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Tweak "object unsafe" errors

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Fix #77598.
This commit is contained in:
Esteban Küber 2020-10-15 17:23:45 -07:00
parent 9832374f6e
commit ae0e3d0511
57 changed files with 720 additions and 442 deletions
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37
compiler/rustc_infer/src/traits/error_reporting/mod.rs
View File

@ -2,12 +2,12 @@ use super::ObjectSafetyViolation;
use crate::infer::InferCtxt;
use rustc_data_structures::fx::FxHashSet;
use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder};
use rustc_errors::{struct_span_err, DiagnosticBuilder};
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_middle::ty::TyCtxt;
use rustc_span::symbol::Symbol;
use rustc_span::Span;
use rustc_span::{MultiSpan, Span};
use std::fmt;
impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
@ -57,7 +57,8 @@ pub fn report_object_safety_error(
err.span_label(span, format!("the trait `{}` cannot be made into an object", trait_str));
let mut reported_violations = FxHashSet::default();
let mut had_span_label = false;
let mut multi_span = vec![];
let mut messages = vec![];
for violation in violations {
if let ObjectSafetyViolation::SizedSelf(sp) = &violation {
if !sp.is_empty() {
@ -71,31 +72,37 @@ pub fn report_object_safety_error(
let msg = if trait_span.is_none() || spans.is_empty() {
format!("the trait cannot be made into an object because {}", violation.error_msg())
} else {
had_span_label = true;
format!("...because {}", violation.error_msg())
};
if spans.is_empty() {
err.note(&msg);
} else {
for span in spans {
err.span_label(span, &msg);
multi_span.push(span);
messages.push(msg.clone());
}
}
match (trait_span, violation.solution()) {
(Some(_), Some((note, None))) => {
err.help(&note);
}
(Some(_), Some((note, Some((sugg, span))))) => {
err.span_suggestion(span, &note, sugg, Applicability::MachineApplicable);
}
if trait_span.is_some() {
// Only provide the help if its a local trait, otherwise it's not actionable.
_ => {}
violation.solution(&mut err);
}
}
}
if let (Some(trait_span), true) = (trait_span, had_span_label) {
err.span_label(trait_span, "this trait cannot be made into an object...");
let has_multi_span = !multi_span.is_empty();
let mut note_span = MultiSpan::from_spans(multi_span.clone());
if let (Some(trait_span), true) = (trait_span, has_multi_span) {
note_span
.push_span_label(trait_span, "this trait cannot be made into an object...".to_string());
}
for (span, msg) in multi_span.into_iter().zip(messages.into_iter()) {
note_span.push_span_label(span, msg);
}
err.span_note(
note_span,
"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>",
);
if tcx.sess.trait_methods_not_found.borrow().contains(&span) {
// Avoid emitting error caused by non-existing method (#58734)

74
compiler/rustc_middle/src/traits/mod.rs
View File

@ -13,6 +13,7 @@ use crate::mir::interpret::ErrorHandled;
use crate::ty::subst::SubstsRef;
use crate::ty::{self, AdtKind, Ty, TyCtxt};
use rustc_errors::{Applicability, DiagnosticBuilder};
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_span::symbol::Symbol;
@ -652,7 +653,7 @@ impl ObjectSafetyViolation {
.into()
}
}
ObjectSafetyViolation::Method(name, MethodViolationCode::StaticMethod(_), _) => {
ObjectSafetyViolation::Method(name, MethodViolationCode::StaticMethod(_, _, _), _) => {
format!("associated function `{}` has no `self` parameter", name).into()
}
ObjectSafetyViolation::Method(
@ -686,32 +687,65 @@ impl ObjectSafetyViolation {
}
}
pub fn solution(&self) -> Option<(String, Option<(String, Span)>)> {
Some(match *self {
ObjectSafetyViolation::SizedSelf(_) | ObjectSafetyViolation::SupertraitSelf(_) => {
return None;
pub fn solution(&self, err: &mut DiagnosticBuilder<'_>) {
match *self {
ObjectSafetyViolation::SizedSelf(_) | ObjectSafetyViolation::SupertraitSelf(_) => {}
ObjectSafetyViolation::Method(
name,
MethodViolationCode::StaticMethod(sugg, self_span, has_args),
_,
) => {
err.span_suggestion(
self_span,
&format!(
"consider turning `{}` into a method by giving it a `&self` argument",
name
),
format!("&self{}", if has_args { ", " } else { "" }),
Applicability::MaybeIncorrect,
);
match sugg {
Some((sugg, span)) => {
err.span_suggestion(
span,
&format!(
"alternatively, consider constraining `{}` so it does not apply to \
trait objects",
name
),
sugg.to_string(),
Applicability::MaybeIncorrect,
);
}
None => {
err.help(&format!(
"consider turning `{}` into a method by giving it a `&self` \
argument or constraining it so it does not apply to trait objects",
name
));
}
}
}
ObjectSafetyViolation::Method(name, MethodViolationCode::StaticMethod(sugg), _) => (
format!(
"consider turning `{}` into a method by giving it a `&self` argument or \
constraining it so it does not apply to trait objects",
name
),
sugg.map(|(sugg, sp)| (sugg.to_string(), sp)),
),
ObjectSafetyViolation::Method(
name,
MethodViolationCode::UndispatchableReceiver,
span,
) => (
format!("consider changing method `{}`'s `self` parameter to be `&self`", name),
Some(("&Self".to_string(), span)),
),
) => {
err.span_suggestion(
span,
&format!(
"consider changing method `{}`'s `self` parameter to be `&self`",
name
),
"&Self".to_string(),
Applicability::MachineApplicable,
);
}
ObjectSafetyViolation::AssocConst(name, _)
| ObjectSafetyViolation::Method(name, ..) => {
(format!("consider moving `{}` to another trait", name), None)
err.help(&format!("consider moving `{}` to another trait", name));
}
})
}
}
pub fn spans(&self) -> SmallVec<[Span; 1]> {
@ -735,7 +769,7 @@ impl ObjectSafetyViolation {
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, HashStable)]
pub enum MethodViolationCode {
/// e.g., `fn foo()`
StaticMethod(Option<(&'static str, Span)>),
StaticMethod(Option<(&'static str, Span)>, Span, bool /* has args */),
/// e.g., `fn foo(&self, x: Self)`
ReferencesSelfInput(usize),

