Rollup merge of #134573 - lukas-code:unimpl-dyn-pointerlike, r=compiler-errors

unimplement `PointerLike` for trait objects

Values of type `dyn* PointerLike` or `dyn PointerLike` are not pointer-like so these types should not implement `PointerLike`.

After https://github.com/rust-lang/rust/pull/133226, `PointerLike` allows user implementations, so we can't just mark it with `#[rustc_deny_explicit_impl(implement_via_object = false)]`. Instead, this PR splits the `#[rustc_deny_explicit_impl(implement_via_object = ...)]` attribute into two separate attributes `#[rustc_deny_explicit_impl]` and `#[rustc_do_not_implement_via_object]` so that we opt out of the automatic `impl PointerLike for dyn PointerLike` and still allow user implementations.

For traits that are marked with `#[do_not_implement_via_object]` but not `#[rustc_deny_explicit_impl]` I've also made it possible to add a manual `impl Trait for dyn Trait`. There is no immediate need for this, but it was one line to implement and seems nice to have.

fixes https://github.com/rust-lang/rust/issues/134545
fixes https://github.com/rust-lang/rust/issues/134543

r? `@compiler-errors`

compiler/rustc_feature/src/builtin_attrs.rs

@@ -912,11 +912,20 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     rustc_attr!(
         rustc_deny_explicit_impl,
         AttributeType::Normal,
-        template!(List: "implement_via_object = (true|false)"),
+        template!(Word),
         ErrorFollowing,
         EncodeCrossCrate::No,
         "#[rustc_deny_explicit_impl] enforces that a trait can have no user-provided impls"
     ),
+    rustc_attr!(
+        rustc_do_not_implement_via_object,
+        AttributeType::Normal,
+        template!(Word),
+        ErrorFollowing,
+        EncodeCrossCrate::No,
+        "#[rustc_do_not_implement_via_object] opts out of the automatic trait impl for trait objects \
+        (`impl Trait for dyn Trait`)"
+    ),
     rustc_attr!(
         rustc_has_incoherent_inherent_impls, AttributeType::Normal, template!(Word),
         ErrorFollowing, EncodeCrossCrate::Yes,

compiler/rustc_hir_analysis/src/coherence/mod.rs

@@ -206,7 +206,9 @@ fn check_object_overlap<'tcx>(
                 // so this is valid.
             } else {
                 let mut supertrait_def_ids = tcx.supertrait_def_ids(component_def_id);
-                if supertrait_def_ids.any(|d| d == trait_def_id) {
+                if supertrait_def_ids
+                    .any(|d| d == trait_def_id && tcx.trait_def(d).implement_via_object)
+                {
                     let span = tcx.def_span(impl_def_id);
                     return Err(struct_span_code_err!(
                         tcx.dcx(),

compiler/rustc_hir_analysis/src/collect.rs

@@ -1261,49 +1261,8 @@ fn trait_def(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::TraitDef {
             no_dups.then_some(list)
         });
 
-    let mut deny_explicit_impl = false;
+    let deny_explicit_impl = tcx.has_attr(def_id, sym::rustc_deny_explicit_impl);
-    let mut implement_via_object = true;
+    let implement_via_object = !tcx.has_attr(def_id, sym::rustc_do_not_implement_via_object);
-    if let Some(attr) = tcx.get_attr(def_id, sym::rustc_deny_explicit_impl) {
-        deny_explicit_impl = true;
-        let mut seen_attr = false;
-        for meta in attr.meta_item_list().iter().flatten() {
-            if let Some(meta) = meta.meta_item()
-                && meta.name_or_empty() == sym::implement_via_object
-                && let Some(lit) = meta.name_value_literal()
-            {
-                if seen_attr {
-                    tcx.dcx().span_err(meta.span, "duplicated `implement_via_object` meta item");
-                }
-                seen_attr = true;
-
-                match lit.symbol {
-                    kw::True => {
-                        implement_via_object = true;
-                    }
-                    kw::False => {
-                        implement_via_object = false;
-                    }
-                    _ => {
-                        tcx.dcx().span_err(
-                            meta.span,
-                            format!(
-                                "unknown literal passed to `implement_via_object` attribute: {}",
-                                lit.symbol
-                            ),
-                        );
-                    }
-                }
-            } else {
-                tcx.dcx().span_err(
-                    meta.span(),
-                    format!("unknown meta item passed to `rustc_deny_explicit_impl` {meta:?}"),
-                );
-            }
-        }
-        if !seen_attr {
-            tcx.dcx().span_err(attr.span, "missing `implement_via_object` meta item");
-        }
-    }
 
