Unsafe assignment returns empty structure

Question

I haven't quite understood how unsafe assignments works. The following code gives me some error:

fn num() -> u64 {
    1;
}

fn test() -> u64 {
    let x = unsafe {
        num();
    };
    return x;
}

The error is:

src/main.rs:37:9: 37:10 note: expected type `u64`
src/main.rs:37:9: 37:10 note:    found type `()`

My real example is similar to this one. Strange that I have the exact same code, though I cannot compile.

score 2 · Accepted Answer · edited May 23 '17 at 12:00

2

Semicolons.

fn num() -> u64 {
    1
}

fn test() -> u64 {
    let x = unsafe {
        num()
    };
    return x;
}

edited May 23 '17 at 12:00

Community

answered Aug 04 '16 at 04:22

DK.

And of course the function should not have a `return` at all: `fn test() -> u64 { unsafe { num() } }`. – Shepmaster Aug 04 '16 at 20:50
That's a question of style, not correctness or morality. – DK. Aug 04 '16 at 22:42
I'm more than happy to dispense suggestions of style (and morality) as gospel. Besides, Clippy agrees with me . – Shepmaster Aug 04 '16 at 22:45

1 Answers1