Build a Practical Structs, Enums, and Pattern Matching Example in Rust Programming Fundamentals

Define the build target

For Structs, Enums, and Pattern Matching, build a small typed program using the module feature, compile with warnings enabled, test a boundary input, and explain one compiler or runtime diagnostic. Build the boundary case using this implementation lens: Use Rust ownership, moves, borrowing, lifetimes, structs/enums, pattern matching, traits, Result/Option, Cargo, compiler diagnostics, tests, and concurrency guarantees.

Keep the Structs, Enums, and Pattern Matching build centered on these technical constraints: Source-to-build process. Types and data representation. Apply them through this path lens: Use Rust ownership, moves, borrowing, lifetimes, structs/enums, pattern matching, traits, Result/Option, Cargo, compiler diagnostics, tests, and concurrency guarantees. Use Rust ownership, moves, borrowing, lifetimes, structs/enums, pattern matching, traits, Result/Option, Cargo, compiler diagnostics, tests, and concurrency guarantees.

Implement the core behavior

Implement Structs, Enums, and Pattern Matching around the module artifact—a working structs, enums, and pattern matching exercise with a documented technical result—and keep the implementation specific to this path context: Use Rust ownership, moves, borrowing, lifetimes, structs/enums, pattern matching, traits, Result/Option, Cargo, compiler diagnostics, tests, and concurrency guarantees.

fn main() {
    let values = [4, 7, 2, 9];
    let sum: i32 = values.iter().sum();
    println!("{sum}");
}

rustc main.rs && ./main

22

practice/\n├── README.md\n├── structs-enums-and-pattern-matching-build.rs\n└── evidence/\n    └── expected-result.txt

Run the complete path

Run one realistic Structs, Enums, and Pattern Matching case end to end and record the required evidence: the module-specific command, output, test, rendered state, query result, log, or measurement that proves the exercise worked. Interpret the result through this path context: Use Rust ownership, moves, borrowing, lifetimes, structs/enums, pattern matching, traits, Result/Option, Cargo, compiler diagnostics, tests, and concurrency guarantees.

Change one meaningful condition

Modify one condition central to Structs, Enums, and Pattern Matching using this path context: Use Rust ownership, moves, borrowing, lifetimes, structs/enums, pattern matching, traits, Result/Option, Cargo, compiler diagnostics, tests, and concurrency guarantees. Predict the new result before rerunning the same workflow.

Verify the artifact

Your deliverable is a working structs, enums, and pattern matching exercise with a documented technical result.

Common mistakes to avoid

• Implicit conversion or lifetime misunderstood.
• Warning ignored.
• Data layout/ownership assumption wrong.
• Concurrent state shared without the language’s safety mechanism.