     ty::TraitDef {
         def_id: def_id.to_def_id(),

compiler/rustc_middle/src/ty/trait_def.rs

@@ -70,12 +70,12 @@ pub struct TraitDef {
 
     /// Whether to add a builtin `dyn Trait: Trait` implementation.
     /// This is enabled for all traits except ones marked with
-    /// `#[rustc_deny_explicit_impl(implement_via_object = false)]`.
+    /// `#[rustc_do_not_implement_via_object]`.
     pub implement_via_object: bool,
 
     /// Whether a trait is fully built-in, and any implementation is disallowed.
     /// This only applies to built-in traits, and is marked via
-    /// `#[rustc_deny_explicit_impl(implement_via_object = ...)]`.
+    /// `#[rustc_deny_explicit_impl]`.
     pub deny_explicit_impl: bool,
 }
 

compiler/rustc_passes/src/check_attr.rs

@@ -186,6 +186,7 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                 [sym::rustc_coinductive, ..]
                 | [sym::rustc_must_implement_one_of, ..]
                 | [sym::rustc_deny_explicit_impl, ..]
+                | [sym::rustc_do_not_implement_via_object, ..]
                 | [sym::const_trait, ..] => self.check_must_be_applied_to_trait(attr, span, target),
                 [sym::collapse_debuginfo, ..] => self.check_collapse_debuginfo(attr, span, target),
                 [sym::must_not_suspend, ..] => self.check_must_not_suspend(attr, span, target),

compiler/rustc_span/src/symbol.rs

@@ -1717,6 +1717,7 @@ symbols! {
         rustc_diagnostic_macros,
         rustc_dirty,
         rustc_do_not_const_check,
+        rustc_do_not_implement_via_object,
         rustc_doc_primitive,
         rustc_driver,
         rustc_dummy,

library/core/src/future/async_drop.rs

@@ -133,7 +133,9 @@ pub trait AsyncDrop {
 }
 
 #[lang = "async_destruct"]
-#[rustc_deny_explicit_impl(implement_via_object = false)]
+#[cfg_attr(bootstrap, rustc_deny_explicit_impl(implement_via_object = false))]
+#[cfg_attr(not(bootstrap), rustc_deny_explicit_impl)]
+#[cfg_attr(not(bootstrap), rustc_do_not_implement_via_object)]
 trait AsyncDestruct {
     type AsyncDestructor: Future<Output = ()>;
 }

