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Rename feature object_safe_for_dispatch to dyn_compatible_for_dispatch
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commit
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@ -154,6 +154,10 @@ declare_features! (
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/// then removed. But there was no utility storing it separately, so now
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/// it's in this list.
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(removed, no_stack_check, "1.0.0", None, None),
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/// Allows making `dyn Trait` well-formed even if `Trait` is not dyn-compatible (object safe).
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/// Renamed to `dyn_compatible_for_dispatch`.
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(removed, object_safe_for_dispatch, "CURRENT_RUSTC_VERSION", Some(43561),
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Some("renamed to `dyn_compatible_for_dispatch`")),
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/// Allows using `#[on_unimplemented(..)]` on traits.
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/// (Moved to `rustc_attrs`.)
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(removed, on_unimplemented, "1.40.0", None, None),
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@ -259,6 +259,14 @@ declare_features! (
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(unstable, doc_notable_trait, "1.52.0", Some(45040)),
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/// Allows using the `may_dangle` attribute (RFC 1327).
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(unstable, dropck_eyepatch, "1.10.0", Some(34761)),
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/// Allows making `dyn Trait` well-formed even if `Trait` is not dyn-compatible[^1].
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/// In that case, `dyn Trait: Trait` does not hold. Moreover, coercions and
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/// casts in safe Rust to `dyn Trait` for such a `Trait` is also forbidden.
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///
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/// Renamed from `object_safe_for_dispatch`.
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///
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/// [^1]: Formerly known as "object safe".
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(unstable, dyn_compatible_for_dispatch, "CURRENT_RUSTC_VERSION", Some(43561)),
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/// Allows using the `#[fundamental]` attribute.
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(unstable, fundamental, "1.0.0", Some(29635)),
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/// Allows using `#[link_name="llvm.*"]`.
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@ -544,13 +552,6 @@ declare_features! (
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(unstable, non_exhaustive_omitted_patterns_lint, "1.57.0", Some(89554)),
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/// Allows `for<T>` binders in where-clauses
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(incomplete, non_lifetime_binders, "1.69.0", Some(108185)),
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/// Allows making `dyn Trait` well-formed even if `Trait` is not dyn-compatible[^1].
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/// In that case, `dyn Trait: Trait` does not hold. Moreover, coercions and
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/// casts in safe Rust to `dyn Trait` for such a `Trait` is also forbidden.
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///
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/// [^1]: Formerly known as "object safe".
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// FIXME(dyn_compat_renaming): Rename feature.
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(unstable, object_safe_for_dispatch, "1.40.0", Some(43561)),
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/// Allows using enums in offset_of!
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(unstable, offset_of_enum, "1.75.0", Some(120141)),
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/// Allows using fields with slice type in offset_of!
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@ -199,7 +199,7 @@ fn check_object_overlap<'tcx>(
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for component_def_id in component_def_ids {
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if !tcx.is_dyn_compatible(component_def_id) {
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// FIXME(dyn_compat_renaming): Rename test and update comment.
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// Without the 'object_safe_for_dispatch' feature this is an error
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// Without the 'dyn_compatible_for_dispatch' feature this is an error
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// which will be reported by wfcheck. Ignore it here.
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// This is tested by `coherence-impl-trait-for-trait-object-safe.rs`.
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// With the feature enabled, the trait is not implemented automatically,
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@ -776,6 +776,7 @@ symbols! {
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dropck_eyepatch,
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dropck_parametricity,
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dylib,
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dyn_compatible_for_dispatch,
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dyn_metadata,
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dyn_star,
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dyn_trait,
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@ -639,8 +639,8 @@ fn object_ty_for_trait<'tcx>(
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/// contained by the trait object, because the object that needs to be coerced is behind
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/// a pointer.
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///
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/// In practice, we cannot use `dyn Trait` explicitly in the obligation because it would result
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/// in a new check that `Trait` is dyn-compatible, creating a cycle (until object_safe_for_dispatch
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/// In practice, we cannot use `dyn Trait` explicitly in the obligation because it would result in
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/// a new check that `Trait` is dyn-compatible, creating a cycle (until dyn_compatible_for_dispatch
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/// is stabilized, see tracking issue <https://github.com/rust-lang/rust/issues/43561>).
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/// Instead, we fudge a little by introducing a new type parameter `U` such that
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/// `Self: Unsize<U>` and `U: Trait + ?Sized`, and use `U` in place of `dyn Trait`.
