diff options
Diffstat (limited to '')
5 files changed, 95 insertions, 0 deletions
diff --git a/tests/ui/coherence/coherence-doesnt-use-infcx-evaluate.rs b/tests/ui/coherence/coherence-doesnt-use-infcx-evaluate.rs new file mode 100644 index 000000000..063826f1d --- /dev/null +++ b/tests/ui/coherence/coherence-doesnt-use-infcx-evaluate.rs @@ -0,0 +1,24 @@ +// check-pass +// issue: 113415 + +// Makes sure that coherence doesn't call any of the `predicate_may_hold`-esque fns, +// since they are using a different infcx which doesn't preserve the intercrate flag. + +#![feature(specialization)] +//~^ WARN the feature `specialization` is incomplete + +trait Assoc { + type Output; +} + +default impl<T> Assoc for T { + type Output = bool; +} + +impl Assoc for u8 {} + +trait Foo {} +impl Foo for u32 {} +impl Foo for <u8 as Assoc>::Output {} + +fn main() {} diff --git a/tests/ui/coherence/coherence-doesnt-use-infcx-evaluate.stderr b/tests/ui/coherence/coherence-doesnt-use-infcx-evaluate.stderr new file mode 100644 index 000000000..56eb21cd2 --- /dev/null +++ b/tests/ui/coherence/coherence-doesnt-use-infcx-evaluate.stderr @@ -0,0 +1,12 @@ +warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes + --> $DIR/coherence-doesnt-use-infcx-evaluate.rs:7:12 + | +LL | #![feature(specialization)] + | ^^^^^^^^^^^^^^ + | + = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information + = help: consider using `min_specialization` instead, which is more stable and complete + = note: `#[warn(incomplete_features)]` on by default + +warning: 1 warning emitted + diff --git a/tests/ui/coherence/coherence-inherited-assoc-ty-cycle-err.stderr b/tests/ui/coherence/coherence-inherited-assoc-ty-cycle-err.stderr index 7bd50649d..684e52822 100644 --- a/tests/ui/coherence/coherence-inherited-assoc-ty-cycle-err.stderr +++ b/tests/ui/coherence/coherence-inherited-assoc-ty-cycle-err.stderr @@ -20,6 +20,7 @@ note: cycle used when coherence checking all impls of trait `Trait` | LL | trait Trait<T> { type Assoc; } | ^^^^^^^^^^^^^^ + = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information error: aborting due to previous error; 1 warning emitted 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() {} diff --git a/tests/ui/coherence/warn-when-cycle-is-error-in-coherence.stderr b/tests/ui/coherence/warn-when-cycle-is-error-in-coherence.stderr new file mode 100644 index 000000000..f315ba821 --- /dev/null +++ b/tests/ui/coherence/warn-when-cycle-is-error-in-coherence.stderr @@ -0,0 +1,23 @@ +error: implementations of `PartialEq<Interval<_>>` for `Interval<_>` will conflict in the future + --> $DIR/warn-when-cycle-is-error-in-coherence.rs:13:1 + | +LL | #[derive(PartialEq, Default)] + | --------- the second impl is here +... +LL | impl<T, Q> PartialEq<Q> for Interval<T> + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the first impl is here +... +LL | Q: ?Sized + PartialOrd, + | ---------- `Interval<_>: PartialOrd` may be considered to hold in future releases, causing the impls to overlap + | + = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! + = note: for more information, see issue #114040 <https://github.com/rust-lang/rust/issues/114040> + = note: impls that are not considered to overlap may be considered to overlap in the future +note: the lint level is defined here + --> $DIR/warn-when-cycle-is-error-in-coherence.rs:1:9 + | +LL | #![deny(coinductive_overlap_in_coherence)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: aborting due to previous error + |