library/core/src/marker.rs

@@ -141,7 +141,9 @@ unsafe impl<T: Sync + ?Sized> Send for &T {}
 )]
 #[fundamental] // for Default, for example, which requires that `[T]: !Default` be evaluatable
 #[rustc_specialization_trait]
-#[rustc_deny_explicit_impl(implement_via_object = false)]
+#[cfg_attr(bootstrap, rustc_deny_explicit_impl(implement_via_object = false))]
+#[cfg_attr(not(bootstrap), rustc_deny_explicit_impl)]
+#[cfg_attr(not(bootstrap), rustc_do_not_implement_via_object)]
 #[rustc_coinductive]
 pub trait Sized {
     // Empty.
@@ -181,7 +183,9 @@ pub trait Sized {
 /// [^1]: Formerly known as *object safe*.
 #[unstable(feature = "unsize", issue = "18598")]
 #[lang = "unsize"]
-#[rustc_deny_explicit_impl(implement_via_object = false)]
+#[cfg_attr(bootstrap, rustc_deny_explicit_impl(implement_via_object = false))]
+#[cfg_attr(not(bootstrap), rustc_deny_explicit_impl)]
+#[cfg_attr(not(bootstrap), rustc_do_not_implement_via_object)]
 pub trait Unsize<T: ?Sized> {
     // Empty.
 }
@@ -815,7 +819,9 @@ impl<T: ?Sized> StructuralPartialEq for PhantomData<T> {}
     reason = "this trait is unlikely to ever be stabilized, use `mem::discriminant` instead"
 )]
 #[lang = "discriminant_kind"]
-#[rustc_deny_explicit_impl(implement_via_object = false)]
+#[cfg_attr(bootstrap, rustc_deny_explicit_impl(implement_via_object = false))]
+#[cfg_attr(not(bootstrap), rustc_deny_explicit_impl)]
+#[cfg_attr(not(bootstrap), rustc_do_not_implement_via_object)]
 pub trait DiscriminantKind {
     /// The type of the discriminant, which must satisfy the trait
     /// bounds required by `mem::Discriminant`.
@@ -956,7 +962,9 @@ marker_impls! {
 #[unstable(feature = "const_destruct", issue = "133214")]
 #[lang = "destruct"]
 #[rustc_on_unimplemented(message = "can't drop `{Self}`", append_const_msg)]
-#[rustc_deny_explicit_impl(implement_via_object = false)]
+#[cfg_attr(bootstrap, rustc_deny_explicit_impl(implement_via_object = false))]
+#[cfg_attr(not(bootstrap), rustc_deny_explicit_impl)]
+#[cfg_attr(not(bootstrap), rustc_do_not_implement_via_object)]
 #[cfg_attr(not(bootstrap), const_trait)]
 pub trait Destruct {}
 
@@ -967,19 +975,22 @@ pub trait Destruct {}
 #[unstable(feature = "tuple_trait", issue = "none")]
 #[lang = "tuple_trait"]
 #[diagnostic::on_unimplemented(message = "`{Self}` is not a tuple")]
-#[rustc_deny_explicit_impl(implement_via_object = false)]
+#[cfg_attr(bootstrap, rustc_deny_explicit_impl(implement_via_object = false))]
+#[cfg_attr(not(bootstrap), rustc_deny_explicit_impl)]
+#[cfg_attr(not(bootstrap), rustc_do_not_implement_via_object)]
 pub trait Tuple {}
 
 /// A marker for pointer-like types.
 ///
-/// All types that have the same size and alignment as a `usize` or
+/// This trait can only be implemented for types that have the same size and alignment
-/// `*const ()` automatically implement this trait.
+/// as a `usize` or `*const ()`.
 #[unstable(feature = "pointer_like_trait", issue = "none")]
 #[lang = "pointer_like"]
 #[diagnostic::on_unimplemented(
     message = "`{Self}` needs to have the same ABI as a pointer",
     label = "`{Self}` needs to be a pointer-like type"
 )]
+#[cfg_attr(not(bootstrap), rustc_do_not_implement_via_object)]
 pub trait PointerLike {}
 
 #[cfg(not(bootstrap))]
@@ -1068,7 +1079,9 @@ marker_impls! {
     reason = "internal trait for implementing various traits for all function pointers"
 )]
 #[lang = "fn_ptr_trait"]
-#[rustc_deny_explicit_impl(implement_via_object = false)]
+#[cfg_attr(bootstrap, rustc_deny_explicit_impl(implement_via_object = false))]
+#[cfg_attr(not(bootstrap), rustc_deny_explicit_impl)]
+#[cfg_attr(not(bootstrap), rustc_do_not_implement_via_object)]
 pub trait FnPtr: Copy + Clone {
     /// Returns the address of the function pointer.
     #[lang = "fn_ptr_addr"]

library/core/src/mem/transmutability.rs

@@ -84,7 +84,9 @@ use crate::marker::{ConstParamTy_, UnsizedConstParamTy};
 /// `usize` is stable, but not portable.
 #[unstable(feature = "transmutability", issue = "99571")]
 #[lang = "transmute_trait"]
-#[rustc_deny_explicit_impl(implement_via_object = false)]
+#[cfg_attr(bootstrap, rustc_deny_explicit_impl(implement_via_object = false))]
+#[cfg_attr(not(bootstrap), rustc_deny_explicit_impl)]
+#[cfg_attr(not(bootstrap), rustc_do_not_implement_via_object)]
 #[rustc_coinductive]
 pub unsafe trait TransmuteFrom<Src, const ASSUME: Assume = { Assume::NOTHING }>
 where

