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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/unsafe/union-assignop.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/unsafe/union-assignop.rs')
-rw-r--r-- | tests/ui/unsafe/union-assignop.rs | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/tests/ui/unsafe/union-assignop.rs b/tests/ui/unsafe/union-assignop.rs new file mode 100644 index 000000000..5e667cd10 --- /dev/null +++ b/tests/ui/unsafe/union-assignop.rs @@ -0,0 +1,29 @@ +// revisions: mirunsafeck thirunsafeck +// [thirunsafeck]compile-flags: -Z thir-unsafeck + +use std::ops::AddAssign; +use std::mem::ManuallyDrop; + +struct NonCopy; +impl AddAssign for NonCopy { + fn add_assign(&mut self, _: Self) {} +} + +union Foo { + a: u8, // non-dropping + b: ManuallyDrop<NonCopy>, +} + +fn main() { + let mut foo = Foo { a: 42 }; + foo.a += 5; //~ ERROR access to union field is unsafe + *foo.b += NonCopy; //~ ERROR access to union field is unsafe + *foo.b = NonCopy; //~ ERROR access to union field is unsafe + foo.b = ManuallyDrop::new(NonCopy); + foo.a; //~ ERROR access to union field is unsafe + let foo = Foo { a: 42 }; + foo.b; //~ ERROR access to union field is unsafe + let mut foo = Foo { a: 42 }; + foo.b = foo.b; + //~^ ERROR access to union field is unsafe +} |