Creating an instance of enum{}

Challenge
1

How do you make the following function compile?

fn hello() enum {} {
    // ???
}
2 Likes
2

En Garde!

fn hello() enum {} {
    const T = @typeInfo(@TypeOf(hello)).Fn.return_type.?;
    const t: T = undefined;
    return t;
}

pub fn main() !void {
    _ = hello();
}

Or, even simpler!

fn hello() enum {} {
    return undefined;
}

pub fn main() !void {
    _ = hello();
}
3

You can fill // ??? with anything that does not return, such as panic.

fn hello() enum {} {
    unreachable;
}

test {
    _ = hello();
}