Attribute Macro fatal_fn 

#[fatal_fn]

An attribute macro that wraps a function’s body in the fatal! macro.

This macro allows you to specify an optional reason for the fatal error using the attribute argument.

Example

use thiserror::Error;
use impass::{fatal, fatal_fn};
 
// Declare an error type for demonstration purposes.
#[derive(Error, Debug)]
pub enum MyError {
    #[error("This operation failed")]
    OperationFailed
}

// A fallible function for demonstration.
fn might_fail(value: i32) -> Result<i32, MyError> {
    if value < 10 {
        Err(MyError::OperationFailed)
    } else {
        Ok(value * 2)
    }
}
 
// Using the `fatal_fn` macro to wrap a function.
#[fatal_fn(reason = "Critical failure in function execution")]
fn example_function() -> i32 {
    let value = might_fail(15)?;
    Ok(value)
}
 
// The above function is equivalent to:
fn example_function_actual() -> i32 {
    fatal! {
        #![reason("Critical failure in function execution")]
        let value = might_fail(15)?;
        Ok(value)
    }
}