I actually think this is a great example of PL design process. "pure fn" died because we didn't know what it was for and couldn't decide on the semantics. Once it became clear why we wanted "const fn", "pure fn" basically came back, b/c we knew what the constraints were.
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Replying to @pcwalton and @ian
but we fought that fight like ten years ago! haha (speaking of which, the loss of the maililng list archives on the web makes it *really* hard to find that discussion)
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