src/test/ui/packed/packed-struct-borrow-element.rs


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

// run-pass (note: this is spec-UB, but it works for now)
#![allow(dead_code)]
// ignore-emscripten weird assertion?

#[repr(packed)]
struct Foo1 {
    bar: u8,
    baz: usize
}

#[repr(packed(2))]
struct Foo2 {
    bar: u8,
    baz: usize
}

#[repr(C, packed(4))]
struct Foo4C {
    bar: u8,
    baz: usize
}

pub fn main() {
    let foo = Foo1 { bar: 1, baz: 2 };
    let brw = unsafe { &foo.baz };
    assert_eq!(*brw, 2);

    let foo = Foo2 { bar: 1, baz: 2 };
    let brw = unsafe { &foo.baz };
    assert_eq!(*brw, 2);

    let foo = Foo4C { bar: 1, baz: 2 };
    let brw = unsafe { &foo.baz };
    assert_eq!(*brw, 2);
}