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