1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
#![feature(offset_of, extern_types)]
use std::mem::offset_of;
struct Alpha {
x: u8,
y: u16,
z: [u8],
}
trait Trait {}
struct Beta {
x: u8,
y: u16,
z: dyn Trait,
}
extern {
type Extern;
}
struct Gamma {
x: u8,
y: u16,
z: Extern,
}
struct Delta<T: ?Sized> {
x: u8,
y: u16,
z: T,
}
fn main() {
offset_of!(Alpha, z); //~ ERROR the size for values of type
offset_of!(Beta, z); //~ ERROR the size for values of type
offset_of!(Gamma, z); //~ ERROR the size for values of type
offset_of!((u8, dyn Trait), 0); // ok
offset_of!((u8, dyn Trait), 1); //~ ERROR the size for values of type
}
fn delta() {
offset_of!(Delta<Alpha>, z); //~ ERROR the size for values of type
offset_of!(Delta<Extern>, z); //~ ERROR the size for values of type
offset_of!(Delta<dyn Trait>, z); //~ ERROR the size for values of type
}
fn generic_with_maybe_sized<T: ?Sized>() -> usize {
offset_of!(Delta<T>, z) //~ ERROR the size for values of type
}
|