70
compiler/rustc_trait_selection/src/traits/object_safety.rs
View File

@ -13,7 +13,7 @@ use super::elaborate_predicates;
use crate::infer::TyCtxtInferExt;
use crate::traits::query::evaluate_obligation::InferCtxtExt;
use crate::traits::{self, Obligation, ObligationCause};
use rustc_errors::{Applicability, FatalError};
use rustc_errors::FatalError;
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_middle::ty::subst::{GenericArg, InternalSubsts, Subst};
@ -21,7 +21,7 @@ use rustc_middle::ty::{self, Ty, TyCtxt, TypeFoldable, TypeVisitor, WithConstnes
use rustc_middle::ty::{Predicate, ToPredicate};
use rustc_session::lint::builtin::WHERE_CLAUSES_OBJECT_SAFETY;
use rustc_span::symbol::Symbol;
use rustc_span::Span;
use rustc_span::{MultiSpan, Span};
use smallvec::SmallVec;
use std::array;
@ -112,33 +112,35 @@ fn object_safety_violations_for_trait(
tcx.def_path_str(trait_def_id)
));
let node = tcx.hir().get_if_local(trait_def_id);
let msg = if let Some(hir::Node::Item(item)) = node {
err.span_label(
let mut spans = MultiSpan::from_span(*span);
if let Some(hir::Node::Item(item)) = node {
spans.push_span_label(
item.ident.span,
"this trait cannot be made into an object...",
"this trait cannot be made into an object...".into(),
);
spans.push_span_label(
*span,
format!("...because {}", violation.error_msg()),
);
format!("...because {}", violation.error_msg())
} else {
format!(
"the trait cannot be made into an object because {}",
violation.error_msg()
)
spans.push_span_label(
*span,
format!(
"the trait cannot be made into an object because {}",
violation.error_msg()
),
);
};
err.span_label(*span, &msg);
match (node, violation.solution()) {
(Some(_), Some((note, None))) => {
err.help(&note);
}
(Some(_), Some((note, Some((sugg, span))))) => {
err.span_suggestion(
span,
&note,
sugg,
Applicability::MachineApplicable,
);
}
// Only provide the help if its a local trait, otherwise it's not actionable.
_ => {}
err.span_note(
spans,
"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>",
);
if node.is_some() {
// Only provide the help if its a local trait, otherwise it's not
violation.solution(&mut err);
}
err.emit();
},
@ -385,6 +387,8 @@ fn virtual_call_violation_for_method<'tcx>(
trait_def_id: DefId,
method: &ty::AssocItem,
) -> Option<MethodViolationCode> {
let sig = tcx.fn_sig(method.def_id);
// The method's first parameter must be named `self`
if !method.fn_has_self_parameter {
// We'll attempt to provide a structured suggestion for `Self: Sized`.
@ -395,11 +399,21 @@ fn virtual_call_violation_for_method<'tcx>(
[.., pred] => (", Self: Sized", pred.span().shrink_to_hi()),
},
);
return Some(MethodViolationCode::StaticMethod(sugg));
// Get the span pointing at where the `self` receiver should be.
let sm = tcx.sess.source_map();
let self_span = method.ident.span.to(tcx
.hir()
.span_if_local(method.def_id)
.unwrap_or_else(|| sm.next_point(method.ident.span))
.shrink_to_hi());
let self_span = sm.span_through_char(self_span, '(').shrink_to_hi();
return Some(MethodViolationCode::StaticMethod(
sugg,
self_span,
!sig.inputs().skip_binder().is_empty(),
));
}
let sig = tcx.fn_sig(method.def_id);
for (i, input_ty) in sig.skip_binder().inputs()[1..].iter().enumerate() {
if contains_illegal_self_type_reference(tcx, trait_def_id, input_ty) {
return Some(MethodViolationCode::ReferencesSelfInput(i));

12
src/test/ui/associated-consts/associated-const-in-trait.stderr
View File

@ -1,15 +1,17 @@
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/associated-const-in-trait.rs:9:6
|
LL | trait Trait {
| ----- this trait cannot be made into an object...
LL | const N: usize;
| - ...because it contains this associated `const`
...
LL | impl dyn Trait {
| ^^^^^^^^^ the trait `Trait` cannot be made into an object
|
= help: consider moving `N` to another trait
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/associated-const-in-trait.rs:6:11
|
LL | trait Trait {
| ----- this trait cannot be made into an object...
LL | const N: usize;
| ^ ...because it contains this associated `const`
error: aborting due to previous error

12
src/test/ui/associated-item/issue-48027.stderr
View File

@ -1,15 +1,17 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/issue-48027.rs:6:6
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | const X: usize;
| - ...because it contains this associated `const`
...
LL | impl dyn Bar {}
| ^^^^^^^ the trait `Bar` cannot be made into an object
|
= help: consider moving `X` to another trait
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/issue-48027.rs:2:11
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | const X: usize;
| ^ ...because it contains this associated `const`
error[E0283]: type annotations needed
--> $DIR/issue-48027.rs:3:32

