Add regression tests
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Oli Scherer
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56c135c925
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526090b901
5 changed files with 136 additions and 22 deletions
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//@ known-bug: rust-lang/rust#124891
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type Tait = impl FnOnce() -> ();
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fn reify_as_tait() -> Thunk<Tait> {
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Thunk::new(|cont| cont)
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}
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struct Thunk<F>(F);
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impl<F> Thunk<F> {
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fn new(f: F)
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where
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F: ContFn,
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{
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todo!();
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}
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}
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trait ContFn {}
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impl<F: FnOnce(Tait) -> ()> ContFn for F {}
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59
tests/ui/impl-trait/lazy_subtyping_of_opaques.rs
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59
tests/ui/impl-trait/lazy_subtyping_of_opaques.rs
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//! This test checks that we allow subtyping predicates that contain opaque types.
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//! No hidden types are being constrained in the subtyping predicate, but type and
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//! lifetime variables get subtyped in the generic parameter list of the opaque.
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use std::iter;
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mod either {
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pub enum Either<L, R> {
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Left(L),
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Right(R),
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}
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impl<L: Iterator, R: Iterator<Item = L::Item>> Iterator for Either<L, R> {
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type Item = L::Item;
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fn next(&mut self) -> Option<Self::Item> {
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todo!()
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}
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}
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pub use self::Either::{Left, Right};
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}
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pub enum BabeConsensusLogRef<'a> {
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NextEpochData(BabeNextEpochRef<'a>),
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NextConfigData,
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}
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impl<'a> BabeConsensusLogRef<'a> {
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pub fn scale_encoding(
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&self,
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) -> impl Iterator<Item = impl AsRef<[u8]> + Clone + 'a> + Clone + 'a {
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//~^ ERROR is not satisfied
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//~| ERROR is not satisfied
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//~| ERROR is not satisfied
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match self {
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BabeConsensusLogRef::NextEpochData(digest) => either::Left(either::Left(
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digest.scale_encoding().map(either::Left).map(either::Left),
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)),
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BabeConsensusLogRef::NextConfigData => either::Right(
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// The Opaque type from ``scale_encoding` gets used opaquely here, while the `R`
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// generic parameter of `Either` contains type variables that get subtyped and the
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// opaque type contains lifetime variables that get subtyped.
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iter::once(either::Right(either::Left([1])))
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.chain(std::iter::once([1]).map(either::Right).map(either::Right)),
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),
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}
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}
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}
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pub struct BabeNextEpochRef<'a>(&'a ());
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impl<'a> BabeNextEpochRef<'a> {
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pub fn scale_encoding(
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&self,
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) -> impl Iterator<Item = impl AsRef<[u8]> + Clone + 'a> + Clone + 'a {
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std::iter::once([1])
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}
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}
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fn main() {}
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21
tests/ui/impl-trait/lazy_subtyping_of_opaques.stderr
Normal file
21
tests/ui/impl-trait/lazy_subtyping_of_opaques.stderr
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error[E0277]: the trait bound `Either<Either<Map<Map<impl Iterator<Item = impl AsRef<[u8]> + Clone + '_> + Clone + '_, fn(impl AsRef<[u8]> + Clone + '_) -> Either<impl AsRef<[u8]> + Clone + '_, _> {Either::<impl AsRef<[u8]> + Clone + '_, _>::Left}>, fn(Either<impl AsRef<[u8]> + Clone + '_, _>) -> Either<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>> {Either::<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>>::Left}>, _>, std::iter::Chain<std::iter::Once<Either<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>>>, Map<Map<std::iter::Once<[{integer}; 1]>, fn([{integer}; 1]) -> Either<[{integer}; 1], [{integer}; 1]> {Either::<[{integer}; 1], [{integer}; 1]>::Right}>, fn(Either<[{integer}; 1], [{integer}; 1]>) -> Either<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>> {Either::<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>>::Right}>>>: Clone` is not satisfied
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--> $DIR/lazy_subtyping_of_opaques.rs:30:10
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LL | ) -> impl Iterator<Item = impl AsRef<[u8]> + Clone + 'a> + Clone + 'a {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `Either<Either<Map<Map<impl Iterator<Item = impl AsRef<[u8]> + Clone + '_> + Clone + '_, fn(impl AsRef<[u8]> + Clone + '_) -> Either<impl AsRef<[u8]> + Clone + '_, _> {Either::<impl AsRef<[u8]> + Clone + '_, _>::Left}>, fn(Either<impl AsRef<[u8]> + Clone + '_, _>) -> Either<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>> {Either::<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>>::Left}>, _>, std::iter::Chain<std::iter::Once<Either<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>>>, Map<Map<std::iter::Once<[{integer}; 1]>, fn([{integer}; 1]) -> Either<[{integer}; 1], [{integer}; 1]> {Either::<[{integer}; 1], [{integer}; 1]>::Right}>, fn(Either<[{integer}; 1], [{integer}; 1]>) -> Either<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>> {Either::<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>>::Right}>>>`
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error[E0277]: the trait bound `Either<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>>: AsRef<[u8]>` is not satisfied
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--> $DIR/lazy_subtyping_of_opaques.rs:30:31
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LL | ) -> impl Iterator<Item = impl AsRef<[u8]> + Clone + 'a> + Clone + 'a {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `AsRef<[u8]>` is not implemented for `Either<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>>`
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error[E0277]: the trait bound `Either<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>>: Clone` is not satisfied
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--> $DIR/lazy_subtyping_of_opaques.rs:30:31
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LL | ) -> impl Iterator<Item = impl AsRef<[u8]> + Clone + 'a> + Clone + 'a {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `Either<Either<impl AsRef<[u8]> + Clone + '_, _>, Either<[{integer}; 1], [{integer}; 1]>>`
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error: aborting due to 3 previous errors
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For more information about this error, try `rustc --explain E0277`.
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30
tests/ui/type-alias-impl-trait/lazy_subtyping_of_opaques.rs
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30
tests/ui/type-alias-impl-trait/lazy_subtyping_of_opaques.rs
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#![feature(type_alias_impl_trait)]
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//! This test used to ICE rust-lang/rust#124891
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//! because we added an assertion for catching cases where opaque types get
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//! registered during the processing of subtyping predicates.
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type Tait = impl FnOnce() -> ();
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fn reify_as_tait() -> Thunk<Tait> {
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Thunk::new(|cont| cont)
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//~^ ERROR: mismatched types
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//~| ERROR: mismatched types
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}
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struct Thunk<F>(F);
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impl<F> Thunk<F> {
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fn new(f: F)
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where
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F: ContFn,
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{
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todo!();
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}
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}
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trait ContFn {}
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impl<F: FnOnce(Tait) -> ()> ContFn for F {}
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fn main() {}
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error[E0308]: mismatched types
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--> $DIR/lazy_subtyping_of_opaques.rs:10:23
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LL | type Tait = impl FnOnce() -> ();
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| ------------------- the found opaque type
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...
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LL | Thunk::new(|cont| cont)
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| ^^^^ expected `()`, found opaque type
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= note: expected unit type `()`
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found opaque type `Tait`
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error[E0308]: mismatched types
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--> $DIR/lazy_subtyping_of_opaques.rs:10:5
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LL | fn reify_as_tait() -> Thunk<Tait> {
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| ----------- expected `Thunk<_>` because of return type
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LL | Thunk::new(|cont| cont)
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| ^^^^^^^^^^^^^^^^^^^^^^^ expected `Thunk<_>`, found `()`
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= note: expected struct `Thunk<_>`
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found unit type `()`
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0308`.
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