library/core/src/ptr/metadata.rs

@@ -53,7 +53,9 @@ use crate::ptr::NonNull;
 ///
 /// [`to_raw_parts`]: *const::to_raw_parts
 #[lang = "pointee_trait"]
-#[rustc_deny_explicit_impl(implement_via_object = false)]
+#[cfg_attr(bootstrap, rustc_deny_explicit_impl(implement_via_object = false))]
+#[cfg_attr(not(bootstrap), rustc_deny_explicit_impl)]
+#[cfg_attr(not(bootstrap), rustc_do_not_implement_via_object)]
 pub trait Pointee {
     /// The type for metadata in pointers and references to `Self`.
     #[lang = "metadata_type"]

tests/ui/dyn-star/dyn-pointer-like.rs

@@ -0,0 +1,23 @@
+// Test that `dyn PointerLike` and `dyn* PointerLike` do not implement `PointerLike`.
+// This used to ICE during codegen.
+
+#![crate_type = "lib"]
+
+#![feature(pointer_like_trait, dyn_star)]
+#![feature(unsized_fn_params)]
+#![expect(incomplete_features)]
+#![expect(internal_features)]
+
+use std::marker::PointerLike;
+
+pub fn lol(x: dyn* PointerLike) {
+    foo(x); //~ ERROR `dyn* PointerLike` needs to have the same ABI as a pointer
+}
+
+pub fn uwu(x: dyn PointerLike) {
+    foo(x); //~ ERROR `dyn PointerLike` needs to have the same ABI as a pointer
+}
+
+fn foo<T: PointerLike + ?Sized>(x: T) {
+    let _: dyn* PointerLike = x;
+}

tests/ui/dyn-star/dyn-pointer-like.stderr

@@ -0,0 +1,39 @@
+error[E0277]: `dyn* PointerLike` needs to have the same ABI as a pointer
+  --> $DIR/dyn-pointer-like.rs:14:9
+   |
+LL |     foo(x);
+   |     --- ^ the trait `PointerLike` is not implemented for `dyn* PointerLike`
+   |     |
+   |     required by a bound introduced by this call
+   |
+   = note: the trait bound `dyn* PointerLike: PointerLike` is not satisfied
+note: required by a bound in `foo`
+  --> $DIR/dyn-pointer-like.rs:21:11
+   |
+LL | fn foo<T: PointerLike + ?Sized>(x: T) {
+   |           ^^^^^^^^^^^ required by this bound in `foo`
+help: consider borrowing here
+   |
+LL |     foo(&x);
+   |         +
+LL |     foo(&mut x);
+   |         ++++
+
+error[E0277]: `dyn PointerLike` needs to have the same ABI as a pointer
+  --> $DIR/dyn-pointer-like.rs:18:9
+   |
+LL |     foo(x);
+   |     --- ^ `dyn PointerLike` needs to be a pointer-like type
+   |     |
+   |     required by a bound introduced by this call
+   |
+   = help: the trait `PointerLike` is not implemented for `dyn PointerLike`
+note: required by a bound in `foo`
+  --> $DIR/dyn-pointer-like.rs:21:11
+   |
+LL | fn foo<T: PointerLike + ?Sized>(x: T) {
+   |           ^^^^^^^^^^^ required by this bound in `foo`
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0277`.

