There are mails of mccarthy's team discussing upward funargs and lexical scoping in 59 (maybe 58, I don't recall). The very first to do it publicly might have b

There are mails of mccarthy's team discussing upward funargs and lexical scoping in 59 (maybe 58, I don't recall). The very first to do it publicly might have been algol, but it's not clear who made it first.