diff options
Diffstat (limited to 'tests/ui/traits/non_lifetime_binders')
5 files changed, 55 insertions, 6 deletions
diff --git a/tests/ui/traits/non_lifetime_binders/bad-sized-cond.stderr b/tests/ui/traits/non_lifetime_binders/bad-sized-cond.stderr index ed9b57cb1..d8db07277 100644 --- a/tests/ui/traits/non_lifetime_binders/bad-sized-cond.stderr +++ b/tests/ui/traits/non_lifetime_binders/bad-sized-cond.stderr @@ -23,13 +23,13 @@ LL | where LL | for<V> V: Sized, | ^^^^^ required by this bound in `foo` -error[E0277]: the size for values of type `V` cannot be known at compilation time +error[E0277]: `V` is not an iterator --> $DIR/bad-sized-cond.rs:20:5 | LL | bar(); - | ^^^ doesn't have a size known at compile-time + | ^^^ `V` is not an iterator | - = help: the trait `Sized` is not implemented for `V` + = help: the trait `Iterator` is not implemented for `V` = note: required for `V` to implement `IntoIterator` note: required by a bound in `bar` --> $DIR/bad-sized-cond.rs:12:15 @@ -40,13 +40,13 @@ LL | where LL | for<V> V: IntoIterator, | ^^^^^^^^^^^^ required by this bound in `bar` -error[E0277]: `V` is not an iterator +error[E0277]: the size for values of type `V` cannot be known at compilation time --> $DIR/bad-sized-cond.rs:20:5 | LL | bar(); - | ^^^ `V` is not an iterator + | ^^^ doesn't have a size known at compile-time | - = help: the trait `Iterator` is not implemented for `V` + = help: the trait `Sized` is not implemented for `V` = note: required for `V` to implement `IntoIterator` note: required by a bound in `bar` --> $DIR/bad-sized-cond.rs:12:15 diff --git a/tests/ui/traits/non_lifetime_binders/disqualifying-object-candidates.rs b/tests/ui/traits/non_lifetime_binders/disqualifying-object-candidates.rs new file mode 100644 index 000000000..b999f251d --- /dev/null +++ b/tests/ui/traits/non_lifetime_binders/disqualifying-object-candidates.rs @@ -0,0 +1,19 @@ +// check-pass + +trait Foo { + type Bar<T> + where + dyn Send + 'static: Send; +} + +impl Foo for () { + type Bar<T> = i32; + // We take `<() as Foo>::Bar<T>: Sized` and normalize it under the where clause + // of `for<S> <() as Foo>::Bar<S> = i32`. This gives us back `i32: Send` with + // the nested obligation `(dyn Send + 'static): Send`. However, during candidate + // assembly for object types, we disqualify any obligations that has non-region + // late-bound vars in the param env(!), rather than just the predicate. This causes + // the where clause to not hold even though it trivially should. +} + +fn main() {} diff --git a/tests/ui/traits/non_lifetime_binders/on-rpit.rs b/tests/ui/traits/non_lifetime_binders/on-rpit.rs new file mode 100644 index 000000000..c501e057e --- /dev/null +++ b/tests/ui/traits/non_lifetime_binders/on-rpit.rs @@ -0,0 +1,16 @@ +// check-pass + +#![feature(non_lifetime_binders)] +//~^ WARN the feature `non_lifetime_binders` is incomplete + +trait Trait<T: ?Sized> {} + +impl<T: ?Sized> Trait<T> for i32 {} + +fn produce() -> impl for<T> Trait<T> { + 16 +} + +fn main() { + let _ = produce(); +} diff --git a/tests/ui/traits/non_lifetime_binders/on-rpit.stderr b/tests/ui/traits/non_lifetime_binders/on-rpit.stderr new file mode 100644 index 000000000..34c56068c --- /dev/null +++ b/tests/ui/traits/non_lifetime_binders/on-rpit.stderr @@ -0,0 +1,11 @@ +warning: the feature `non_lifetime_binders` is incomplete and may not be safe to use and/or cause compiler crashes + --> $DIR/on-rpit.rs:3:12 + | +LL | #![feature(non_lifetime_binders)] + | ^^^^^^^^^^^^^^^^^^^^ + | + = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information + = note: `#[warn(incomplete_features)]` on by default + +warning: 1 warning emitted + diff --git a/tests/ui/traits/non_lifetime_binders/supertrait-object-safety.stderr b/tests/ui/traits/non_lifetime_binders/supertrait-object-safety.stderr index d56519223..b6e540c5f 100644 --- a/tests/ui/traits/non_lifetime_binders/supertrait-object-safety.stderr +++ b/tests/ui/traits/non_lifetime_binders/supertrait-object-safety.stderr @@ -20,6 +20,7 @@ LL | trait Foo: for<T> Bar<T> {} | --- ^^^^^^^^^^^^^ ...because where clause cannot reference non-lifetime `for<...>` variables | | | this trait cannot be made into an object... + = help: only type `()` implements the trait, consider using it directly instead = note: required for the cast from `&()` to `&dyn Foo` error[E0038]: the trait `Foo` cannot be made into an object @@ -35,6 +36,7 @@ LL | trait Foo: for<T> Bar<T> {} | --- ^^^^^^^^^^^^^ ...because where clause cannot reference non-lifetime `for<...>` variables | | | this trait cannot be made into an object... + = help: only type `()` implements the trait, consider using it directly instead error[E0038]: the trait `Foo` cannot be made into an object --> $DIR/supertrait-object-safety.rs:22:5 @@ -49,6 +51,7 @@ LL | trait Foo: for<T> Bar<T> {} | --- ^^^^^^^^^^^^^ ...because where clause cannot reference non-lifetime `for<...>` variables | | | this trait cannot be made into an object... + = help: only type `()` implements the trait, consider using it directly instead error: aborting due to 3 previous errors; 1 warning emitted |