Enums practice problems in Rust

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Title	Difficulty	Category	Tags
Build a configuration from defaults and overrides	Easy	Primitives
Decode bytes into enum variants	Medium	Primitives
Destructuring structs and nested patterns	Medium	Primitives
Enum state machines with data-carrying transitions	Hard	End-to-End
Folding an AST: separating traversal from action	Hard	End-to-End
match and exhaustiveness: the compiler as a checklist	Easy	Primitives
Recursive types need indirection: E0072	Easy	Primitives
Reduce an enum’s inline size with Box	Medium	Primitives
Represent commands with enum variants	Easy	Primitives
The wildcard trap: `_` arms freeze your enum against the future	Medium	Primitives