11
src/test/ui/coherence/coherence-impl-trait-for-trait-object-safe.stderr
View File

@ -1,14 +1,17 @@
error[E0038]: the trait `NotObjectSafe` cannot be made into an object
--> $DIR/coherence-impl-trait-for-trait-object-safe.rs:7:24
|
LL | trait NotObjectSafe { fn eq(&self, other: Self); }
| ------------- ---- ...because method `eq` references the `Self` type in this parameter
| |
| this trait cannot be made into an object...
LL | impl NotObjectSafe for dyn NotObjectSafe { }
| ^^^^^^^^^^^^^^^^^ the trait `NotObjectSafe` cannot be made into an object
|
= help: consider moving `eq` to another trait
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/coherence-impl-trait-for-trait-object-safe.rs:6:43
|
LL | trait NotObjectSafe { fn eq(&self, other: Self); }
| ------------- ^^^^ ...because method `eq` references the `Self` type in this parameter
| |
| this trait cannot be made into an object...
error: aborting due to previous error

1
src/test/ui/did_you_mean/trait-object-reference-without-parens-suggestion.stderr
View File

@ -17,6 +17,7 @@ LL | let _: &Copy + 'static;
| ^^^^^ the trait `Copy` cannot be made into an object
|
= note: the trait cannot be made into an object because it requires `Self: Sized`
= 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>
error: aborting due to 3 previous errors

18
src/test/ui/error-codes/E0033-teach.stderr
View File

@ -7,15 +7,21 @@ LL | let trait_obj: &dyn SomeTrait = SomeTrait;
error[E0038]: the trait `SomeTrait` cannot be made into an object
--> $DIR/E0033-teach.rs:8:20
|
LL | trait SomeTrait {
| --------- this trait cannot be made into an object...
LL | fn foo();
| --- ...because associated function `foo` has no `self` parameter
...
LL | let trait_obj: &dyn SomeTrait = SomeTrait;
| ^^^^^^^^^^^^^^ the trait `SomeTrait` cannot be made into an object
|
help: consider turning `foo` into a method by giving it a `&self` argument or constraining it so it does not apply to trait objects
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/E0033-teach.rs:4:8
|
LL | trait SomeTrait {
| --------- this trait cannot be made into an object...
LL | fn foo();
| ^^^ ...because associated function `foo` has no `self` parameter
help: consider turning `foo` into a method by giving it a `&self` argument
|
LL | fn foo(&self);
| ^^^^^
help: alternatively, consider constraining `foo` so it does not apply to trait objects
|
LL | fn foo() where Self: Sized;
| ^^^^^^^^^^^^^^^^^

18
src/test/ui/error-codes/E0033.stderr
View File

@ -7,15 +7,21 @@ LL | let trait_obj: &dyn SomeTrait = SomeTrait;
error[E0038]: the trait `SomeTrait` cannot be made into an object
--> $DIR/E0033.rs:6:20
|
LL | trait SomeTrait {
| --------- this trait cannot be made into an object...
LL | fn foo();
| --- ...because associated function `foo` has no `self` parameter
...
LL | let trait_obj: &dyn SomeTrait = SomeTrait;
| ^^^^^^^^^^^^^^ the trait `SomeTrait` cannot be made into an object
|
help: consider turning `foo` into a method by giving it a `&self` argument or constraining it so it does not apply to trait objects
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/E0033.rs:2:8
|
LL | trait SomeTrait {
| --------- this trait cannot be made into an object...
LL | fn foo();
| ^^^ ...because associated function `foo` has no `self` parameter
help: consider turning `foo` into a method by giving it a `&self` argument
|
LL | fn foo(&self);
| ^^^^^
help: alternatively, consider constraining `foo` so it does not apply to trait objects
|
LL | fn foo() where Self: Sized;
| ^^^^^^^^^^^^^^^^^

12
src/test/ui/error-codes/E0038.stderr
View File

@ -1,15 +1,17 @@
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/E0038.rs:5:16
|
LL | trait Trait {
| ----- this trait cannot be made into an object...
LL | fn foo(&self) -> Self;
| ---- ...because method `foo` references the `Self` type in its return type
...
LL | fn call_foo(x: Box<dyn Trait>) {
| ^^^^^^^^^^^^^^ the trait `Trait` cannot be made into an object
|
= help: consider moving `foo` to another trait
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/E0038.rs:2:22
|
LL | trait Trait {
| ----- this trait cannot be made into an object...
LL | fn foo(&self) -> Self;
| ^^^^ ...because method `foo` references the `Self` type in its return type
error: aborting due to previous error

68
src/test/ui/feature-gates/feature-gate-object_safe_for_dispatch.stderr
View File