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@ -674,7 +674,7 @@ fn receiver_is_dispatchable<'tcx>(
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// the type `U` in the query
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// use a bogus type parameter to mimic a forall(U) query using u32::MAX for now.
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// FIXME(mikeyhew) this is a total hack. Once object_safe_for_dispatch is stabilized, we can
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// FIXME(mikeyhew) this is a total hack. Once dyn_compatible_for_dispatch is stabilized, we can
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// replace this with `dyn Trait`
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let unsized_self_ty: Ty<'tcx> =
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Ty::new_param(tcx, u32::MAX, Symbol::intern("RustaceansAreAwesome"));
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@ -881,7 +881,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
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}
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if let Some(principal) = data.principal() {
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if !self.infcx.tcx.features().object_safe_for_dispatch {
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if !self.infcx.tcx.features().dyn_compatible_for_dispatch {
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principal.with_self_ty(self.tcx(), self_ty)
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} else if self.tcx().is_dyn_compatible(principal.def_id()) {
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principal.with_self_ty(self.tcx(), self_ty)
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@ -829,7 +829,7 @@ impl<'a, 'tcx> TypeVisitor<TyCtxt<'tcx>> for WfPredicates<'a, 'tcx> {
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// obligations that don't refer to Self and
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// checking those
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let defer_to_coercion = tcx.features().object_safe_for_dispatch;
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let defer_to_coercion = tcx.features().dyn_compatible_for_dispatch;
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if !defer_to_coercion {
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if let Some(principal) = data.principal_def_id() {
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@ -1,6 +1,6 @@
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//@ known-bug: #120241
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//@ edition:2021
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#![feature(object_safe_for_dispatch)]
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#![feature(dyn_compatible_for_dispatch)]
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#![feature(unsized_fn_params)]
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fn guard(_s: Copy) -> bool {
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@ -1,6 +1,6 @@
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//@ known-bug: #120241
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//@ edition:2021
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#![feature(object_safe_for_dispatch)]
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#![feature(dyn_compatible_for_dispatch)]
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trait B {
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fn f(a: A) -> A;
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@ -1,6 +1,6 @@
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//@ known-bug: #120482
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//@ edition:2021
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#![feature(object_safe_for_dispatch)]
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#![feature(dyn_compatible_for_dispatch)]
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trait B {
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fn bar(&self, x: &Self);
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@ -1,6 +1,6 @@
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//@ known-bug: rust-lang/rust#125512
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//@ edition:2021
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#![feature(object_safe_for_dispatch)]
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#![feature(dyn_compatible_for_dispatch)]
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trait B {
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fn f(a: A) -> A;
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}
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@ -1,7 +1,7 @@
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//@ known-bug: rust-lang/rust#128176
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#![feature(generic_const_exprs)]
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#![feature(object_safe_for_dispatch)]
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#![feature(dyn_compatible_for_dispatch)]
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trait X {
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type Y<const N: i16>;
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}
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@ -1,6 +1,6 @@
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//@ known-bug: #130521
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#![feature(object_safe_for_dispatch)]
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#![feature(dyn_compatible_for_dispatch)]
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struct Vtable(dyn Cap);
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trait Cap<'a> {}
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@ -1,7 +1,7 @@
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// Check that unsafe trait object do not implement themselves
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// automatically
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#![feature(object_safe_for_dispatch)]
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#![feature(dyn_compatible_for_dispatch)]
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trait Trait: Sized {
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fn call(&self);
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@ -0,0 +1,41 @@
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// Test that the use of the dyn-incompatible trait objects
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// are gated by the `dyn_compatible_for_dispatch` feature gate.
