mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-02 07:22:42 +00:00
109 lines
3.5 KiB
Rust
109 lines
3.5 KiB
Rust
// 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"
|
|
//@ normalize-stderr-test "0x0+" -> "0x0"
|
|
#![feature(never_type)]
|
|
#![allow(invalid_value)]
|
|
|
|
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 is undefined behavior
|
|
|
|
const BAD_ENUM_PTR: Enum = unsafe { mem::transmute(&1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
const BAD_ENUM_WRAPPED: Wrap<Enum> = unsafe { mem::transmute(&1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
// # 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 is undefined behavior
|
|
const BAD_ENUM2_PTR: Enum2 = unsafe { mem::transmute(&0) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
// something wrapping the enum so that we test layout first, not enum
|
|
const BAD_ENUM2_WRAPPED: Wrap<Enum2> = unsafe { mem::transmute(&0) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
// Undef enum discriminant.
|
|
#[repr(C)]
|
|
union MaybeUninit<T: Copy> {
|
|
uninit: (),
|
|
init: T,
|
|
}
|
|
const BAD_ENUM2_UNDEF : Enum2 = unsafe { MaybeUninit { uninit: () }.init };
|
|
//~^ ERROR evaluation of constant value failed
|
|
//~| 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 evaluation of constant value failed
|
|
|
|
// # 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 is undefined behavior
|
|
const BAD_UNINHABITED_VARIANT2: UninhDiscriminant = unsafe { mem::transmute(3u8) };
|
|
//~^ ERROR is undefined behavior
|
|
|
|
// # 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 is undefined behavior
|
|
|
|
// 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 evaluation of constant value failed
|
|
const BAD_UNINHABITED_WITH_DATA2: Result<(i32, !), (i32, Never)> = unsafe { mem::transmute(0u64) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
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)); };
|
|
//~^ inside `TEST_ICE_89765`
|
|
};
|
|
|
|
fn main() {
|
|
}
|