@ -1,26 +1,35 @@
error[E0038]: the trait `NonObjectSafe1` cannot be made into an object
--> $DIR/feature-gate-object_safe_for_dispatch.rs:18:38
|
LL | trait NonObjectSafe1: Sized {}
| -------------- ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | fn takes_non_object_safe_ref<T>(obj: &dyn NonObjectSafe1) {
| ^^^^^^^^^^^^^^^^^^^ the trait `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 | trait NonObjectSafe2 {
| -------------- this trait cannot be made into an object...
LL | fn static_fn() {}
| --------- ...because associated function `static_fn` has no `self` parameter
...
LL | fn return_non_object_safe_ref() -> &'static dyn NonObjectSafe2 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `NonObjectSafe2` cannot be made into an object
|
help: consider turning `static_fn` into a method by giving it a `&self` argument or constraining it so it does not apply to trait objects
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 {}
| ^^^^^^^^^^^^^^^^^
@ -28,39 +37,46 @@ 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:27:35
|
LL | trait NonObjectSafe3 {
| -------------- this trait cannot be made into an object...
LL | fn foo<T>(&self);
| --- ...because method `foo` has generic type parameters
...
LL | fn takes_non_object_safe_box(obj: Box<dyn NonObjectSafe3>) {
| ^^^^^^^^^^^^^^^^^^^^^^^ the trait `NonObjectSafe3` cannot be made into an object
|
= help: consider moving `foo` to another trait
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
error[E0038]: the trait `NonObjectSafe4` cannot be made into an object
--> $DIR/feature-gate-object_safe_for_dispatch.rs:31:35
|
LL | trait NonObjectSafe4 {
| -------------- this trait cannot be made into an object...
LL | fn foo(&self, &Self);
| ----- ...because method `foo` references the `Self` type in this parameter
...
LL | fn return_non_object_safe_rc() -> std::rc::Rc<dyn NonObjectSafe4> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `NonObjectSafe4` cannot be made into an object
|
= help: consider moving `foo` to another trait
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:15:19
|
LL | trait NonObjectSafe4 {
| -------------- this trait cannot be made into an object...
LL | fn foo(&self, &Self);
| ^^^^^ ...because method `foo` references the `Self` type in this parameter
error[E0038]: the trait `NonObjectSafe1` cannot be made into an object
--> $DIR/feature-gate-object_safe_for_dispatch.rs:38:16
|
LL | trait NonObjectSafe1: Sized {}
| -------------- ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | impl Trait for dyn NonObjectSafe1 {}
| ^^^^^^^^^^^^^^^^^^ the trait `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

34
src/test/ui/impl-trait/object-unsafe-trait-in-return-position-dyn-trait.stderr
View File

@ -1,15 +1,21 @@
error[E0038]: the trait `NotObjectSafe` cannot be made into an object
--> $DIR/object-unsafe-trait-in-return-position-dyn-trait.rs:21:13
|
LL | fn car() -> dyn NotObjectSafe {
| ^^^^^^^^^^^^^^^^^ the trait `NotObjectSafe` 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/object-unsafe-trait-in-return-position-dyn-trait.rs:3:8
|
LL | trait NotObjectSafe {
| ------------- this trait cannot be made into an object...
LL | fn foo() -> Self;
| --- ...because associated function `foo` has no `self` parameter
...
LL | fn car() -> dyn NotObjectSafe {
| ^^^^^^^^^^^^^^^^^ the trait `NotObjectSafe` cannot be made into an object
| ^^^ ...because associated function `foo` has no `self` parameter
help: consider turning `foo` into a method by giving it a `&self` argument
|
help: consider turning `foo` into a method by giving it a `&self` argument or constraining it so it does not apply to trait objects
LL | fn foo(&self) -> Self;
| ^^^^^
help: alternatively, consider constraining `foo` so it does not apply to trait objects
|
LL | fn foo() -> Self where Self: Sized;
| ^^^^^^^^^^^^^^^^^
@ -17,15 +23,21 @@ LL | fn foo() -> Self where Self: Sized;
error[E0038]: the trait `NotObjectSafe` cannot be made into an object
--> $DIR/object-unsafe-trait-in-return-position-dyn-trait.rs:28:13
|
LL | trait NotObjectSafe {
| ------------- this trait cannot be made into an object...
LL | fn foo() -> Self;
| --- ...because associated function `foo` has no `self` parameter
...
LL | fn cat() -> Box<dyn NotObjectSafe> {
| ^^^^^^^^^^^^^^^^^^^^^^ the trait `NotObjectSafe` cannot be made into an object
|
help: consider turning `foo` into a method by giving it a `&self` argument or constraining it so it does not apply to trait objects
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/object-unsafe-trait-in-return-position-dyn-trait.rs:3:8
|
LL | trait NotObjectSafe {
| ------------- this trait cannot be made into an object...
LL | fn foo() -> Self;
| ^^^ ...because associated function `foo` has no `self` parameter
help: consider turning `foo` into a method by giving it a `&self` argument
|
LL | fn foo(&self) -> Self;
| ^^^^^
help: alternatively, consider constraining `foo` so it does not apply to trait objects
|
LL | fn foo() -> Self where Self: Sized;
| ^^^^^^^^^^^^^^^^^

12
src/test/ui/issues/issue-18959.stderr
View File

@ -1,15 +1,17 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/issue-18959.rs:11:11
|
LL | pub trait Foo { fn foo<T>(&self, ext_thing: &T); }
| --- ...because method `foo` has generic type parameters
LL | pub trait Bar: Foo { }
| --- this trait cannot be made into an object...
...
LL | fn foo(b: &dyn Bar) {
| ^^^^^^^^ the trait `Bar` cannot be made into an object
|
= help: consider moving `foo` to another trait
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/issue-18959.rs:1:20
|
LL | pub trait Foo { fn foo<T>(&self, ext_thing: &T); }
| ^^^ ...because method `foo` has generic type parameters
LL | pub trait Bar: Foo { }
| --- this trait cannot be made into an object...
error: aborting due to previous error

