Something I've been wondering about lately is how much language developers get to code in their actual language. Perhaps if things get really really far along, the language interpreter/compiler/runtime/whatever becomes self-hosting. But I suspect many languages never actually get that far. I was just thinking about the fact that maybe most language developers today still code in C (I have no idea if this is actually true). Perhaps in the future they will code in Rust or Go.
He does briefly speak to part of this point:
> I don't think I'd change anything in them except to emphasise more that a programming language is a Human-Computer-Interface and the language designer should design for the users of the language, not just for himself or herself.
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I personally have never used Rexx. But I remember many years ago I made an attempt to sign up for an OS/2 Warp beta and being shocked when I actually got picked. I recall installing it and the OS contained what was the first instance I had seen of some sort of voice control for computers. Even at the time my IBM PS/2 (a 386sx running at 20MHz) was at the low end of the requirements for OS/2 Warp and the system didn't perform very well at all. But I have a memory of speaking something like "Computer: Go to sleep!" and my brother laughing at me and repeating it from time-to-time after that, long after I'd uninstalled OS/2 and went back to Windows 3.11 or DOS or whatever I was running in those days.