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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/derives/deriving-with-repr-packed.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/derives/deriving-with-repr-packed.rs')
-rw-r--r-- | tests/ui/derives/deriving-with-repr-packed.rs | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/tests/ui/derives/deriving-with-repr-packed.rs b/tests/ui/derives/deriving-with-repr-packed.rs new file mode 100644 index 000000000..3884e3977 --- /dev/null +++ b/tests/ui/derives/deriving-with-repr-packed.rs @@ -0,0 +1,45 @@ +#![deny(unaligned_references)] + +// Check that deriving certain builtin traits on certain packed structs cause +// errors. This happens when the derived trait would need to use a potentially +// misaligned reference. But there are two cases that are allowed: +// - If all the fields within the struct meet the required alignment: 1 for +// `repr(packed)`, or `N` for `repr(packed(N))`. +// - If `Default` is the only trait derived, because it doesn't involve any +// references. + +#[derive(Copy, Clone, Default, PartialEq, Eq)] +//~^ ERROR `Clone` can't be derived on this `#[repr(packed)]` struct with type or const parameters +//~| hard error +//~^^^ ERROR `PartialEq` can't be derived on this `#[repr(packed)]` struct with type or const parameters +//~| hard error +#[repr(packed)] +pub struct Foo<T>(T, T, T); + +#[derive(Default, Hash)] +//~^ ERROR `Hash` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy` +//~| hard error +#[repr(packed)] +pub struct Bar(u32, u32, u32); + +// This one is fine because the field alignment is 1. +#[derive(Default, Hash)] +#[repr(packed)] +pub struct Bar2(u8, i8, bool); + +// This one is fine because the field alignment is 2, matching `packed(2)`. +#[derive(Default, Hash)] +#[repr(packed(2))] +pub struct Bar3(u16, i16, bool); + +// This one is fine because it's not packed. +#[derive(Debug, Default)] +struct Y(usize); + +#[derive(Debug, Default)] +//~^ ERROR `Debug` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy` +//~| hard error +#[repr(packed)] +struct X(Y); + +fn main() {} |