16
src/test/ui/issues/issue-19380.stderr
View File

@ -1,15 +1,21 @@
error[E0038]: the trait `Qiz` cannot be made into an object
--> $DIR/issue-19380.rs:11:9
|
LL | foos: &'static [&'static (dyn Qiz + 'static)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Qiz` 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/issue-19380.rs:2:6
|
LL | trait Qiz {
| --- this trait cannot be made into an object...
LL | fn qiz();
| --- ...because associated function `qiz` has no `self` parameter
...
LL | foos: &'static [&'static (dyn Qiz + 'static)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Qiz` cannot be made into an object
| ^^^ ...because associated function `qiz` has no `self` parameter
help: consider turning `qiz` into a method by giving it a `&self` argument
|
help: consider turning `qiz` into a method by giving it a `&self` argument or constraining it so it does not apply to trait objects
LL | fn qiz(&self);
| ^^^^^
help: alternatively, consider constraining `qiz` so it does not apply to trait objects
|
LL | fn qiz() where Self: Sized;
| ^^^^^^^^^^^^^^^^^

28
src/test/ui/issues/issue-19538.stderr
View File

@ -1,30 +1,34 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/issue-19538.rs:17:15
|
LL | fn foo<T>(&self, val: T);
| --- ...because method `foo` has generic type parameters
...
LL | trait Bar: Foo { }
| --- this trait cannot be made into an object...
...
LL | let test: &mut dyn Bar = &mut thing;
| ^^^^^^^^^^^^ the trait `Bar` cannot be made into an object
|
= help: consider moving `foo` to another trait
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/issue-19538.rs:2:8
|
LL | fn foo<T>(&self, val: T);
| ^^^ ...because method `foo` has generic type parameters
...
LL | trait Bar: Foo { }
| --- this trait cannot be made into an object...
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/issue-19538.rs:17:30
|
LL | fn foo<T>(&self, val: T);
| --- ...because method `foo` has generic type parameters
...
LL | trait Bar: Foo { }
| --- this trait cannot be made into an object...
...
LL | let test: &mut dyn Bar = &mut thing;
| ^^^^^^^^^^ the trait `Bar` cannot be made into an object
|
= help: consider moving `foo` to another trait
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/issue-19538.rs:2:8
|
LL | fn foo<T>(&self, val: T);
| ^^^ ...because method `foo` has generic type parameters
...
LL | trait Bar: Foo { }
| --- this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<&mut dyn Bar>` for `&mut Thing`
= note: required by cast to type `&mut dyn Bar`

25
src/test/ui/issues/issue-20692.stderr
View File

@ -1,27 +1,32 @@
error[E0038]: the trait `Array` cannot be made into an object
--> $DIR/issue-20692.rs:7:5
|
LL | &dyn Array;
| ^^^^^^^^^^ the trait `Array` 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/issue-20692.rs:1:14
|
LL | trait Array: Sized + Copy {}
| ----- ----- ---- ...because it requires `Self: Sized`
| ----- ^^^^^ ^^^^ ...because it requires `Self: Sized`
| | |
| | ...because it requires `Self: Sized`
| this trait cannot be made into an object...
...
LL | &dyn Array;
| ^^^^^^^^^^ the trait `Array` cannot be made into an object
error[E0038]: the trait `Array` cannot be made into an object
--> $DIR/issue-20692.rs:4:13
|
LL | trait Array: Sized + Copy {}
| ----- ----- ---- ...because it requires `Self: Sized`
| | |
| | ...because it requires `Self: Sized`
| this trait cannot be made into an object...
...
LL | let _ = x
| ^ the trait `Array` 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/issue-20692.rs:1:14
|
LL | trait Array: Sized + Copy {}
| ----- ^^^^^ ^^^^ ...because it requires `Self: Sized`
| | |
| | ...because it requires `Self: Sized`
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Array>` for `&T`
= note: required by cast to type `&dyn Array`

13
src/test/ui/issues/issue-26056.stderr
View File

@ -1,13 +1,16 @@
error[E0038]: the trait `Map` cannot be made into an object
--> $DIR/issue-26056.rs:20:13
|
LL | trait Map: MapLookup<<Self as Map>::Key> {
| --- ----------------------------- ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
...
LL | as &dyn Map<Key=u32,MapValue=u32>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Map` 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/issue-26056.rs:9:12
|
LL | trait Map: MapLookup<<Self as Map>::Key> {
| --- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
error: aborting due to previous error

17
src/test/ui/issues/issue-28576.stderr
View File

@ -1,16 +1,19 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/issue-28576.rs:7:12
|
LL | pub trait Bar: Foo<Assoc=()> {
| --- -------------
| | | |
| | | ...because it uses `Self` as a type parameter in this
| | ...because it uses `Self` as a type parameter in this
| this trait cannot be made into an object...
LL | fn new(&self, b: &
LL | / dyn Bar
LL | | <Assoc=()>
| |________________________^ the trait `Bar` 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/issue-28576.rs:5:16
|
LL | pub trait Bar: Foo<Assoc=()> {
| --- ^^^^^^^^^^^^^
| | | |
| | | ...because it uses `Self` as a type parameter in this
| | ...because it uses `Self` as a type parameter in this
| this trait cannot be made into an object...
error: aborting due to previous error

12
src/test/ui/issues/issue-38404.stderr
View File

@ -1,12 +1,16 @@
error[E0038]: the trait `B` cannot be made into an object
--> $DIR/issue-38404.rs:3:15
|
LL | trait A<T>: std::ops::Add<Self> + Sized {}
| ------------------- ...because it uses `Self` as a type parameter in this
LL | trait B<T>: A<T> {}
| - this trait cannot be made into an object...
LL | trait C<T>: A<dyn B<T, Output=usize>> {}
| ^^^^^^^^^^^^^^^^^^^^^^ the trait `B` 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/issue-38404.rs:1:13
|
LL | trait A<T>: std::ops::Add<Self> + Sized {}
| ^^^^^^^^^^^^^^^^^^^ ...because it uses `Self` as a type parameter in this
LL | trait B<T>: A<T> {}
| - this trait cannot be made into an object...
error: aborting due to previous error

