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// Strip out raw byte dumps to make comparison platform-independent:
//@ normalize-stderr: "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
//@ normalize-stderr: "([0-9a-f][0-9a-f] |__ |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
//@ normalize-stderr: "0x0+" -> "0x0"
//@ normalize-stderr: "0x[0-9](\.\.|\])" -> "0x%$1"
//@ dont-require-annotations: NOTE
#![feature(never_type)]
#![allow(invalid_value, unnecessary_transmutes)]
use std::mem;
#[repr(transparent)]
#[derive(Copy, Clone)]
struct Wrap<T>(T);
#[derive(Copy, Clone)]
enum Never {}
// # simple enum with discriminant 0
#[repr(usize)]
#[derive(Copy, Clone)]
enum Enum {
A = 0,
}
const GOOD_ENUM: Enum = unsafe { mem::transmute(0usize) };
const BAD_ENUM: Enum = unsafe { mem::transmute(1usize) };
//~^ ERROR expected a valid enum tag
const BAD_ENUM_PTR: Enum = unsafe { mem::transmute(&1) };
//~^ ERROR unable to turn pointer into integer
const BAD_ENUM_WRAPPED: Wrap<Enum> = unsafe { mem::transmute(&1) };
//~^ ERROR unable to turn pointer into integer
// # simple enum with discriminant 2
// (Potentially) invalid enum discriminant
#[repr(usize)]
#[derive(Copy, Clone)]
enum Enum2 {
A = 2,
}
const BAD_ENUM2: Enum2 = unsafe { mem::transmute(0usize) };
//~^ ERROR expected a valid enum tag
const BAD_ENUM2_PTR: Enum2 = unsafe { mem::transmute(&0) };
//~^ ERROR unable to turn pointer into integer
// something wrapping the enum so that we test layout first, not enum
const BAD_ENUM2_WRAPPED: Wrap<Enum2> = unsafe { mem::transmute(&0) };
//~^ ERROR unable to turn pointer into integer
// Undef enum discriminant.
#[repr(C)]
union MaybeUninit<T: Copy> {
uninit: (),
init: T,
}
const BAD_ENUM2_UNDEF: Enum2 = unsafe { MaybeUninit { uninit: () }.init };
//~^ ERROR uninitialized
// Pointer value in an enum with a niche that is not just 0.
const BAD_ENUM2_OPTION_PTR: Option<Enum2> = unsafe { mem::transmute(&0) };
//~^ ERROR unable to turn pointer into integer
// # valid discriminant for uninhabited variant
// An enum with uninhabited variants but also at least 2 inhabited variants -- so the uninhabited
// variants *do* have a discriminant.
enum UninhDiscriminant {
A,
B(!),
C,
D(Never),
}
const GOOD_INHABITED_VARIANT1: UninhDiscriminant = unsafe { mem::transmute(0u8) }; // variant A
const GOOD_INHABITED_VARIANT2: UninhDiscriminant = unsafe { mem::transmute(2u8) }; // variant C
const BAD_UNINHABITED_VARIANT1: UninhDiscriminant = unsafe { mem::transmute(1u8) };
//~^ ERROR uninhabited enum variant
const BAD_UNINHABITED_VARIANT2: UninhDiscriminant = unsafe { mem::transmute(3u8) };
//~^ ERROR uninhabited enum variant
// # other
// Invalid enum field content (mostly to test printing of paths for enum tuple
// variants and tuples).
// Need to create something which does not clash with enum layout optimizations.
const BAD_OPTION_CHAR: Option<(char, char)> = Some(('x', unsafe { mem::transmute(!0u32) }));
//~^ ERROR expected a valid unicode scalar
// All variants are uninhabited but also have data.
// Use `0` as constant to make behavior endianness-independent.
const BAD_UNINHABITED_WITH_DATA1: Result<(i32, Never), (i32, !)> = unsafe { mem::transmute(0u64) };
//~^ ERROR uninhabited enum variant
const BAD_UNINHABITED_WITH_DATA2: Result<(i32, !), (i32, Never)> = unsafe { mem::transmute(0u64) };
//~^ ERROR uninhabited enum variant
const TEST_ICE_89765: () = {
// This is a regression test for https://github.com/rust-lang/rust/issues/89765.
unsafe {
std::mem::discriminant(&*(&() as *const () as *const Never));
//~^ ERROR uninhabited enum variant
};
};
fn main() {}
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