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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/consts/const_discriminant.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/consts/const_discriminant.rs')
-rw-r--r-- | src/test/ui/consts/const_discriminant.rs | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/test/ui/consts/const_discriminant.rs b/src/test/ui/consts/const_discriminant.rs new file mode 100644 index 000000000..f623c5101 --- /dev/null +++ b/src/test/ui/consts/const_discriminant.rs @@ -0,0 +1,43 @@ +// run-pass +#![feature(const_discriminant)] +#![feature(bench_black_box)] +#![allow(dead_code)] + +use std::mem::{discriminant, Discriminant}; +use std::hint::black_box; + +enum Test { + A(u8), + B, + C { a: u8, b: u8 }, +} + +const TEST_A: Discriminant<Test> = discriminant(&Test::A(5)); +const TEST_A_OTHER: Discriminant<Test> = discriminant(&Test::A(17)); +const TEST_B: Discriminant<Test> = discriminant(&Test::B); + +enum Void {} + +enum SingleVariant { + V, + Never(Void), +} + +const TEST_V: Discriminant<SingleVariant> = discriminant(&SingleVariant::V); + +pub const TEST_VOID: () = { + // This is UB, but CTFE does not check validity so it does not detect this. + // This is a regression test for https://github.com/rust-lang/rust/issues/89765. + unsafe { std::mem::discriminant(&*(&() as *const () as *const Void)); }; +}; + + +fn main() { + assert_eq!(TEST_A, TEST_A_OTHER); + assert_eq!(TEST_A, discriminant(black_box(&Test::A(17)))); + assert_eq!(TEST_B, discriminant(black_box(&Test::B))); + assert_ne!(TEST_A, TEST_B); + assert_ne!(TEST_B, discriminant(black_box(&Test::C { a: 42, b: 7 }))); + + assert_eq!(TEST_V, discriminant(black_box(&SingleVariant::V))); +} |