The ‘normal’ way to redefine words in forth is a bit of cheating, though. Redefining a word merely introduces a word with a name that shadows that of the old, still existing word.

Words created before the definition still call the old implementation, and, depending on the implementation (a phrase that, I think applies to about any statement about forth) you can still find it when you walk the dictionary and call it.

Smalltalk is missing too, and that’s a bigger omission. When you redefine a function there, it starts getting used everywhere.

I wonder what a blog post written about this 50 years from now will look like. Would it still mention C and lisp? Would readers of said article still mention forth and smalltalk as missing? Also, what reasonably successful languages from the ‘60s/‘70s already are gone from the collective mind?

Being used today to write very popular OSes, I see C still being mentioned, but by then lisp might have fallen into the abyss of history (except for, probably, a few computer historians)