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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-30 03:59:35 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-30 03:59:35 +0000 |
commit | d1b2d29528b7794b41e66fc2136e395a02f8529b (patch) | |
tree | a4a17504b260206dec3cf55b2dca82929a348ac2 /tests/ui/coherence/warn-when-cycle-is-error-in-coherence.rs | |
parent | Releasing progress-linux version 1.72.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-d1b2d29528b7794b41e66fc2136e395a02f8529b.tar.xz rustc-d1b2d29528b7794b41e66fc2136e395a02f8529b.zip |
Merging upstream version 1.73.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/coherence/warn-when-cycle-is-error-in-coherence.rs')
-rw-r--r-- | tests/ui/coherence/warn-when-cycle-is-error-in-coherence.rs | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/tests/ui/coherence/warn-when-cycle-is-error-in-coherence.rs b/tests/ui/coherence/warn-when-cycle-is-error-in-coherence.rs new file mode 100644 index 000000000..01f7d6ce9 --- /dev/null +++ b/tests/ui/coherence/warn-when-cycle-is-error-in-coherence.rs @@ -0,0 +1,35 @@ +#![deny(coinductive_overlap_in_coherence)] + +use std::borrow::Borrow; +use std::cmp::Ordering; +use std::marker::PhantomData; + +#[derive(PartialEq, Default)] +pub(crate) struct Interval<T>(PhantomData<T>); + +// This impl overlaps with the `derive` unless we reject the nested +// `Interval<?1>: PartialOrd<Interval<?1>>` candidate which results +// in a - currently inductive - cycle. +impl<T, Q> PartialEq<Q> for Interval<T> +//~^ ERROR implementations of `PartialEq<Interval<_>>` for `Interval<_>` will conflict in the future +//~| WARN this was previously accepted by the compiler but is being phased out +where + T: Borrow<Q>, + Q: ?Sized + PartialOrd, +{ + fn eq(&self, _: &Q) -> bool { + true + } +} + +impl<T, Q> PartialOrd<Q> for Interval<T> +where + T: Borrow<Q>, + Q: ?Sized + PartialOrd, +{ + fn partial_cmp(&self, _: &Q) -> Option<Ordering> { + None + } +} + +fn main() {} |