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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/transmutability/enums/should_order_correctly.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/transmutability/enums/should_order_correctly.rs')
-rw-r--r-- | src/test/ui/transmutability/enums/should_order_correctly.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/ui/transmutability/enums/should_order_correctly.rs b/src/test/ui/transmutability/enums/should_order_correctly.rs new file mode 100644 index 000000000..6558d2658 --- /dev/null +++ b/src/test/ui/transmutability/enums/should_order_correctly.rs @@ -0,0 +1,32 @@ +// check-pass +//! The payloads of an enum variant should be ordered after its tag. + +#![crate_type = "lib"] +#![feature(arbitrary_enum_discriminant)] +#![feature(transmutability)] +#![allow(dead_code)] + +mod assert { + use std::mem::BikeshedIntrinsicFrom; + pub struct Context; + + pub fn is_transmutable<Src, Dst>() + where + Dst: BikeshedIntrinsicFrom<Src, Context, true, true, true, true> + {} +} + +#[repr(u8)] enum V0 { V = 0 } +#[repr(u8)] enum V1 { V = 1 } +#[repr(u8)] enum V2 { V = 2 } + +#[repr(u8)] enum E01 { V0(V1) = 0u8 } +#[repr(u8)] enum E012 { V0(V1, V2) = 0u8 } + +fn should_order_tag_and_fields_correctly() { + // An implementation that (incorrectly) arranges E01 as [0x01, 0x00] will, + // in principle, reject this transmutation. + assert::is_transmutable::<E01, V0>(); + // Again, but with one more field. + assert::is_transmutable::<E012, E01>(); +} |