Users are increasingly cynical of "only N still available" messages trying to persuade you to buy:
miniblog.
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I'm adding a += operator to my programming language, because writing `x = x + 1` is tedious.
This opens the tricky design question of which operators should support this. Is += and -= sufficient, or do you expect things like >>= and **= to be available?
Coming from JS or Python, imports in Rust feel weird. They're entirely optional aliases for fully qualified symbols, which are always available.
I don't know of many other languages where you can just start using libraries. Java is the only one I can think of.
The book 'The Art of the Metaobject Protocol' has two chapters in the public domain and available online!
Chapter 5: Concepts
Chapter 6: Generic Functions and Methods