rust/tests/ui/consts/const-eval/ub-uninhabit.rs

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// Strip out raw byte dumps to make comparison platform-independent:
//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
#![feature(core_intrinsics)]
#![feature(never_type)]
use std::intrinsics;
use std::mem;
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#[derive(Copy, Clone)]
enum Bar {}
#[repr(C)]
union MaybeUninit<T: Copy> {
uninit: (),
init: T,
}
const BAD_BAD_BAD: Bar = unsafe { MaybeUninit { uninit: () }.init };
//~^ ERROR evaluation of constant value failed
//~| constructing invalid value
const BAD_BAD_REF: &Bar = unsafe { mem::transmute(1usize) };
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//~^ ERROR it is undefined behavior to use this value
//~| constructing invalid value
const BAD_BAD_ARRAY: [Bar; 1] = unsafe { MaybeUninit { uninit: () }.init };
//~^ ERROR evaluation of constant value failed
//~| constructing invalid value
const READ_NEVER: () = unsafe {
let mem = [0u32; 8];
let ptr = mem.as_ptr().cast::<!>();
let _val = intrinsics::read_via_copy(ptr);
//~^ ERROR evaluation of constant value failed
//~| constructing invalid value
};
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fn main() {}