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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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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_reject_intersecting.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_reject_intersecting.rs')
-rw-r--r-- | tests/ui/transmutability/unions/should_reject_intersecting.rs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/tests/ui/transmutability/unions/should_reject_intersecting.rs b/tests/ui/transmutability/unions/should_reject_intersecting.rs new file mode 100644 index 000000000..9cd4233ee --- /dev/null +++ b/tests/ui/transmutability/unions/should_reject_intersecting.rs @@ -0,0 +1,38 @@ +//! ALL valid bit patterns of the source must be valid bit patterns of the +//! destination type, unless validity is assumed. + +#![crate_type = "lib"] +#![feature(transmutability)] +#![allow(dead_code, incomplete_features, non_camel_case_types)] + +mod assert { + use std::mem::{Assume, BikeshedIntrinsicFrom}; + pub struct Context; + + pub fn is_transmutable<Src, Dst>() + where + Dst: BikeshedIntrinsicFrom<Src, Context, { Assume::SAFETY }> + // validity is NOT assumed --------------^^^^^^^^^^^^^^^^^^ + {} +} + +#[derive(Clone, Copy)] #[repr(u8)] enum Ox00 { V = 0x00 } +#[derive(Clone, Copy)] #[repr(u8)] enum Ox7F { V = 0x7F } +#[derive(Clone, Copy)] #[repr(u8)] enum OxFF { V = 0xFF } + +fn test() { + #[repr(C)] + union A { + a: Ox00, + b: Ox7F, + } + + #[repr(C)] + union B { + a: Ox7F, + b: OxFF, + } + + assert::is_transmutable::<A, B>(); //~ ERROR cannot be safely transmuted + assert::is_transmutable::<B, A>(); //~ ERROR cannot be safely transmuted +} |