Why do try!() and ? not compile when used in a function that doesn't return Option or Result?

Question

Why does this code not compile?

use std::{fs, path::Path};

fn main() {
    let dir = Path::new(\"../FileSystem\");

    if !dir.is_dir() {
        println!(         


        

Answer 1

The ques_in_main RFC got merged recently. Once it's completed, the syntax in the question will indeed compile just fine and work as intended, provided the try!() calls are replaced with the ? operator.