Rust Panic Handling: Mastering Error Management in Your Code

Introduction

In this lab, we learn about the error handling mechanism panic in Rust. It is a simple mechanism that prints an error message, unwinds the stack, and usually exits the program. The lab provides an example where panic is explicitly called when the beverage is "lemonade".

Note: If the lab does not specify a file name, you can use any file name you want. For example, you can use main.rs, compile and run it with rustc main.rs && ./main.

Skills Graph

%%%%{init: {'theme':'neutral'}}%%%% flowchart RL rust(("Rust")) -.-> rust/MemorySafetyandManagementGroup(["Memory Safety and Management"]) rust(("Rust")) -.-> rust/ErrorHandlingandDebuggingGroup(["Error Handling and Debugging"]) rust(("Rust")) -.-> rust/DataTypesGroup(["Data Types"]) rust(("Rust")) -.-> rust/FunctionsandClosuresGroup(["Functions and Closures"]) rust/DataTypesGroup -.-> rust/string_type("String Type") rust/FunctionsandClosuresGroup -.-> rust/function_syntax("Function Syntax") rust/FunctionsandClosuresGroup -.-> rust/expressions_statements("Expressions and Statements") rust/MemorySafetyandManagementGroup -.-> rust/lifetime_specifiers("Lifetime Specifiers") rust/ErrorHandlingandDebuggingGroup -.-> rust/panic_usage("panic! Usage") subgraph Lab Skills rust/string_type -.-> lab-99231{{"Rust Panic Handling Example"}} rust/function_syntax -.-> lab-99231{{"Rust Panic Handling Example"}} rust/expressions_statements -.-> lab-99231{{"Rust Panic Handling Example"}} rust/lifetime_specifiers -.-> lab-99231{{"Rust Panic Handling Example"}} rust/panic_usage -.-> lab-99231{{"Rust Panic Handling Example"}} end

panic

The simplest error handling mechanism we will see is panic. It prints an error message, starts unwinding the stack, and usually exits the program. Here, we explicitly call panic on our error condition:

fn drink(beverage: &str) { // You shouldn't drink too much sugary beverages. if beverage == "lemonade" { panic!("AAAaaaaa!!!!"); } println!("Some refreshing {} is all I need.", beverage); } fn main() { drink("water"); drink("lemonade"); }

Rust Panic Handling Example

Introduction

Skills Graph

`panic`

Summary