A return statement was found outside of a function body.
Erroneous code example:
```compile_fail,E0572
const FOO: u32 = return 0; // error: return statement outside of function body
fn main() {}
```
To fix this issue, just remove the return keyword or move the expression into a
function. Example:
```
const FOO: u32 = 0;
fn some_fn() -> u32 {
return FOO;
}
fn main() {
some_fn();
}
```