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I'm rewriting a Rust function transform function from `&mut Foo` to `Foo -> Foo`. It might be a little slower, but ownership makes it harder to miss parts of the Foo type when I work with values.
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The thing about memory ownership is that it's intrinsic (not incidental) complexity on a physical computer. If you don't want GC, you need ownership.
Not all languages provide ownership tooling though (e.g. C). Following Rust's success I suspect we'll see more ownership tools. https://twitter.com/migueldeicaza/status/1103427307451035648
Persistent data types and how Rust's ownership model subsumes a surprising number of their use cases:
The Swift team are discussing a Rust/Cyclone style ownership system! https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20170213/032155.html (opt-in and an interesting dynamic enforcement)