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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 /src/test/ui/auto-traits/typeck-auto-trait-no-supertraits.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 'src/test/ui/auto-traits/typeck-auto-trait-no-supertraits.rs')
-rw-r--r-- | src/test/ui/auto-traits/typeck-auto-trait-no-supertraits.rs | 39 |
1 files changed, 0 insertions, 39 deletions
diff --git a/src/test/ui/auto-traits/typeck-auto-trait-no-supertraits.rs b/src/test/ui/auto-traits/typeck-auto-trait-no-supertraits.rs deleted file mode 100644 index 2a76893fe..000000000 --- a/src/test/ui/auto-traits/typeck-auto-trait-no-supertraits.rs +++ /dev/null @@ -1,39 +0,0 @@ -// This test is for #29859, we need to ensure auto traits, -// (also known previously as default traits), do not have -// supertraits. Since the compiler synthesizes these -// instances on demand, we are essentially enabling -// users to write axioms if we view trait selection, -// as a proof system. -// -// For example the below test allows us to add the rule: -// forall (T : Type), T : Copy -// -// Providing a copy instance for *any* type, which -// is most definitely unsound. Imagine copying a -// type that contains a mutable reference, enabling -// mutable aliasing. -// -// You can imagine an even more dangerous test, -// which currently compiles on nightly. -// -// fn main() { -// let mut i = 10; -// let (a, b) = copy(&mut i); -// println!("{:?} {:?}", a, b); -// } - -#![feature(auto_traits)] -#![feature(negative_impls)] - -auto trait Magic: Copy {} //~ ERROR E0568 -impl<T:Magic> Magic for T {} - -fn copy<T: Magic>(x: T) -> (T, T) { (x, x) } - -#[derive(Debug)] -struct NoClone; - -fn main() { - let (a, b) = copy(NoClone); - println!("{:?} {:?}", a, b); -} |