mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-23 23:34:48 +00:00
557 lines
12 KiB
Rust
557 lines
12 KiB
Rust
use core::mem::*;
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use core::ptr;
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#[cfg(panic = "unwind")]
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use std::rc::Rc;
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#[test]
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fn size_of_basic() {
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assert_eq!(size_of::<u8>(), 1);
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assert_eq!(size_of::<u16>(), 2);
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assert_eq!(size_of::<u32>(), 4);
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assert_eq!(size_of::<u64>(), 8);
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}
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#[test]
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#[cfg(target_pointer_width = "16")]
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fn size_of_16() {
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assert_eq!(size_of::<usize>(), 2);
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assert_eq!(size_of::<*const usize>(), 2);
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}
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#[test]
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#[cfg(target_pointer_width = "32")]
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fn size_of_32() {
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assert_eq!(size_of::<usize>(), 4);
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assert_eq!(size_of::<*const usize>(), 4);
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}
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#[test]
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#[cfg(target_pointer_width = "64")]
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fn size_of_64() {
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assert_eq!(size_of::<usize>(), 8);
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assert_eq!(size_of::<*const usize>(), 8);
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}
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#[test]
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fn size_of_val_basic() {
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assert_eq!(size_of_val(&1u8), 1);
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assert_eq!(size_of_val(&1u16), 2);
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assert_eq!(size_of_val(&1u32), 4);
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assert_eq!(size_of_val(&1u64), 8);
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}
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#[test]
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fn align_of_basic() {
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assert_eq!(align_of::<u8>(), 1);
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assert_eq!(align_of::<u16>(), 2);
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assert_eq!(align_of::<u32>(), 4);
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}
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#[test]
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#[cfg(target_pointer_width = "16")]
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fn align_of_16() {
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assert_eq!(align_of::<usize>(), 2);
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assert_eq!(align_of::<*const usize>(), 2);
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}
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#[test]
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#[cfg(target_pointer_width = "32")]
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fn align_of_32() {
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assert_eq!(align_of::<usize>(), 4);
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assert_eq!(align_of::<*const usize>(), 4);
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}
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#[test]
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#[cfg(target_pointer_width = "64")]
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fn align_of_64() {
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assert_eq!(align_of::<usize>(), 8);
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assert_eq!(align_of::<*const usize>(), 8);
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}
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#[test]
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fn align_of_val_basic() {
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assert_eq!(align_of_val(&1u8), 1);
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assert_eq!(align_of_val(&1u16), 2);
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assert_eq!(align_of_val(&1u32), 4);
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}
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#[test]
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fn align_of_val_raw_packed() {
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#[repr(C, packed)]
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struct B {
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f: [u32],
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}
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let storage = [0u8; 4];
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let b: *const B = ptr::from_raw_parts(storage.as_ptr().cast(), 1);
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assert_eq!(unsafe { align_of_val_raw(b) }, 1);
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const ALIGN_OF_VAL_RAW: usize = {
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let storage = [0u8; 4];
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let b: *const B = ptr::from_raw_parts(storage.as_ptr().cast(), 1);
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unsafe { align_of_val_raw(b) }
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};
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assert_eq!(ALIGN_OF_VAL_RAW, 1);
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}
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#[test]
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fn test_swap() {
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let mut x = 31337;
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let mut y = 42;
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swap(&mut x, &mut y);
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assert_eq!(x, 42);
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assert_eq!(y, 31337);
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}
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#[test]
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fn test_replace() {
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let mut x = Some("test".to_string());
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let y = replace(&mut x, None);
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assert!(x.is_none());
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assert!(y.is_some());
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}
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#[test]
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fn test_transmute_copy() {
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assert_eq!(1, unsafe { transmute_copy(&1) });
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}
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#[test]
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fn test_transmute_copy_shrink() {
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assert_eq!(0_u8, unsafe { transmute_copy(&0_u64) });
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}
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#[test]
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fn test_transmute_copy_unaligned() {
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#[repr(C)]
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#[derive(Default)]
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struct Unaligned {
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a: u8,
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b: [u8; 8],
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}
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let u = Unaligned::default();
