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// { dg-additional-options "-w" }
#![feature(intrinsics)]
#[lang = "sized"]
pub trait Sized {}
extern "rust-intrinsic" {
#[rustc_const_stable(feature = "const_ptr_offset", since = "1.61.0")]
pub fn offset<T>(dst: *const T, offset: isize) -> *const T;
}
struct FatPtr<T> {
data: *const T,
len: usize,
}
union Repr<T> {
rust: *const [T],
rust_mut: *mut [T],
raw: FatPtr<T>,
}
impl<T> *const [T] {
pub const fn len(self) -> usize {
// SAFETY: this is safe because `*const [T]` and `FatPtr<T>` have the same layout.
// Only `std` can make this guarantee.
unsafe { Repr { rust: self }.raw.len }
}
pub const fn as_ptr(self) -> *const T {
self as *const T
}
}
impl<T> *const T {
pub const unsafe fn offset(self, count: isize) -> *const T {
unsafe { offset(self, count) }
}
pub const unsafe fn add(self, count: usize) -> Self {
unsafe { self.offset(count as isize) }
}
pub const fn as_ptr(self) -> *const T {
self as *const T
}
}
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