGOL-like syntax called M-expressions, but other p

John McCarthy had the opposite experience: he originally planned to replace Lisp's S-expressions with a more ALGOL-like syntax called M-expressions, but other people liked S-expressions and he never got around to implementing M-expressions. https://en.wikipedia.org/wiki/M-expression https://en.wikipedia.org/wiki/M-expression