25
src/test/ui/issues/issue-38604.stderr
View File

@ -1,25 +1,30 @@
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/issue-38604.rs:14:13
|
LL | trait Foo where u32: Q<Self> {
| --- ------- ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
...
LL | let _f: Box<dyn Foo> =
| ^^^^^^^^^^^^ the trait `Foo` 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/issue-38604.rs:2:22
|
LL | trait Foo where u32: Q<Self> {
| --- ^^^^^^^ ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/issue-38604.rs:15:9
|
LL | trait Foo where u32: Q<Self> {
| --- ------- ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
...
LL | Box::new(());
| ^^^^^^^^^^^^ the trait `Foo` 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/issue-38604.rs:2:22
|
LL | trait Foo where u32: Q<Self> {
| --- ^^^^^^^ ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<Box<dyn Foo>>` for `Box<()>`
= note: required by cast to type `Box<dyn Foo>`

11
src/test/ui/issues/issue-50781.stderr
View File

@ -1,10 +1,8 @@
error: the trait `X` cannot be made into an object
--> $DIR/issue-50781.rs:6:8
|
LL | trait X {
| - this trait cannot be made into an object...
LL | fn foo(&self) where Self: Trait;
| ^^^ ...because method `foo` references the `Self` type in its `where` clause
| ^^^
|
note: the lint level is defined here
--> $DIR/issue-50781.rs:1:9
@ -13,6 +11,13 @@ LL | #![deny(where_clauses_object_safety)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #51443 <https://github.com/rust-lang/rust/issues/51443>
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/issue-50781.rs:6:8
|
LL | trait X {
| - this trait cannot be made into an object...
LL | fn foo(&self) where Self: Trait;
| ^^^ ...because method `foo` references the `Self` type in its `where` clause
= help: consider moving `foo` to another trait
error: aborting due to previous error

25
src/test/ui/kindck/kindck-inherited-copy-bound.curr.stderr
View File

@ -12,25 +12,30 @@ LL | take_param(&x);
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/kindck-inherited-copy-bound.rs:28:19
|
LL | trait Foo : Copy {
| --- ---- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | let z = &x as &dyn Foo;
| ^^^^^^^^ the trait `Foo` 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/kindck-inherited-copy-bound.rs:10:13
|
LL | trait Foo : Copy {
| --- ^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/kindck-inherited-copy-bound.rs:28:13
|
LL | trait Foo : Copy {
| --- ---- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | let z = &x as &dyn Foo;
| ^^ the trait `Foo` 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/kindck-inherited-copy-bound.rs:10:13
|
LL | trait Foo : Copy {
| --- ^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Foo>` for `&Box<{integer}>`
= note: required by cast to type `&dyn Foo`

12
src/test/ui/kindck/kindck-inherited-copy-bound.object_safe_for_dispatch.stderr
View File

@ -12,14 +12,16 @@ LL | take_param(&x);
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/kindck-inherited-copy-bound.rs:28:13
|
LL | trait Foo : Copy {
| --- ---- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | let z = &x as &dyn Foo;
| ^^ the trait `Foo` 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/kindck-inherited-copy-bound.rs:10:13
|
LL | trait Foo : Copy {
| --- ^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Foo>` for `&Box<i32>`
= note: required by cast to type `&dyn Foo`

12
src/test/ui/object-safety/object-safety-associated-consts.curr.stderr
View File

@ -1,15 +1,17 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/object-safety-associated-consts.rs:12:30
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | const X: usize;
| - ...because it contains this associated `const`
...
LL | fn make_bar<T:Bar>(t: &T) -> &dyn Bar {
| ^^^^^^^^ the trait `Bar` cannot be made into an object
|
= help: consider moving `X` to another trait
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/object-safety-associated-consts.rs:9:11
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | const X: usize;
| ^ ...because it contains this associated `const`
error: aborting due to previous error

12
src/test/ui/object-safety/object-safety-associated-consts.object_safe_for_dispatch.stderr
View File

@ -1,15 +1,17 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/object-safety-associated-consts.rs:14:5
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | const X: usize;
| - ...because it contains this associated `const`
...
LL | t
| ^ the trait `Bar` cannot be made into an object
|
= help: consider moving `X` to another trait
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/object-safety-associated-consts.rs:9:11
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | const X: usize;
| ^ ...because it contains this associated `const`
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Bar>` for `&T`
= note: required by cast to type `&dyn Bar`

11
src/test/ui/object-safety/object-safety-bounds.stderr
View File

@ -1,13 +1,16 @@
error[E0038]: the trait `X` cannot be made into an object
--> $DIR/object-safety-bounds.rs:7:11
|
LL | fn f() -> Box<dyn X<U = u32>> {
| ^^^^^^^^^^^^^^^^^^^ the trait `X` 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/object-safety-bounds.rs:4:13
|
LL | trait X {
| - this trait cannot be made into an object...
LL | type U: PartialEq<Self>;
| --------------- ...because it uses `Self` as a type parameter in this
...
LL | fn f() -> Box<dyn X<U = u32>> {
| ^^^^^^^^^^^^^^^^^^^ the trait `X` cannot be made into an object
| ^^^^^^^^^^^^^^^ ...because it uses `Self` as a type parameter in this
error: aborting due to previous error

