Rust Advanced Quiz 2
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Practice Pronunciation (Merriam-Webster)
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Quiz 2
1. Why use 'MaybeUninit<T>' instead of 'mem::uninitialized'?
It provides a highly optimized execution path for large stack-allocated arrays
It reduces the total stack footprint by reusing existing memory address spaces
It avoids immediate Undefined Behavior by informing the compiler the data is potentially invalid
2. What does '#[repr(C)]' guarantee?
The struct will be compressed
The memory layout will be compatible with C
All fields will be made public
3. What is 'Trait Coherence'?
The rule that ensures there is only one implementation of a trait for a type
The capability for multiple traits to call one another within a single module
A compiler-level method used for optimizing dynamic trait lookups at runtime
4. What is 'Ordering::SeqCst' in atomics?
A constant that forces operations to follow a linear sequential path
A control mechanism used to manage segmented memory access patterns
Sequentially Consistent ordering (the strongest guarantee available)
5. Which of these uses a vtable?
fn func<T: Trait>(t: T)
fn func(t: &dyn Trait)
fn func(t: Struct)
6. What is the 'Drop Checker'?
A compiler component that ensures dropped values don't access invalid references
A diagnostic tool used to scan for memory leaks within long-running processes
A specialized macro designed to manually deallocate data from the system heap
7. What is a 'Procedural Macro'?
A specialized macro that only executes within procedural function definitions
A performance-optimized version of a standard declarative macro definition
A Rust function that takes code as input and produces code as output
8. What is 'Macro Hygiene'?
Macros not interfering with identifiers in the caller's scope
Ensuring that macro code remains properly formatted and readable
The automated deletion of unused macros during the build process
9. What is the significance of 'UnsafeCell<T>'?
It automatically grants thread-safety to any internal data type
It is the only core primitive for achieving interior mutability
It is a specialized container used strictly for storing null pointers
10. What is a 'Zero Sized Type' (ZST)?
A type that has been deleted
An integer with value 0
A type whose instances occupy zero bytes of memory
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