tests/ui/traits/deny-builtin-object-impl.current.stderr

@@ -1,20 +1,44 @@
-error[E0277]: the trait bound `dyn NotObject: NotObject` is not satisfied
+error[E0322]: explicit impls for the `NotImplYesObject` trait are not permitted
-  --> $DIR/deny-builtin-object-impl.rs:19:23
+  --> $DIR/deny-builtin-object-impl.rs:20:1
    |
-LL |     test_not_object::<dyn NotObject>();
+LL | impl NotImplYesObject for () {}
-   |                       ^^^^^^^^^^^^^ the trait `NotObject` is not implemented for `dyn NotObject`
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl of `NotImplYesObject` not allowed
+
+error[E0277]: the trait bound `dyn NotImplNotObject: NotImplNotObject` is not satisfied
+  --> $DIR/deny-builtin-object-impl.rs:37:32
+   |
+LL |     test_not_impl_not_object::<dyn NotImplNotObject>();
+   |                                ^^^^^^^^^^^^^^^^^^^^ the trait `NotImplNotObject` is not implemented for `dyn NotImplNotObject`
    |
 help: this trait has no implementations, consider adding one
-  --> $DIR/deny-builtin-object-impl.rs:11:1
+  --> $DIR/deny-builtin-object-impl.rs:12:1
    |
-LL | trait NotObject {}
+LL | trait NotImplNotObject {}
-   | ^^^^^^^^^^^^^^^
+   | ^^^^^^^^^^^^^^^^^^^^^^
-note: required by a bound in `test_not_object`
+note: required by a bound in `test_not_impl_not_object`
-  --> $DIR/deny-builtin-object-impl.rs:15:23
+  --> $DIR/deny-builtin-object-impl.rs:28:32
    |
-LL | fn test_not_object<T: NotObject + ?Sized>() {}
+LL | fn test_not_impl_not_object<T: NotImplNotObject + ?Sized>() {}
-   |                       ^^^^^^^^^ required by this bound in `test_not_object`
+   |                                ^^^^^^^^^^^^^^^^ required by this bound in `test_not_impl_not_object`
 
-error: aborting due to 1 previous error
+error[E0277]: the trait bound `dyn YesImplNotObject: YesImplNotObject` is not satisfied
+  --> $DIR/deny-builtin-object-impl.rs:40:32
+   |
+LL |     test_yes_impl_not_object::<dyn YesImplNotObject>();
+   |                                ^^^^^^^^^^^^^^^^^^^^ the trait `YesImplNotObject` is not implemented for `dyn YesImplNotObject`
+   |
+help: this trait has no implementations, consider adding one
+  --> $DIR/deny-builtin-object-impl.rs:15:1
+   |
+LL | trait YesImplNotObject {}
+   | ^^^^^^^^^^^^^^^^^^^^^^
+note: required by a bound in `test_yes_impl_not_object`
+  --> $DIR/deny-builtin-object-impl.rs:30:32
+   |
+LL | fn test_yes_impl_not_object<T: YesImplNotObject + ?Sized>() {}
+   |                                ^^^^^^^^^^^^^^^^ required by this bound in `test_yes_impl_not_object`
 
-For more information about this error, try `rustc --explain E0277`.
+error: aborting due to 3 previous errors
+
+Some errors have detailed explanations: E0277, E0322.
+For more information about an error, try `rustc --explain E0277`.

tests/ui/traits/deny-builtin-object-impl.next.stderr

@@ -1,20 +1,44 @@
-error[E0277]: the trait bound `dyn NotObject: NotObject` is not satisfied
+error[E0322]: explicit impls for the `NotImplYesObject` trait are not permitted
-  --> $DIR/deny-builtin-object-impl.rs:19:23
+  --> $DIR/deny-builtin-object-impl.rs:20:1
    |
-LL |     test_not_object::<dyn NotObject>();
+LL | impl NotImplYesObject for () {}
-   |                       ^^^^^^^^^^^^^ the trait `NotObject` is not implemented for `dyn NotObject`
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl of `NotImplYesObject` not allowed
+
+error[E0277]: the trait bound `dyn NotImplNotObject: NotImplNotObject` is not satisfied
+  --> $DIR/deny-builtin-object-impl.rs:37:32
+   |
+LL |     test_not_impl_not_object::<dyn NotImplNotObject>();
+   |                                ^^^^^^^^^^^^^^^^^^^^ the trait `NotImplNotObject` is not implemented for `dyn NotImplNotObject`
    |
 help: this trait has no implementations, consider adding one
-  --> $DIR/deny-builtin-object-impl.rs:11:1
+  --> $DIR/deny-builtin-object-impl.rs:12:1
    |
-LL | trait NotObject {}
+LL | trait NotImplNotObject {}
-   | ^^^^^^^^^^^^^^^
+   | ^^^^^^^^^^^^^^^^^^^^^^
-note: required by a bound in `test_not_object`
+note: required by a bound in `test_not_impl_not_object`
-  --> $DIR/deny-builtin-object-impl.rs:15:23
+  --> $DIR/deny-builtin-object-impl.rs:28:32
    |
-LL | fn test_not_object<T: NotObject + ?Sized>() {}
+LL | fn test_not_impl_not_object<T: NotImplNotObject + ?Sized>() {}
-   |                       ^^^^^^^^^ required by this bound in `test_not_object`
+   |                                ^^^^^^^^^^^^^^^^ required by this bound in `test_not_impl_not_object`
 