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assert_eq!(0_u64, unsafe { transmute_copy(&u.b) });
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}
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#[test]
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#[cfg(panic = "unwind")]
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fn test_transmute_copy_grow_panics() {
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use std::panic;
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let err = panic::catch_unwind(panic::AssertUnwindSafe(|| unsafe {
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let _unused: u64 = transmute_copy(&1_u8);
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}));
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match err {
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Ok(_) => unreachable!(),
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Err(payload) => {
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payload
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.downcast::<&'static str>()
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.and_then(|s| {
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if *s == "cannot transmute_copy if Dst is larger than Src" {
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Ok(s)
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} else {
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Err(s)
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}
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})
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.unwrap_or_else(|p| panic::resume_unwind(p));
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}
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}
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}
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#[test]
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#[allow(dead_code)]
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fn test_discriminant_send_sync() {
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enum Regular {
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A,
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B(i32),
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}
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enum NotSendSync {
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A(*const i32),
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}
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fn is_send_sync<T: Send + Sync>() {}
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is_send_sync::<Discriminant<Regular>>();
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is_send_sync::<Discriminant<NotSendSync>>();
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}
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#[test]
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fn assume_init_good() {
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const TRUE: bool = unsafe { MaybeUninit::<bool>::new(true).assume_init() };
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assert!(TRUE);
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}
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#[test]
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fn uninit_array_assume_init() {
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let mut array = [MaybeUninit::<i16>::uninit(); 5];
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array[0].write(3);
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array[1].write(1);
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array[2].write(4);
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array[3].write(1);
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array[4].write(5);
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let array = unsafe { array.transpose().assume_init() };
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assert_eq!(array, [3, 1, 4, 1, 5]);
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let [] = unsafe { [MaybeUninit::<!>::uninit(); 0].transpose().assume_init() };
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}
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#[test]
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fn uninit_write_slice() {
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let mut dst = [MaybeUninit::new(255); 64];
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let src = [0; 64];
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assert_eq!(MaybeUninit::write_slice(&mut dst, &src), &src);
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}
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#[test]
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#[should_panic(expected = "source slice length (32) does not match destination slice length (64)")]
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fn uninit_write_slice_panic_lt() {
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let mut dst = [MaybeUninit::uninit(); 64];
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let src = [0; 32];
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MaybeUninit::write_slice(&mut dst, &src);
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}
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#[test]
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#[should_panic(expected = "source slice length (128) does not match destination slice length (64)")]
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fn uninit_write_slice_panic_gt() {
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let mut dst = [MaybeUninit::uninit(); 64];
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let src = [0; 128];
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MaybeUninit::write_slice(&mut dst, &src);
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}
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#[test]
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fn uninit_clone_from_slice() {
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let mut dst = [MaybeUninit::new(255); 64];
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let src = [0; 64];
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assert_eq!(MaybeUninit::write_slice_cloned(&mut dst, &src), &src);
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}
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#[test]
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#[should_panic(expected = "destination and source slices have different lengths")]
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fn uninit_write_slice_cloned_panic_lt() {
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let mut dst = [MaybeUninit::uninit(); 64];
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let src = [0; 32];
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MaybeUninit::write_slice_cloned(&mut dst, &src);
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}
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#[test]
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#[should_panic(expected = "destination and source slices have different lengths")]
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fn uninit_write_slice_cloned_panic_gt() {
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let mut dst = [MaybeUninit::uninit(); 64];
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let src = [0; 128];
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MaybeUninit::write_slice_cloned(&mut dst, &src);
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}
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#[test]
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#[cfg(panic = "unwind")]
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fn uninit_write_slice_cloned_mid_panic() {
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use std::panic;
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enum IncrementOrPanic {
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Increment(Rc<()>),
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ExpectedPanic,
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UnexpectedPanic,
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}
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impl Clone for IncrementOrPanic {
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fn clone(&self) -> Self {
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match self {
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Self::Increment(rc) => Self::Increment(rc.clone()),
