Define Error Handling
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Borrowing 4.10. Lifetimes 4.11. Mutability 4.12. Structs 4.13. Enums 4.14. Match 4.15. Patterns 4.16. Method Syntax 4.17. Strings 4.18. Generics 4.19. Traits 4.20. Drop 4.21. if let https://doc.rust-lang.org/book/error-handling.html 4.22. Trait Objects 4.23. Closures 4.24. Universal Function Call Syntax 4.25. Crates and Modules 4.26. `const` and `static` 4.27. Attributes 4.28. `type` aliases 4.29. Casting between types 4.30. Associated Types 4.31. Unsized Types 4.32. Operators and Overloading 4.33. Deref coercions 4.34. Macros 4.35. Raw Pointers 4.36. `unsafe` 5. Effective Rust 5.1. The Stack and the Heap 5.2. Testing 5.3. Conditional Compilation error handling 5.4. Documentation 5.5. Iterators 5.6. Concurrency 5.7. Error Handling 5.8. Choosing your Guarantees 5.9. FFI 5.10. Borrow and AsRef 5.11. Release Channels 5.12. Using Rust without the standard library 6. Nightly Rust 6.1. Compiler Plugins 6.2. Inline Assembly 6.3. No stdlib 6.4. Intrinsics 6.5. Lang items 6.6. Advanced linking 6.7. Benchmark Tests 6.8. Box Syntax and Patterns 6.9. Slice Patterns 6.10. Associated define error in Constants 6.11. Custom Allocators 7. Glossary 8. Syntax Index 9. Bibliography Error Handling Like most programming languages, Rust encourages the programmer to handle errors in a particular way. Generally speaking, error handling is divided into two broad categories: exceptions and return values. Rust opts for return values. In this section, we intend to provide a comprehensive treatment of how to deal with errors in Rust. More than that, we will attempt to introduce error handling one piece at a time so that you'll come away with a solid working knowledge of how everything fits together. When done naïvely, error handling in Rust can be verbose and annoying. This section will explore those stumbling blocks and demonstrate how to use the standard library to make error handling concise and ergonomic. Table of Contents This section is very long, mostly because we start at the very beginning with sum types and combinators, and try to motivate the way Rust does error handling incrementally. As such, programmers with experience in other expressive type systems may want to jump around. The Basics Unwrapping explained The Option type Composin