Rust Top error list in 2024 and 25

 

Here is a list of common errors and issues you may encounter when working with the Rust programming language, along with brief descriptions:

1. Syntax and Parsing Errors

• E0308 (Mismatched Types): Occurs when the types expected by the compiler do not match the types provided (e.g., expecting i32 but getting &str).
• E0425 (Unresolved Name): The code references an identifier that the compiler cannot find.
• E0609 (No Field): The code attempts to access a field on a type that doesn't have it.
• E0433 (Unresolved Import): The code tries to import something that isn't in scope or doesn't exist.

2. Ownership and Borrowing Errors

• E0382 (Use of Moved Value): Occurs when trying to use a value after it has been moved.
• E0499 (Mutable Borrow Conflicts): Occurs when attempting to borrow a variable as mutable more than once simultaneously.
• E0502 (Borrow and Mutable Borrow): Happens when borrowing an immutable reference while a mutable reference is still active.
• E0507 (Cannot Move Out of Borrowed Content): This error occurs when trying to move data from a structure that is only borrowed.
• E0596 (Cannot Borrow as Mutable): The variable is not mutable, but the code attempts to mutate it.

3. Lifetime and Reference Errors

• E0106 (Missing Lifetime Specifier): Occurs when the lifetime of a reference is not specified.
• E0495 (Lifetime of Borrowed Reference): The compiler detects that the borrowed reference does not live long enough.
• E0621 (Explicit Lifetime Required): The code needs explicit lifetime annotations to resolve borrowing issues.

4. Type and Trait Errors

• E0277 (Trait Not Implemented): Occurs when trying to use a type that does not implement a required trait.
• E0412 (Undefined or Unimplemented Type): The code refers to a type that is undefined or not in scope.
• E0599 (Method Not Found): A method is called on a type that doesn't implement it.
• E0308 (Type Mismatch): The type of value in the expression does not match the expected type.
• E0369 (Cannot Add/Subtract, etc.): The type used in an arithmetic operation does not support that operation.

5. Compilation and Build Errors

• Linker Errors: Usually due to missing external libraries or incorrect linking configurations.
• E0463 (Can't Find Crate for X): Rust cannot locate a crate needed for the project.
• E0583 (File Not Found for Module): The file path for a module is incorrect or missing.

6. Runtime Errors

• Panic!: Indicates that the program encountered an unrecoverable state and called the panic! macro.
• Thread 'main' panicked at 'explicit panic': An explicit call to panic! was made, possibly due to failed assertions or unexpected conditions.
• Unwrap on None: The .unwrap() method was called on an Option with None, causing a runtime panic.
• Unwrap on Err: The .unwrap() method was called on a Result that contained Err.

7. Concurrency Errors

• E0373 (Captured Variable Outlives Closure): Occurs when a variable is used inside a closure but doesn't meet lifetime requirements.
• Data Races: Potentially occurs when mutable and immutable references are accessed simultaneously in unsafe code.
• Deadlock: When concurrent threads are waiting for resources that prevent each other from progressing.

8. Macro and Procedural Errors

• Macro Expansion Errors: Occurs when a macro invocation doesn't match its definition.
• E0658 (Feature Not Available): The code uses a feature that is not stable and requires a #![feature] attribute to be activated.

9. Conditional Compilation Errors

• E0432 (Undefined Preprocessor Attributes): Occurs when conditional compilation attributes (#[cfg()]) reference undefined conditions.

10. Cargo and Package Errors

• Cargo.toml Parsing Errors: Syntax issues or missing keys in Cargo.toml.
• Version Mismatch: The dependency version in Cargo.toml conflicts with other packages.
• Cargo Locking Issues: Multiple cargo processes trying to modify Cargo.lock simultaneously.
• Build Script Failures: Custom build scripts (e.g., build.rs) can fail due to incorrect configurations or missing dependencies.

11. Memory Safety and Unsafe Code Errors

• Dereferencing Null Pointers: Using raw pointers incorrectly in unsafe code.
• Undefined Behavior: Occurs when code using unsafe leads to non-deterministic behavior.
• E0133 (Use of Unsafe Function or Block): When an operation is unsafe but isn't enclosed within an unsafe block.

12. Documentation and Annotation Errors

• E0601 (Main Function Not Found): Occurs when the entry point (fn main()) is missing.
• Attribute Errors: Misuse or misplacement of attributes like #[derive()], #[test], or #[cfg()].

13. Miscellaneous Errors

• E0004 (Non-Exhaustive Pattern Match): A match statement does not cover all possible cases.
• E0080 (Constant Evaluation Error): Occurs during compile-time evaluation of const or static expressions.
• E0428 (Duplicate Definition): When there is a duplicate item or function definition.
• E0659 (Ambiguous Name): Occurs when an identifier has multiple possible interpretations.

14. Formatting and Style Errors

• Clippy Lints: Warnings from the clippy tool, which suggest idiomatic improvements to Rust code.
• Rustfmt Warnings: Formatting issues flagged by rustfmt.

These errors cover a broad range of issues developers may encounter when using Rust. Understanding and addressing these errors can help ensure smooth development and better application performance.