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Self::ExpectedPanic => panic!("expected panic on clone"),
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Self::UnexpectedPanic => panic!("unexpected panic on clone"),
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}
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}
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}
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let rc = Rc::new(());
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let mut dst = [
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MaybeUninit::uninit(),
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MaybeUninit::uninit(),
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MaybeUninit::uninit(),
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MaybeUninit::uninit(),
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];
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let src = [
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IncrementOrPanic::Increment(rc.clone()),
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IncrementOrPanic::Increment(rc.clone()),
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IncrementOrPanic::ExpectedPanic,
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IncrementOrPanic::UnexpectedPanic,
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];
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let err = panic::catch_unwind(panic::AssertUnwindSafe(|| {
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MaybeUninit::write_slice_cloned(&mut dst, &src);
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}));
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drop(src);
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match err {
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Ok(_) => unreachable!(),
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Err(payload) => {
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payload
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.downcast::<&'static str>()
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.and_then(|s| if *s == "expected panic on clone" { Ok(s) } else { Err(s) })
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.unwrap_or_else(|p| panic::resume_unwind(p));
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assert_eq!(Rc::strong_count(&rc), 1)
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}
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}
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}
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#[test]
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fn uninit_write_slice_cloned_no_drop() {
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#[derive(Clone)]
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struct Bomb;
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impl Drop for Bomb {
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fn drop(&mut self) {
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panic!("dropped a bomb! kaboom")
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}
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}
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let mut dst = [MaybeUninit::uninit()];
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let src = [Bomb];
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MaybeUninit::write_slice_cloned(&mut dst, &src);
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forget(src);
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}
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#[test]
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fn uninit_const_assume_init_read() {
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const FOO: u32 = unsafe { MaybeUninit::new(42).assume_init_read() };
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assert_eq!(FOO, 42);
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}
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#[test]
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fn const_maybe_uninit() {
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use std::ptr;
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#[derive(Debug, PartialEq)]
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struct Foo {
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x: u8,
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y: u8,
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}
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const FIELD_BY_FIELD: Foo = unsafe {
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let mut val = MaybeUninit::uninit();
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init_y(&mut val); // order shouldn't matter
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init_x(&mut val);
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val.assume_init()
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};
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const fn init_x(foo: &mut MaybeUninit<Foo>) {
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unsafe {
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*ptr::addr_of_mut!((*foo.as_mut_ptr()).x) = 1;
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}
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}
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const fn init_y(foo: &mut MaybeUninit<Foo>) {
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unsafe {
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*ptr::addr_of_mut!((*foo.as_mut_ptr()).y) = 2;
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}
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}
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assert_eq!(FIELD_BY_FIELD, Foo { x: 1, y: 2 });
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}
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#[test]
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#[cfg(not(bootstrap))]
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fn offset_of() {
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#[repr(C)]
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struct Foo {
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x: u8,
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y: u16,
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z: Bar,
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}
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#[repr(C)]
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struct Bar(u8, u8);
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assert_eq!(offset_of!(Foo, x), 0);
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assert_eq!(offset_of!(Foo, y), 2);
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assert_eq!(offset_of!(Foo, z.0), 4);
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assert_eq!(offset_of!(Foo, z.1), 5);
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// Layout of tuples is unstable
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assert!(offset_of!((u8, u16), 0) <= size_of::<(u8, u16)>() - 1);
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assert!(offset_of!((u8, u16), 1) <= size_of::<(u8, u16)>() - 2);
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}
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#[test]
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#[cfg(not(bootstrap))]
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fn offset_of_union() {
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#[repr(C)]
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union Foo {
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x: u8,
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y: u16,
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z: Bar,
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}
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#[repr(C)]
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#[derive(Copy, Clone)]
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struct Bar(u8, u8);
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assert_eq!(offset_of!(Foo, x), 0);
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assert_eq!(offset_of!(Foo, y), 0);
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assert_eq!(offset_of!(Foo, z.0), 0);
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assert_eq!(offset_of!(Foo, z.1), 1);
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}
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#[test]
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#[cfg(not(bootstrap))]
