I feel like Rust often pushes me to use concrete types.
It's a lot easier to return a Vec than an impl Iterator. It's not a big problem, but in e.g. Java I'd just say I'm returning some kind of iterator.
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Is there any relationship between language adoption and the size of its standard library?
These days it seems completely orthogonal, but early Java adopters spoke highly of the collections library compared with C++.
Maybe it's the widespread availability of package managers?
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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.