Rust Advanced Quiz 5
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Practice Pronunciation (Merriam-Webster)
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1. What is 'std::hint::black_box' used for?
Securing and storing cryptographic private keys within a hardware module
Capturing and debugging incoming network traffic for low-level diagnostic logs
Preventing the compiler from optimizing away code during benchmarks
2. Which types are 'Unpin' by default?
No types are Unpin and must be manually marked by the developer in the code
Most types that aren't self-referential (like i32, String, and standard vecs)
Only types stored on the heap that are managed by the global memory allocator
3. What is 'Link-Time Optimization' (LTO)?
An optimization phase that looks across all crates in a dependency graph
A protocol for connecting to an external database during the runtime phase
A sorting algorithm used to organize the final output of a generic list type
4. Why is a slice reference (&[T]) 16 bytes on a 64-bit system?
Because the system treats every slice reference as a double-precision integer
Because the compiler enforces strict 16-byte memory alignment for all slices
Because it stores an 8-byte data address and a corresponding 8-byte length
5. Does 'unsafe' turn off the borrow checker?
Yes, it completely disables all safety checks for the entire compilation unit
No, it only allows specific unsafe actions; other rules still strictly apply
It only disables checks when dereferencing raw pointers within the unsafe block
6. What is a 'Dangling Pointer'?
A pointer that refers to memory that has been freed and is no longer valid
A pointer that is initialized to zero and cannot be used for memory access
A pointer that specifically targets a function address in the text segment
7. What is 'Lock Contention'?
A logical conflict where two separate threads attempt to delete the same data
A hardware-level error that occurs when a physical memory lock is bypassed
A performance loss that occurs when multiple threads wait for the same lock
8. What does 'std::ptr::read' do?
It opens and reads the contents of a local file into a new string buffer
It bitwise-copies a value from a pointer without dropping the original data
It prints the hexadecimal memory address of a pointer to the standard output
9. What is 'Constant Evaluation'?
The compiler executing code during the build process to generate final results
A verification step that checks if a variable is marked as a constant type
A mathematical optimization used to speed up complex trigonometric functions
10. What is the meaning of the '?Sized' bound?
The type must have a fixed size that is known to the compiler at compile time
The type has a size that is completely unknown until the program is executed
The type might be sized or unsized as it opts out of the default Sized bound
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