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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:50 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:50 +0000 |
commit | 2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35 (patch) | |
tree | d325add32978dbdc1db975a438b3a77d571b1ab8 /tests/ui/derives/deriving-with-repr-packed-2.rs | |
parent | Releasing progress-linux version 1.68.2+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35.tar.xz rustc-2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35.zip |
Merging upstream version 1.69.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/derives/deriving-with-repr-packed-2.rs')
-rw-r--r-- | tests/ui/derives/deriving-with-repr-packed-2.rs | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/derives/deriving-with-repr-packed-2.rs b/tests/ui/derives/deriving-with-repr-packed-2.rs new file mode 100644 index 000000000..79aca74df --- /dev/null +++ b/tests/ui/derives/deriving-with-repr-packed-2.rs @@ -0,0 +1,20 @@ +// Check that deriving certain builtin traits on certain packed structs cause +// errors. To avoid potentially misaligned references, field copies must be +// used, which involves adding `T: Copy` bounds. + +#[derive(Copy, Clone, Default, PartialEq, Eq)] +#[repr(packed)] +pub struct Foo<T>(T, T, T); + +struct NonCopy; + +fn main() { + // This one is fine because `u32` impls `Copy`. + let x: Foo<u32> = Foo(1, 2, 3); + _ = x.clone(); + + // This one is an error because `NonCopy` doesn't impl `Copy`. + let x: Foo<NonCopy> = Foo(NonCopy, NonCopy, NonCopy); + _ = x.clone(); + //~^ ERROR the method `clone` exists for struct `Foo<NonCopy>`, but its trait bounds were not satisfied +} |