rust/tests/run-pass/packed_struct.rs

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#![allow(dead_code)]
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#[repr(packed)]
struct S {
a: i32,
b: i64,
}
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#[repr(packed)]
struct Test1<'a> {
x: u8,
other: &'a u32,
}
#[repr(packed)]
struct Test2<'a> {
x: u8,
other: &'a Test1<'a>,
}
fn test(t: Test2) {
let x = *t.other.other;
assert_eq!(x, 42);
}
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fn main() {
let mut x = S {
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a: 42,
b: 99,
};
let a = x.a;
let b = x.b;
assert_eq!(a, 42);
assert_eq!(b, 99);
// can't do `assert_eq!(x.a, 42)`, because `assert_eq!` takes a reference
assert_eq!({x.a}, 42);
assert_eq!({x.b}, 99);
x.b = 77;
assert_eq!({x.b}, 77);
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test(Test2 { x: 0, other: &Test1 { x: 0, other: &42 }});
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}