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trait DynIncompatible1: Sized {}
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trait DynIncompatible2 {
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fn static_fn() {}
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}
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trait DynIncompatible3 {
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fn foo<T>(&self);
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}
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trait DynIncompatible4 {
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fn foo(&self, s: &Self);
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}
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fn takes_non_object_safe_ref<T>(obj: &dyn DynIncompatible1) {
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//~^ ERROR E0038
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}
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fn return_non_object_safe_ref() -> &'static dyn DynIncompatible2 {
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//~^ ERROR E0038
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loop {}
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}
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fn takes_non_object_safe_box(obj: Box<dyn DynIncompatible3>) {
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//~^ ERROR E0038
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}
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fn return_non_object_safe_rc() -> std::rc::Rc<dyn DynIncompatible4> {
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//~^ ERROR E0038
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loop {}
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}
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trait Trait {}
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impl Trait for dyn DynIncompatible1 {}
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//~^ ERROR E0038
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fn main() {}
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@ -1,28 +1,28 @@
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error[E0038]: the trait `NonObjectSafe1` cannot be made into an object
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--> $DIR/feature-gate-object_safe_for_dispatch.rs:18:39
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error[E0038]: the trait `DynIncompatible1` cannot be made into an object
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--> $DIR/feature-gate-dyn_compatible_for_dispatch.rs:18:39
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LL | fn takes_non_object_safe_ref<T>(obj: &dyn NonObjectSafe1) {
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| ^^^^^^^^^^^^^^^^^^ `NonObjectSafe1` cannot be made into an object
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LL | fn takes_non_object_safe_ref<T>(obj: &dyn DynIncompatible1) {
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| ^^^^^^^^^^^^^^^^^^^^ `DynIncompatible1` cannot be made into an object
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note: for a trait to be "dyn-compatible" 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>
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--> $DIR/feature-gate-object_safe_for_dispatch.rs:4:23
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--> $DIR/feature-gate-dyn_compatible_for_dispatch.rs:4:25
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LL | trait NonObjectSafe1: Sized {}
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| -------------- ^^^^^ ...because it requires `Self: Sized`
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LL | trait DynIncompatible1: Sized {}
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| ---------------- ^^^^^ ...because it requires `Self: Sized`
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| |
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| this trait cannot be made into an object...
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error[E0038]: the trait `NonObjectSafe2` cannot be made into an object
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--> $DIR/feature-gate-object_safe_for_dispatch.rs:22:45
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error[E0038]: the trait `DynIncompatible2` cannot be made into an object
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--> $DIR/feature-gate-dyn_compatible_for_dispatch.rs:22:45
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LL | fn return_non_object_safe_ref() -> &'static dyn NonObjectSafe2 {
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| ^^^^^^^^^^^^^^^^^^ `NonObjectSafe2` cannot be made into an object
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LL | fn return_non_object_safe_ref() -> &'static dyn DynIncompatible2 {
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| ^^^^^^^^^^^^^^^^^^^^ `DynIncompatible2` cannot be made into an object
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note: for a trait to be "dyn-compatible" 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>
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--> $DIR/feature-gate-object_safe_for_dispatch.rs:7:8
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--> $DIR/feature-gate-dyn_compatible_for_dispatch.rs:7:8
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LL | trait NonObjectSafe2 {
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| -------------- this trait cannot be made into an object...
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LL | trait DynIncompatible2 {
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| ---------------- this trait cannot be made into an object...
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LL | fn static_fn() {}
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| ^^^^^^^^^ ...because associated function `static_fn` has no `self` parameter
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help: consider turning `static_fn` into a method by giving it a `&self` argument
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@ -34,47 +34,47 @@ help: alternatively, consider constraining `static_fn` so it does not apply to t
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LL | fn static_fn() where Self: Sized {}
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| +++++++++++++++++
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error[E0038]: the trait `NonObjectSafe3` cannot be made into an object
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--> $DIR/feature-gate-object_safe_for_dispatch.rs:27:39
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error[E0038]: the trait `DynIncompatible3` cannot be made into an object
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--> $DIR/feature-gate-dyn_compatible_for_dispatch.rs:27:39
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LL | fn takes_non_object_safe_box(obj: Box<dyn NonObjectSafe3>) {
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| ^^^^^^^^^^^^^^^^^^ `NonObjectSafe3` cannot be made into an object
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LL | fn takes_non_object_safe_box(obj: Box<dyn DynIncompatible3>) {
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| ^^^^^^^^^^^^^^^^^^^^ `DynIncompatible3` cannot be made into an object
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note: for a trait to be "dyn-compatible" 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>
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--> $DIR/feature-gate-object_safe_for_dispatch.rs:11:8
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--> $DIR/feature-gate-dyn_compatible_for_dispatch.rs:11:8
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LL | trait NonObjectSafe3 {
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| -------------- this trait cannot be made into an object...
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LL | trait DynIncompatible3 {
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| ---------------- this trait cannot be made into an object...
