68 lines
1.5 KiB
Rust
68 lines
1.5 KiB
Rust
#![allow(dead_code)]
|
|
|
|
struct Foo<T: ?Sized> {
|
|
a: u16,
|
|
b: T
|
|
}
|
|
|
|
trait Bar {
|
|
fn get(&self) -> usize;
|
|
}
|
|
|
|
impl Bar for usize {
|
|
fn get(&self) -> usize { *self }
|
|
}
|
|
|
|
struct Baz<T: ?Sized> {
|
|
a: T
|
|
}
|
|
|
|
struct HasDrop<T: ?Sized> {
|
|
ptr: Box<usize>,
|
|
data: T
|
|
}
|
|
|
|
fn main() {
|
|
// Test that zero-offset works properly
|
|
let b : Baz<usize> = Baz { a: 7 };
|
|
assert_eq!(b.a.get(), 7);
|
|
let b : &Baz<Bar> = &b;
|
|
assert_eq!(b.a.get(), 7);
|
|
|
|
// Test that the field is aligned properly
|
|
let f : Foo<usize> = Foo { a: 0, b: 11 };
|
|
assert_eq!(f.b.get(), 11);
|
|
let ptr1 : *const u8 = &f.b as *const _ as *const u8;
|
|
|
|
let f : &Foo<Bar> = &f;
|
|
let ptr2 : *const u8 = &f.b as *const _ as *const u8;
|
|
assert_eq!(f.b.get(), 11);
|
|
|
|
// The pointers should be the same
|
|
assert_eq!(ptr1, ptr2);
|
|
|
|
// Test that nested DSTs work properly
|
|
let f : Foo<Foo<usize>> = Foo { a: 0, b: Foo { a: 1, b: 17 }};
|
|
assert_eq!(f.b.b.get(), 17);
|
|
let f : &Foo<Foo<Bar>> = &f;
|
|
assert_eq!(f.b.b.get(), 17);
|
|
|
|
// Test that get the pointer via destructuring works
|
|
|
|
let f : Foo<usize> = Foo { a: 0, b: 11 };
|
|
let f : &Foo<Bar> = &f;
|
|
let &Foo { a: _, b: ref bar } = f;
|
|
assert_eq!(bar.get(), 11);
|
|
|
|
// Make sure that drop flags don't screw things up
|
|
|
|
let d : HasDrop<Baz<[i32; 4]>> = HasDrop {
|
|
ptr: Box::new(0),
|
|
data: Baz { a: [1,2,3,4] }
|
|
};
|
|
assert_eq!([1,2,3,4], d.data.a);
|
|
|
|
let d : &HasDrop<Baz<[i32]>> = &d;
|
|
assert_eq!(&[1,2,3,4], &d.data.a);
|
|
}
|