24
src/test/ui/object-safety/object-safety-generics.curr.stderr
View File

@ -1,28 +1,32 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/object-safety-generics.rs:18:30
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | fn bar<T>(&self, t: T);
| --- ...because method `bar` has generic type parameters
...
LL | fn make_bar<T:Bar>(t: &T) -> &dyn Bar {
| ^^^^^^^^ the trait `Bar` cannot be made into an object
|
= help: consider moving `bar` to another trait
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/object-safety-generics.rs:24:39
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/object-safety-generics.rs:10:8
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | fn bar<T>(&self, t: T);
| --- ...because method `bar` has generic type parameters
...
| ^^^ ...because method `bar` has generic type parameters
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/object-safety-generics.rs:24:39
|
LL | fn make_bar_explicit<T:Bar>(t: &T) -> &dyn Bar {
| ^^^^^^^^ the trait `Bar` cannot be made into an object
|
= help: consider moving `bar` to another trait
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/object-safety-generics.rs:10:8
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | fn bar<T>(&self, t: T);
| ^^^ ...because method `bar` has generic type parameters
error: aborting due to 2 previous errors

24
src/test/ui/object-safety/object-safety-generics.object_safe_for_dispatch.stderr
View File

@ -1,30 +1,34 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/object-safety-generics.rs:20:5
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | fn bar<T>(&self, t: T);
| --- ...because method `bar` has generic type parameters
...
LL | t
| ^ the trait `Bar` cannot be made into an object
|
= help: consider moving `bar` to another trait
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/object-safety-generics.rs:10:8
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | fn bar<T>(&self, t: T);
| ^^^ ...because method `bar` has generic type parameters
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Bar>` for `&T`
= note: required by cast to type `&dyn Bar`
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/object-safety-generics.rs:26:5
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | fn bar<T>(&self, t: T);
| --- ...because method `bar` has generic type parameters
...
LL | t as &dyn Bar
| ^ the trait `Bar` cannot be made into an object
|
= help: consider moving `bar` to another trait
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/object-safety-generics.rs:10:8
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | fn bar<T>(&self, t: T);
| ^^^ ...because method `bar` has generic type parameters
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Bar>` for `&T`
= note: required by cast to type `&dyn Bar`

13
src/test/ui/object-safety/object-safety-issue-22040.stderr
View File

@ -1,13 +1,16 @@
error[E0038]: the trait `Expr` cannot be made into an object
--> $DIR/object-safety-issue-22040.rs:12:23
|
LL | trait Expr: Debug + PartialEq {
| ---- --------- ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
...
LL | elements: Vec<Box<dyn Expr + 'x>>,
| ^^^^^^^^^^^^^ the trait `Expr` 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/object-safety-issue-22040.rs:5:21
|
LL | trait Expr: Debug + PartialEq {
| ---- ^^^^^^^^^ ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
error: aborting due to previous error

24
src/test/ui/object-safety/object-safety-mentions-Self.curr.stderr
View File

@ -1,28 +1,32 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/object-safety-mentions-Self.rs:22:30
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | fn bar(&self, x: &Self);
| ----- ...because method `bar` references the `Self` type in this parameter
...
LL | fn make_bar<T:Bar>(t: &T) -> &dyn Bar {
| ^^^^^^^^ the trait `Bar` cannot be made into an object
|
= help: consider moving `bar` to another trait
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/object-safety-mentions-Self.rs:11:22
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | fn bar(&self, x: &Self);
| ^^^^^ ...because method `bar` references the `Self` type in this parameter
error[E0038]: the trait `Baz` cannot be made into an object
--> $DIR/object-safety-mentions-Self.rs:28:30
|
LL | trait Baz {
| --- this trait cannot be made into an object...
LL | fn baz(&self) -> Self;
| ---- ...because method `baz` references the `Self` type in its return type
...
LL | fn make_baz<T:Baz>(t: &T) -> &dyn Baz {
| ^^^^^^^^ the trait `Baz` cannot be made into an object
|
= help: consider moving `baz` to another trait
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/object-safety-mentions-Self.rs:15:22
|
LL | trait Baz {
| --- this trait cannot be made into an object...
LL | fn baz(&self) -> Self;
| ^^^^ ...because method `baz` references the `Self` type in its return type
error: aborting due to 2 previous errors

24
src/test/ui/object-safety/object-safety-mentions-Self.object_safe_for_dispatch.stderr
View File

@ -1,30 +1,34 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/object-safety-mentions-Self.rs:24:5
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | fn bar(&self, x: &Self);
| ----- ...because method `bar` references the `Self` type in this parameter
...
LL | t
| ^ the trait `Bar` cannot be made into an object
|
= help: consider moving `bar` to another trait
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/object-safety-mentions-Self.rs:11:22
|
LL | trait Bar {
| --- this trait cannot be made into an object...
LL | fn bar(&self, x: &Self);
| ^^^^^ ...because method `bar` references the `Self` type in this parameter
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Bar>` for `&T`
= note: required by cast to type `&dyn Bar`
error[E0038]: the trait `Baz` cannot be made into an object
--> $DIR/object-safety-mentions-Self.rs:30:5
|
LL | trait Baz {
| --- this trait cannot be made into an object...
LL | fn baz(&self) -> Self;
| ---- ...because method `baz` references the `Self` type in its return type
...
LL | t
| ^ the trait `Baz` cannot be made into an object
|
= help: consider moving `baz` to another trait
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/object-safety-mentions-Self.rs:15:22
|
LL | trait Baz {
| --- this trait cannot be made into an object...
LL | fn baz(&self) -> Self;
| ^^^^ ...because method `baz` references the `Self` type in its return type
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Baz>` for `&T`
= note: required by cast to type `&dyn Baz`