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LL | fn foo<T>(&self);
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| ^^^ ...because method `foo` has generic type parameters
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= help: consider moving `foo` to another trait
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error[E0038]: the trait `NonObjectSafe4` cannot be made into an object
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--> $DIR/feature-gate-object_safe_for_dispatch.rs:31:47
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error[E0038]: the trait `DynIncompatible4` cannot be made into an object
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--> $DIR/feature-gate-dyn_compatible_for_dispatch.rs:31:47
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LL | fn return_non_object_safe_rc() -> std::rc::Rc<dyn NonObjectSafe4> {
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| ^^^^^^^^^^^^^^^^^^ `NonObjectSafe4` cannot be made into an object
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LL | fn return_non_object_safe_rc() -> std::rc::Rc<dyn DynIncompatible4> {
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| ^^^^^^^^^^^^^^^^^^^^ `DynIncompatible4` cannot be made into an object
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|
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note: for a trait to be "dyn-compatible" 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>
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--> $DIR/feature-gate-object_safe_for_dispatch.rs:15:22
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--> $DIR/feature-gate-dyn_compatible_for_dispatch.rs:15:22
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LL | trait NonObjectSafe4 {
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| -------------- this trait cannot be made into an object...
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LL | trait DynIncompatible4 {
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| ---------------- this trait cannot be made into an object...
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LL | fn foo(&self, s: &Self);
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| ^^^^^ ...because method `foo` references the `Self` type in this parameter
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= help: consider moving `foo` to another trait
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error[E0038]: the trait `NonObjectSafe1` cannot be made into an object
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--> $DIR/feature-gate-object_safe_for_dispatch.rs:38:16
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error[E0038]: the trait `DynIncompatible1` cannot be made into an object
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--> $DIR/feature-gate-dyn_compatible_for_dispatch.rs:38:16
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|
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LL | impl Trait for dyn NonObjectSafe1 {}
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| ^^^^^^^^^^^^^^^^^^ `NonObjectSafe1` cannot be made into an object
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LL | impl Trait for dyn DynIncompatible1 {}
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| ^^^^^^^^^^^^^^^^^^^^ `DynIncompatible1` cannot be made into an object
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|
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note: for a trait to be "dyn-compatible" 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>
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--> $DIR/feature-gate-object_safe_for_dispatch.rs:4:23
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--> $DIR/feature-gate-dyn_compatible_for_dispatch.rs:4:25
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|
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LL | trait NonObjectSafe1: Sized {}
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| -------------- ^^^^^ ...because it requires `Self: Sized`
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LL | trait DynIncompatible1: Sized {}
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| ---------------- ^^^^^ ...because it requires `Self: Sized`
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| |
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| this trait cannot be made into an object...
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@ -1,41 +0,0 @@
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// Test that the use of the non object-safe trait objects
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// are gated by `object_safe_for_dispatch` feature gate.
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trait NonObjectSafe1: Sized {}
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trait NonObjectSafe2 {
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fn static_fn() {}
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}
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trait NonObjectSafe3 {
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fn foo<T>(&self);
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}
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trait NonObjectSafe4 {
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fn foo(&self, s: &Self);
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}
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fn takes_non_object_safe_ref<T>(obj: &dyn NonObjectSafe1) {
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//~^ ERROR E0038
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}
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fn return_non_object_safe_ref() -> &'static dyn NonObjectSafe2 {
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//~^ ERROR E0038
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loop {}
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}
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fn takes_non_object_safe_box(obj: Box<dyn NonObjectSafe3>) {
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//~^ ERROR E0038
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}
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fn return_non_object_safe_rc() -> std::rc::Rc<dyn NonObjectSafe4> {
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//~^ ERROR E0038
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loop {}
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}
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trait Trait {}
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impl Trait for dyn NonObjectSafe1 {}
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//~^ ERROR E0038
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fn main() {}
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@ -1,8 +1,8 @@
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// Test that Copy bounds inherited by trait are checked.