-error: aborting due to 1 previous error
+error[E0277]: the trait bound `dyn YesImplNotObject: YesImplNotObject` is not satisfied
+  --> $DIR/deny-builtin-object-impl.rs:40:32
+   |
+LL |     test_yes_impl_not_object::<dyn YesImplNotObject>();
+   |                                ^^^^^^^^^^^^^^^^^^^^ the trait `YesImplNotObject` is not implemented for `dyn YesImplNotObject`
+   |
+help: this trait has no implementations, consider adding one
+  --> $DIR/deny-builtin-object-impl.rs:15:1
+   |
+LL | trait YesImplNotObject {}
+   | ^^^^^^^^^^^^^^^^^^^^^^
+note: required by a bound in `test_yes_impl_not_object`
+  --> $DIR/deny-builtin-object-impl.rs:30:32
+   |
+LL | fn test_yes_impl_not_object<T: YesImplNotObject + ?Sized>() {}
+   |                                ^^^^^^^^^^^^^^^^ required by this bound in `test_yes_impl_not_object`
 
-For more information about this error, try `rustc --explain E0277`.
+error: aborting due to 3 previous errors
+
+Some errors have detailed explanations: E0277, E0322.
+For more information about an error, try `rustc --explain E0277`.

tests/ui/traits/deny-builtin-object-impl.rs

@@ -4,18 +4,41 @@
 
 #![feature(rustc_attrs)]
 
-#[rustc_deny_explicit_impl(implement_via_object = true)]
+#[rustc_deny_explicit_impl]
-trait YesObject {}
+trait NotImplYesObject {}
 
-#[rustc_deny_explicit_impl(implement_via_object = false)]
+#[rustc_deny_explicit_impl]
-trait NotObject {}
+#[rustc_do_not_implement_via_object]
+trait NotImplNotObject {}
 
-fn test_yes_object<T: YesObject + ?Sized>() {}
+#[rustc_do_not_implement_via_object]
+trait YesImplNotObject {}
 
-fn test_not_object<T: NotObject + ?Sized>() {}
+#[rustc_do_not_implement_via_object]
+trait YesImplNotObject2 {}
+
+impl NotImplYesObject for () {}
+//~^ ERROR explicit impls for the `NotImplYesObject` trait are not permitted
+
+// If there is no automatic impl then we can add a manual impl:
+impl YesImplNotObject2 for dyn YesImplNotObject2 {}
+
+fn test_not_impl_yes_object<T: NotImplYesObject + ?Sized>() {}
+
+fn test_not_impl_not_object<T: NotImplNotObject + ?Sized>() {}
+
+fn test_yes_impl_not_object<T: YesImplNotObject + ?Sized>() {}
+
+fn test_yes_impl_not_object2<T: YesImplNotObject2 + ?Sized>() {}
 
 fn main() {
-    test_yes_object::<dyn YesObject>();
+    test_not_impl_yes_object::<dyn NotImplYesObject>();
-    test_not_object::<dyn NotObject>();
+
-    //~^ ERROR the trait bound `dyn NotObject: NotObject` is not satisfied
+    test_not_impl_not_object::<dyn NotImplNotObject>();
+    //~^ ERROR the trait bound `dyn NotImplNotObject: NotImplNotObject` is not satisfied
+
+    test_yes_impl_not_object::<dyn YesImplNotObject>();
+    //~^ ERROR the trait bound `dyn YesImplNotObject: YesImplNotObject` is not satisfied
+
+    test_yes_impl_not_object2::<dyn YesImplNotObject2>();
 }