From 218caa410aa38c29984be31a5229b9fa717560ee Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:19:13 +0200 Subject: Merging upstream version 1.68.2+dfsg1. Signed-off-by: Daniel Baumann --- tests/ui/consts/const_discriminant.rs | 42 +++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 tests/ui/consts/const_discriminant.rs (limited to 'tests/ui/consts/const_discriminant.rs') diff --git a/tests/ui/consts/const_discriminant.rs b/tests/ui/consts/const_discriminant.rs new file mode 100644 index 000000000..79e68590e --- /dev/null +++ b/tests/ui/consts/const_discriminant.rs @@ -0,0 +1,42 @@ +// run-pass +#![feature(const_discriminant)] +#![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 = discriminant(&Test::A(5)); +const TEST_A_OTHER: Discriminant = discriminant(&Test::A(17)); +const TEST_B: Discriminant = discriminant(&Test::B); + +enum Void {} + +enum SingleVariant { + V, + Never(Void), +} + +const TEST_V: Discriminant = 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))); +} -- cgit v1.2.3