Quiz 1
1. What are 'Higher-Rank Trait Bounds' (HRTBs) used for?
2. What does 'Variance' refer to in Rust's type system?
3. What is the primary purpose of 'Pin<P>'?
4. What is 'PhantomData<T>' used for?
5. What is a major restriction of 'std::mem::transmute'?
6. What improvement did 'Non-Lexical Lifetimes' (NLL) bring?
7. How do you switch the default memory allocator in a Rust binary?
8. What is 'SIMD' in the context of Rust performance?
9. What does a 'fat pointer' in Rust contain?
10. What is a 'Re-entrant' Mutex?
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