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//
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//@ revisions: curr object_safe_for_dispatch
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//@ revisions: curr dyn_compatible_for_dispatch
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#![cfg_attr(object_safe_for_dispatch, feature(object_safe_for_dispatch))]
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#![cfg_attr(dyn_compatible_for_dispatch, feature(dyn_compatible_for_dispatch))]
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use std::any::Any;
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@ -19,7 +19,7 @@ fn take_param<T:Foo>(foo: &T) { }
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fn a() {
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let x: Box<_> = Box::new(3);
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take_param(&x); //[curr]~ ERROR E0277
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//[object_safe_for_dispatch]~^ ERROR E0277
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//[dyn_compatible_for_dispatch]~^ ERROR E0277
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}
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fn b() {
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@ -28,7 +28,7 @@ fn b() {
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let z = &x as &dyn Foo;
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//[curr]~^ ERROR E0038
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//[curr]~| ERROR E0038
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//[object_safe_for_dispatch]~^^^ ERROR E0038
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//[dyn_compatible_for_dispatch]~^^^ ERROR E0038
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}
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fn main() { }
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@ -1,9 +1,9 @@
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// Check that we correctly prevent users from making trait objects
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// from traits with associated consts.
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//
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//@ revisions: curr object_safe_for_dispatch
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//@ revisions: curr dyn_compatible_for_dispatch
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#![cfg_attr(object_safe_for_dispatch, feature(object_safe_for_dispatch))]
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#![cfg_attr(dyn_compatible_for_dispatch, feature(dyn_compatible_for_dispatch))]
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trait Bar {
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const X: usize;
|
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|
@ -1,9 +1,9 @@
|
||||
// Check that we correctly prevent users from making trait objects
|
||||
// from traits with generic methods, unless `where Self : Sized` is
|
||||
// present.
|
||||
//@ revisions: curr object_safe_for_dispatch
|
||||
//@ revisions: curr dyn_compatible_for_dispatch
|
||||
|
||||
#![cfg_attr(object_safe_for_dispatch, feature(object_safe_for_dispatch))]
|
||||
#![cfg_attr(dyn_compatible_for_dispatch, feature(dyn_compatible_for_dispatch))]
|
||||
|
||||
|
||||
trait Bar {
|
||||
@ -18,14 +18,14 @@ trait Quux {
|
||||
fn make_bar<T:Bar>(t: &T) -> &dyn Bar {
|
||||
//[curr]~^ ERROR E0038
|
||||
t
|
||||
//[object_safe_for_dispatch]~^ ERROR E0038
|
||||
//[dyn_compatible_for_dispatch]~^ ERROR E0038
|
||||
//[curr]~^^ ERROR E0038
|
||||
}
|
||||
|
||||
fn make_bar_explicit<T:Bar>(t: &T) -> &dyn Bar {
|
||||
//[curr]~^ ERROR E0038
|
||||
t as &dyn Bar
|
||||
//[object_safe_for_dispatch]~^ ERROR E0038
|
||||
//[dyn_compatible_for_dispatch]~^ ERROR E0038
|
||||
//[curr]~^^ ERROR E0038
|
||||
//[curr]~| ERROR E0038
|
||||
}
|
||||
|
@ -2,9 +2,9 @@
|
||||
// form traits that make use of `Self` in an argument or return
|
||||
// position, unless `where Self : Sized` is present..
|
||||
//
|
||||
//@ revisions: curr object_safe_for_dispatch
|
||||
//@ revisions: curr dyn_compatible_for_dispatch
|
||||
|
||||
#![cfg_attr(object_safe_for_dispatch, feature(object_safe_for_dispatch))]
|
||||
#![cfg_attr(dyn_compatible_for_dispatch, feature(dyn_compatible_for_dispatch))]
|
||||
|
||||
|
||||
trait Bar {
|
||||
|
@ -1,9 +1,9 @@
|
||||
// Check that we correctly prevent users from making trait objects
|
||||
// from traits with static methods.
|
||||
//
|
||||
//@ revisions: curr object_safe_for_dispatch
|
||||
//@ revisions: curr dyn_compatible_for_dispatch
|
||||
|
||||
#![cfg_attr(object_safe_for_dispatch, feature(object_safe_for_dispatch))]
|
||||
#![cfg_attr(dyn_compatible_for_dispatch, feature(dyn_compatible_for_dispatch))]
|
||||
|
||||
trait Foo {
|
||||
fn foo() {}
|
||||
|
@ -1,9 +1,9 @@
|
||||
// Check that we correctly prevent users from making trait objects
|
||||
// from traits where `Self : Sized`.
