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Rust is a systems programming language focused on three goals: safety, speed, and concurrency. It maintains these goals without needing a garbage collector, making it a useful language for a number of use cases other languages aren't good at: embedding in other languages, programs with specific space and time requirements, and writing low-level code, like device drivers and operating systems.

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Why does Rust allow a leading `|` in or patterns?

In the code snippet found in this tweet, pattern matching is used like this: let (|x| x) = |_| Some(1); // same as `let (x | x) = |_| Some(1);` Which threw me off. Rust's pattern syntax is defined as …