If only there was a language that let you modify the interpreter on the fly so you could do this as part of normal execution...
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The reason we don't have such metaprogramming available everywhere is mostly because you have to subscribe to a particular ideology to allow it. If you think programmers are generally intelligent and responsible, you put macros and metaclasses in your language. If, on the other hand, you think most programmers are dumb code monkeys (with a few exceptions, maybe) your language becomes like early Java or early Go.