diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/transmutability/unions/should_pad_variants.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/transmutability/unions/should_pad_variants.rs')
-rw-r--r-- | tests/ui/transmutability/unions/should_pad_variants.rs | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/tests/ui/transmutability/unions/should_pad_variants.rs b/tests/ui/transmutability/unions/should_pad_variants.rs new file mode 100644 index 000000000..cabe54467 --- /dev/null +++ b/tests/ui/transmutability/unions/should_pad_variants.rs @@ -0,0 +1,45 @@ +//! The variants of a union must be padded with uninit bytes such that they have +//! the same length (in bytes). + +#![crate_type = "lib"] +#![feature(transmutability)] +#![allow(dead_code)] + +mod assert { + use std::mem::{Assume, BikeshedIntrinsicFrom}; + + pub fn is_transmutable<Src, Dst, Context>() + where + Dst: BikeshedIntrinsicFrom<Src, Context, { + Assume::ALIGNMENT + .and(Assume::LIFETIMES) + .and(Assume::SAFETY) + .and(Assume::VALIDITY) + }> + {} +} + +#[derive(Clone, Copy)] +#[repr(C)] struct Zst; + +#[derive(Clone, Copy)] +#[repr(u8)] enum V0 { V = 0 } + +#[derive(Clone, Copy)] +#[repr(u8)] enum V2 { V = 2 } + +#[repr(C)] +union Lopsided { + smol: Zst, + lorg: V0, +} + +#[repr(C)] struct Src(V0, Zst, V2); +#[repr(C)] struct Dst(V0, Lopsided, V2); + +fn should_pad_variants() { + struct Context; + // If the implementation (incorrectly) fails to pad `Lopsided::smol` with + // an uninitialized byte, this transmutation might be (wrongly) accepted: + assert::is_transmutable::<Src, Dst, Context>(); //~ ERROR cannot be safely transmuted +} |