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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/structs-enums/enum-univariant-repr.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/structs-enums/enum-univariant-repr.rs')
-rw-r--r-- | src/test/ui/structs-enums/enum-univariant-repr.rs | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/src/test/ui/structs-enums/enum-univariant-repr.rs b/src/test/ui/structs-enums/enum-univariant-repr.rs new file mode 100644 index 000000000..1e0f67887 --- /dev/null +++ b/src/test/ui/structs-enums/enum-univariant-repr.rs @@ -0,0 +1,51 @@ +// run-pass + +use std::mem; + +// Univariant C-like enum +#[repr(i32)] +enum Univariant { + X = 17 +} + +#[repr(u16)] +enum UnivariantWithoutDescr { + Y +} + +#[repr(u8)] +enum UnivariantWithData { + Z(u8), +} + +pub fn main() { + { + assert_eq!(4, mem::size_of::<Univariant>()); + assert_eq!(17, Univariant::X as i32); + + let enums: &[Univariant] = + &[Univariant::X, Univariant::X, Univariant::X]; + let ints: &[i32] = unsafe { mem::transmute(enums) }; + // check it has the same memory layout as i32 + assert_eq!(&[17, 17, 17], ints); + } + + { + assert_eq!(2, mem::size_of::<UnivariantWithoutDescr>()); + let descr = UnivariantWithoutDescr::Y as u16; + + let enums: &[UnivariantWithoutDescr] = + &[UnivariantWithoutDescr::Y, UnivariantWithoutDescr::Y, UnivariantWithoutDescr::Y]; + let ints: &[u16] = unsafe { mem::transmute(enums) }; + // check it has the same memory layout as u16 + assert_eq!(&[descr, descr, descr], ints); + } + + { + assert_eq!(2, mem::size_of::<UnivariantWithData>()); + + match UnivariantWithData::Z(4) { + UnivariantWithData::Z(x) => assert_eq!(x, 4), + } + } +} |