32 lines
1.1 KiB
Rust
32 lines
1.1 KiB
Rust
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// run-pass
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// This does not reflect a stable guarantee (we guarantee very little for equality of pointers
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// around `const`), but it would be good to understand what is happening if these assertions ever
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// fail.
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use std::ptr::NonNull;
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use std::slice::from_raw_parts;
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const PTR_U8: *const u8 = NonNull::dangling().as_ptr();
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const CONST_U8_REF: &[u8] = unsafe { from_raw_parts(PTR_U8, 0) };
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const CONST_U8_PTR: *const u8 = unsafe { from_raw_parts(PTR_U8, 0).as_ptr() };
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static STATIC_U8_REF: &[u8] = unsafe { from_raw_parts(PTR_U8, 0) };
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const PTR_U16: *const u16 = NonNull::dangling().as_ptr();
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const CONST_U16_REF: &[u16] = unsafe { from_raw_parts(PTR_U16, 0) };
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const fn const_u8_fn() -> &'static [u8] {
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unsafe { from_raw_parts(PTR_U8, 0) }
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}
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fn main() {
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let ptr_u8 = unsafe { from_raw_parts(PTR_U8, 0) }.as_ptr();
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let ptr_u16 = unsafe { from_raw_parts(PTR_U16, 0) }.as_ptr();
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assert_eq!(ptr_u8, PTR_U8);
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assert_eq!(ptr_u8, CONST_U8_PTR);
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assert_eq!(ptr_u8, const_u8_fn().as_ptr());
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assert_eq!(ptr_u8, STATIC_U8_REF.as_ptr());
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assert_eq!(ptr_u16, CONST_U16_REF.as_ptr());
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assert_eq!(ptr_u8, CONST_U8_REF.as_ptr());
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}
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