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The development experience while using the environment, the debugger, edit-compile-continue, REPL with suggestions for typos, dynamic code loading.

I should made myself clear it wasn't the programming languages grammar or semantics by themselves.

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All of that was common in MACLISP (MIT) and InterLISP (BBN) before PARC was founded. It was part of the lineage Alan talked about when founding PARC. DWIM was Teitelman’s PhD thesis (BTW his advisor was Minsky, which seems odd today but was normal back then).

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