|
||||
//
|
||||
//@ revisions: curr object_safe_for_dispatch
|
||||
//@ revisions: curr dyn_compatible_for_dispatch
|
||||
|
||||
#![cfg_attr(object_safe_for_dispatch, feature(object_safe_for_dispatch))]
|
||||
#![cfg_attr(dyn_compatible_for_dispatch, feature(dyn_compatible_for_dispatch))]
|
||||
|
||||
trait Bar
|
||||
where Self : Sized
|
||||
|
@ -1,9 +1,9 @@
|
||||
// Check that we correctly prevent users from making trait objects
|
||||
// from traits where `Self : Sized`.
|
||||
//
|
||||
//@ revisions: curr object_safe_for_dispatch
|
||||
//@ revisions: curr dyn_compatible_for_dispatch
|
||||
|
||||
#![cfg_attr(object_safe_for_dispatch, feature(object_safe_for_dispatch))]
|
||||
#![cfg_attr(dyn_compatible_for_dispatch, feature(dyn_compatible_for_dispatch))]
|
||||
|
||||
trait Bar: Sized {
|
||||
fn bar<T>(&self, t: T);
|
||||
|
@ -3,7 +3,7 @@
|
||||
//
|
||||
//@ check-pass
|
||||
|
||||
#![feature(object_safe_for_dispatch)]
|
||||
#![feature(dyn_compatible_for_dispatch)]
|
||||
|
||||
trait Trait: Sized {}
|
||||
|
@ -5,7 +5,7 @@
|
||||
//@[next] compile-flags: -Znext-solver
|
||||
//@ run-pass
|
||||
|
||||
#![feature(object_safe_for_dispatch)]
|
||||
#![feature(dyn_compatible_for_dispatch)]
|
||||
|
||||
trait Bad {
|
||||
fn stat() -> char {
|
@ -3,7 +3,7 @@
|
||||
//
|
||||
//@ check-pass
|
||||
|
||||
#![feature(object_safe_for_dispatch)]
|
||||
#![feature(dyn_compatible_for_dispatch)]
|
||||
|
||||
trait Statics {
|
||||
fn plain() {}
|
@ -1,6 +1,6 @@
|
||||
//@ revisions: curr object_safe_for_dispatch
|
||||
//@ revisions: curr dyn_compatible_for_dispatch
|
||||
|
||||
#![cfg_attr(object_safe_for_dispatch, feature(object_safe_for_dispatch))]
|
||||
#![cfg_attr(dyn_compatible_for_dispatch, feature(dyn_compatible_for_dispatch))]
|
||||
|
||||
use std::rc::Rc;
|
||||
|
||||
@ -33,7 +33,7 @@ fn make_foo() {
|
||||
let x = Rc::new(5usize) as Rc<dyn Foo>;
|
||||
//[curr]~^ ERROR E0038
|
||||
//[curr]~| ERROR E0038
|
||||
//[object_safe_for_dispatch]~^^^ ERROR E0038
|
||||
//[dyn_compatible_for_dispatch]~^^^ ERROR E0038
|
||||
}
|
||||
|
||||
fn make_bar() {
|
||||
|
@ -1,4 +1,4 @@
|
||||
#![feature(object_safe_for_dispatch)]
|
||||
#![feature(dyn_compatible_for_dispatch)]
|
||||
|
||||
trait Foo {
|
||||
fn f() {}
|
||||
|
@ -1,7 +1,7 @@
|
||||
// Check that we do not allow casts or coercions
|
||||
// to object unsafe trait objects inside a Box
|
||||
|
||||
#![feature(object_safe_for_dispatch)]
|
||||
#![feature(dyn_compatible_for_dispatch)]
|
||||
|
||||
trait Trait: Sized {}
|
||||
|
||||
|
@ -1,7 +1,7 @@
|
||||
// Check that we do not allow casts or coercions
|
||||
// to object unsafe trait objects by ref
|
||||
|
||||
#![feature(object_safe_for_dispatch)]
|
||||
#![feature(dyn_compatible_for_dispatch)]
|
||||
|
||||
trait Trait: Sized {}
|
||||
|
||||
|
@ -1,7 +1,7 @@
|
||||
// Check that we do not allow coercions to object
|
||||
// unsafe trait objects in match arms
|
||||
|
||||
#![feature(object_safe_for_dispatch)]
|
||||
#![feature(dyn_compatible_for_dispatch)]
|
||||
|
||||
trait Trait: Sized {}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user