rustUsing error with context in Rust

, how can I print the line number of an error?

Using the line! macro, you can print the line number of an error in Rust. This macro is part of the std::macros module. Here is an example of how to use it:

use std::error::Error;

fn main() -> Result<(), Box<dyn Error>> {
    let x = 5;
    let y = 0;
    let z = x / y;
    println!("{}", z);
    Ok(())
}

This code will produce an error, and the line number of the error can be printed using the line! macro:

thread 'main' panicked at 'attempt to divide by zero', src/main.rs:7:9
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

Here is a breakdown of the code parts:

• use std::error::Error;: This imports the Error trait from the std::error module.
• let x = 5;: This creates a variable x with the value 5.
• let y = 0;: This creates a variable y with the value 0.
• let z = x / y;: This creates a variable z with the value of x divided by y.
• println!("{}", z);: This prints the value of z to the console.
• Ok(()): This returns an Ok result with an empty tuple.
• thread 'main' panicked at 'attempt to divide by zero', src/main.rs:7:9: This is the output of the line! macro, which prints the line number of the error (in this case, line 7).

External Links:

• Rust Documentation - Macros
• Rust Documentation - Error Handling

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