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Diffstat (limited to 'src/test/ui/feature-gates/feature-gate-object_safe_for_dispatch.stderr')
| -rw-r--r-- | src/test/ui/feature-gates/feature-gate-object_safe_for_dispatch.stderr | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/test/ui/feature-gates/feature-gate-object_safe_for_dispatch.stderr b/src/test/ui/feature-gates/feature-gate-object_safe_for_dispatch.stderr new file mode 100644 index 000000000..72cb4cc84 --- /dev/null +++ b/src/test/ui/feature-gates/feature-gate-object_safe_for_dispatch.stderr @@ -0,0 +1,83 @@ +error[E0038]: the trait `NonObjectSafe1` cannot be made into an object + --> $DIR/feature-gate-object_safe_for_dispatch.rs:18:39 + | +LL | fn takes_non_object_safe_ref<T>(obj: &dyn NonObjectSafe1) { + | ^^^^^^^^^^^^^^^^^^ `NonObjectSafe1` cannot be made into an object + | +note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety> + --> $DIR/feature-gate-object_safe_for_dispatch.rs:4:23 + | +LL | trait NonObjectSafe1: Sized {} + | -------------- ^^^^^ ...because it requires `Self: Sized` + | | + | this trait cannot be made into an object... + +error[E0038]: the trait `NonObjectSafe2` cannot be made into an object + --> $DIR/feature-gate-object_safe_for_dispatch.rs:22:36 + | +LL | fn return_non_object_safe_ref() -> &'static dyn NonObjectSafe2 { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ `NonObjectSafe2` cannot be made into an object + | +note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety> + --> $DIR/feature-gate-object_safe_for_dispatch.rs:7:8 + | +LL | trait NonObjectSafe2 { + | -------------- this trait cannot be made into an object... +LL | fn static_fn() {} + | ^^^^^^^^^ ...because associated function `static_fn` has no `self` parameter +help: consider turning `static_fn` into a method by giving it a `&self` argument + | +LL | fn static_fn(&self) {} + | +++++ +help: alternatively, consider constraining `static_fn` so it does not apply to trait objects + | +LL | fn static_fn() where Self: Sized {} + | +++++++++++++++++ + +error[E0038]: the trait `NonObjectSafe3` cannot be made into an object + --> $DIR/feature-gate-object_safe_for_dispatch.rs:27:39 + | +LL | fn takes_non_object_safe_box(obj: Box<dyn NonObjectSafe3>) { + | ^^^^^^^^^^^^^^^^^^ `NonObjectSafe3` cannot be made into an object + | +note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety> + --> $DIR/feature-gate-object_safe_for_dispatch.rs:11:8 + | +LL | trait NonObjectSafe3 { + | -------------- this trait cannot be made into an object... +LL | fn foo<T>(&self); + | ^^^ ...because method `foo` has generic type parameters + = help: consider moving `foo` to another trait + +error[E0038]: the trait `NonObjectSafe4` cannot be made into an object + --> $DIR/feature-gate-object_safe_for_dispatch.rs:31:35 + | +LL | fn return_non_object_safe_rc() -> std::rc::Rc<dyn NonObjectSafe4> { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `NonObjectSafe4` cannot be made into an object + | +note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety> + --> $DIR/feature-gate-object_safe_for_dispatch.rs:15:22 + | +LL | trait NonObjectSafe4 { + | -------------- this trait cannot be made into an object... +LL | fn foo(&self, s: &Self); + | ^^^^^ ...because method `foo` references the `Self` type in this parameter + = help: consider moving `foo` to another trait + +error[E0038]: the trait `NonObjectSafe1` cannot be made into an object + --> $DIR/feature-gate-object_safe_for_dispatch.rs:38:16 + | +LL | impl Trait for dyn NonObjectSafe1 {} + | ^^^^^^^^^^^^^^^^^^ `NonObjectSafe1` cannot be made into an object + | +note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety> + --> $DIR/feature-gate-object_safe_for_dispatch.rs:4:23 + | +LL | trait NonObjectSafe1: Sized {} + | -------------- ^^^^^ ...because it requires `Self: Sized` + | | + | this trait cannot be made into an object... + +error: aborting due to 5 previous errors + +For more information about this error, try `rustc --explain E0038`. |