Edition 2024 practice problems in Rust

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Title	Difficulty	Category	Tags
Boxed errors and downcasting	Medium	Primitives
Calling C functions through safe Rust wrappers	Medium	Framework
Classify syntax with macro fragment specifiers	Medium	Primitives
Combine pattern matches with let-chains	Medium	Primitives
Edition 2024: unsafe extern blocks and safe declarations	Medium	Framework
Export Rust functions with C-compatible names and signatures	Hard	Framework
Follow-set rules: why the compiler rejects your matcher	Hard	Primitives
ref, ref mut, and default binding modes in edition 2024	Medium	Primitives
Release a read guard before acquiring a write lock	Hard	Framework
Returning impl Trait, and what edition 2024 changed	Hard	Primitives
static mut and the edition-2024 wall	Medium	Framework
`static mut` is dead: what edition 2024 changed	Medium	Primitives
`unsafe {}` vs `unsafe fn`: edition 2024 splits the two meanings	Easy	Primitives