Some BCPL dialects/implementations used underscore instead of := for assignment. MUD 1 was written in such a dialect, see e.g. [0]; also, note that it allowed the use of "." in identifiers.
replyhang about, the smalltalk return operator is why objc block syntax uses carets, isn't it? how did that only just click for me?
replyHard to tell from a short comment, and maybe you already know, but a lot of obj-c is derived from smalltalk.
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