So, turns out WhatsApp is build using FreeBSD and Erlang. And one of the discerning qualities of Erlang is that you can hot-swap modules. So that prompted the question: Do I want to be able to support something like this, in principle if not in practice?
I have a construct in the language which I want to compile out but which crosses module boundaries. Now what? If you cannot, or shouldn't, compile it out; you probably need to support it, possibly all the way to the runtime. Which is annoying.
How useful is Erlang hot-swapping anyway?
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