38 lines
1.3 KiB
Rust
38 lines
1.3 KiB
Rust
#![feature(rustc_attrs, const_transmute)]
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#![allow(const_err)] // make sure we cannot allow away the errors tested here
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use std::mem;
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use std::ptr::NonNull;
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use std::num::{NonZeroU8, NonZeroUsize};
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const NULL_PTR: NonNull<u8> = unsafe { mem::transmute(0usize) };
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//~^ ERROR it is undefined behavior to use this value
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const NULL_U8: NonZeroU8 = unsafe { mem::transmute(0u8) };
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//~^ ERROR it is undefined behavior to use this value
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const NULL_USIZE: NonZeroUsize = unsafe { mem::transmute(0usize) };
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//~^ ERROR it is undefined behavior to use this value
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union Transmute {
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uninit: (),
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out: NonZeroU8,
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}
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const UNINIT: NonZeroU8 = unsafe { Transmute { uninit: () }.out };
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//~^ ERROR it is undefined behavior to use this value
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// Also test other uses of rustc_layout_scalar_valid_range_start
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#[rustc_layout_scalar_valid_range_start(10)]
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#[rustc_layout_scalar_valid_range_end(30)]
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struct RestrictedRange1(u32);
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const BAD_RANGE1: RestrictedRange1 = unsafe { RestrictedRange1(42) };
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//~^ ERROR it is undefined behavior to use this value
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#[rustc_layout_scalar_valid_range_start(30)]
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#[rustc_layout_scalar_valid_range_end(10)]
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struct RestrictedRange2(u32);
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const BAD_RANGE2: RestrictedRange2 = unsafe { RestrictedRange2(20) };
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//~^ ERROR it is undefined behavior to use this value
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fn main() {}
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