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fn offset_of_dst() {
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#[repr(C)]
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struct Alpha {
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x: u8,
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y: u16,
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z: [u8],
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}
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trait Trait {}
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#[repr(C)]
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struct Beta {
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x: u8,
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y: u16,
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z: dyn Trait,
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}
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extern "C" {
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type Extern;
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}
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#[repr(C)]
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struct Gamma {
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x: u8,
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y: u16,
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z: Extern,
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}
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assert_eq!(offset_of!(Alpha, x), 0);
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assert_eq!(offset_of!(Alpha, y), 2);
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assert_eq!(offset_of!(Beta, x), 0);
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assert_eq!(offset_of!(Beta, y), 2);
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assert_eq!(offset_of!(Gamma, x), 0);
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assert_eq!(offset_of!(Gamma, y), 2);
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}
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#[test]
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#[cfg(not(bootstrap))]
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fn offset_of_packed() {
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#[repr(C, packed)]
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struct Foo {
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x: u8,
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y: u16,
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}
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assert_eq!(offset_of!(Foo, x), 0);
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assert_eq!(offset_of!(Foo, y), 1);
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}
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#[test]
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#[cfg(not(bootstrap))]
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fn offset_of_projection() {
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#[repr(C)]
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struct Foo {
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x: u8,
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y: u16,
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}
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trait Projector {
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type Type;
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}
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impl Projector for () {
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type Type = Foo;
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}
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assert_eq!(offset_of!(<() as Projector>::Type, x), 0);
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assert_eq!(offset_of!(<() as Projector>::Type, y), 2);
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}
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#[test]
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#[cfg(not(bootstrap))]
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fn offset_of_alias() {
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#[repr(C)]
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struct Foo {
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x: u8,
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y: u16,
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}
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type Bar = Foo;
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assert_eq!(offset_of!(Bar, x), 0);
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assert_eq!(offset_of!(Bar, y), 2);
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}
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#[test]
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#[cfg(not(bootstrap))]
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fn const_offset_of() {
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#[repr(C)]
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struct Foo {
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x: u8,
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y: u16,
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}
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const X_OFFSET: usize = offset_of!(Foo, x);
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const Y_OFFSET: usize = offset_of!(Foo, y);
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assert_eq!(X_OFFSET, 0);
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assert_eq!(Y_OFFSET, 2);
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}
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#[test]
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#[cfg(not(bootstrap))]
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fn offset_of_without_const_promotion() {
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#[repr(C)]
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struct Foo<SuppressConstPromotion> {
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x: u8,
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y: u16,
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_scp: SuppressConstPromotion,
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}
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// Normally, offset_of is always const promoted.
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// The generic parameter prevents this from happening.
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// This is needed to test the codegen impl of offset_of
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fn inner<SuppressConstPromotion>() {
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assert_eq!(offset_of!(Foo<SuppressConstPromotion>, x), 0);
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assert_eq!(offset_of!(Foo<SuppressConstPromotion>, y), 2);
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}
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inner::<()>();
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}
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#[test]
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#[cfg(not(bootstrap))]
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fn offset_of_addr() {
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#[repr(C)]
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struct Foo {
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x: u8,
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y: u16,
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z: Bar,
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}
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#[repr(C)]
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struct Bar(u8, u8);
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let base = Foo { x: 0, y: 0, z: Bar(0, 0) };
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assert_eq!(ptr::addr_of!(base).addr() + offset_of!(Foo, x), ptr::addr_of!(base.x).addr());
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assert_eq!(ptr::addr_of!(base).addr() + offset_of!(Foo, y), ptr::addr_of!(base.y).addr());
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assert_eq!(ptr::addr_of!(base).addr() + offset_of!(Foo, z.0), ptr::addr_of!(base.z.0).addr());
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assert_eq!(ptr::addr_of!(base).addr() + offset_of!(Foo, z.1), ptr::addr_of!(base.z.1).addr());
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}
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