// Define the macro.
macro_rules! log_function {
    ($f:ident($($arg:expr),*)) => {{
        println!("Calling function: {}", stringify!($f));
        $f($($arg),*)
    }};
}

// Some function for demonstration.
fn add(x: i32, y: i32) -> i32 {
    x + y
}

fn main() {
    // Use the macro.
    let result = log_function!(add(5, 7));
    println!("Result: {}", result);
}