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I feel like a cross platform Swift GUI would be a great thing for the world. Swift strikes a great balance between ergonomics and performance, and seems to be the only other mainstream language to have absorbed some of Rust's key features around borrowing references.

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For the record, borrowed references are only going to be really usable in Swift 6 which isn't released yet.

That said, Swift's implementation of borrowing seems significantly more user-friendly than Rust's. While this is very much an advanced feature, I'd expect it to be actually used in many cases where in Rust folks would resort to working around the borrow checking (via things like indexing into arrays and such). As a result I expect it to be significantly more useful.

Browser Company sort of built this themselves for Arc, but its really a separate SwiftUI-like Windows implementation (Windows UI is separate code written in a similar style). It still feels like a technical preview though unfortunately.

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