16
src/test/ui/object-safety/object-safety-no-static.curr.stderr
View File

@ -1,15 +1,21 @@
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/object-safety-no-static.rs:12:18
|
LL | fn diverges() -> Box<dyn Foo> {
| ^^^^^^^^^^^^ the trait `Foo` 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/object-safety-no-static.rs:9:8
|
LL | trait Foo {
| --- this trait cannot be made into an object...
LL | fn foo() {}
| --- ...because associated function `foo` has no `self` parameter
...
LL | fn diverges() -> Box<dyn Foo> {
| ^^^^^^^^^^^^ the trait `Foo` cannot be made into an object
| ^^^ ...because associated function `foo` has no `self` parameter
help: consider turning `foo` into a method by giving it a `&self` argument
|
help: consider turning `foo` into a method by giving it a `&self` argument or constraining it so it does not apply to trait objects
LL | fn foo(&self) {}
| ^^^^^
help: alternatively, consider constraining `foo` so it does not apply to trait objects
|
LL | fn foo() where Self: Sized {}
| ^^^^^^^^^^^^^^^^^

18
src/test/ui/object-safety/object-safety-no-static.object_safe_for_dispatch.stderr
View File

@ -1,17 +1,23 @@
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/object-safety-no-static.rs:22:27
|
LL | let b: Box<dyn Foo> = Box::new(Bar);
| ^^^^^^^^^^^^^ the trait `Foo` 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/object-safety-no-static.rs:9:8
|
LL | trait Foo {
| --- this trait cannot be made into an object...
LL | fn foo() {}
| --- ...because associated function `foo` has no `self` parameter
...
LL | let b: Box<dyn Foo> = Box::new(Bar);
| ^^^^^^^^^^^^^ the trait `Foo` cannot be made into an object
|
| ^^^ ...because associated function `foo` has no `self` parameter
= note: required because of the requirements on the impl of `CoerceUnsized<Box<dyn Foo>>` for `Box<Bar>`
= note: required by cast to type `Box<dyn Foo>`
help: consider turning `foo` into a method by giving it a `&self` argument or constraining it so it does not apply to trait objects
help: consider turning `foo` into a method by giving it a `&self` argument
|
LL | fn foo(&self) {}
| ^^^^^
help: alternatively, consider constraining `foo` so it does not apply to trait objects
|
LL | fn foo() where Self: Sized {}
| ^^^^^^^^^^^^^^^^^

11
src/test/ui/object-safety/object-safety-sized-2.curr.stderr
View File

@ -1,13 +1,16 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/object-safety-sized-2.rs:14:30
|
LL | fn make_bar<T:Bar>(t: &T) -> &dyn Bar {
| ^^^^^^^^ the trait `Bar` 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/object-safety-sized-2.rs:9:18
|
LL | trait Bar
| --- this trait cannot be made into an object...
LL | where Self : Sized
| ----- ...because it requires `Self: Sized`
...
LL | fn make_bar<T:Bar>(t: &T) -> &dyn Bar {
| ^^^^^^^^ the trait `Bar` cannot be made into an object
| ^^^^^ ...because it requires `Self: Sized`
error: aborting due to previous error

12
src/test/ui/object-safety/object-safety-sized-2.object_safe_for_dispatch.stderr
View File

@ -1,14 +1,16 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/object-safety-sized-2.rs:16:5
|
LL | t
| ^ the trait `Bar` 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/object-safety-sized-2.rs:9:18
|
LL | trait Bar
| --- this trait cannot be made into an object...
LL | where Self : Sized
| ----- ...because it requires `Self: Sized`
...
LL | t
| ^ the trait `Bar` cannot be made into an object
|
| ^^^^^ ...because it requires `Self: Sized`
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Bar>` for `&T`
= note: required by cast to type `&dyn Bar`

13
src/test/ui/object-safety/object-safety-sized.curr.stderr
View File

@ -1,13 +1,16 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/object-safety-sized.rs:12:30
|
LL | trait Bar : Sized {
| --- ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | fn make_bar<T:Bar>(t: &T) -> &dyn Bar {
| ^^^^^^^^ the trait `Bar` 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/object-safety-sized.rs:8:13
|
LL | trait Bar : Sized {
| --- ^^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
error: aborting due to previous error

12
src/test/ui/object-safety/object-safety-sized.object_safe_for_dispatch.stderr
View File

@ -1,14 +1,16 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/object-safety-sized.rs:14:5
|
LL | trait Bar : Sized {
| --- ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | t
| ^ the trait `Bar` 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/object-safety-sized.rs:8:13
|
LL | trait Bar : Sized {
| --- ^^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Bar>` for `&T`
= note: required by cast to type `&dyn Bar`

13
src/test/ui/object-safety/object-safety-supertrait-mentions-Self.stderr
View File

@ -1,13 +1,16 @@
error[E0038]: the trait `Baz` cannot be made into an object
--> $DIR/object-safety-supertrait-mentions-Self.rs:15:31
|
LL | trait Baz : Bar<Self> {
| --- --------- ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
...
LL | fn make_baz<T:Baz>(t: &T) -> &dyn Baz {
| ^^^^^^^ the trait `Baz` 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/object-safety-supertrait-mentions-Self.rs:8:13
|
LL | trait Baz : Bar<Self> {
| --- ^^^^^^^^^ ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
error: aborting due to previous error

7
src/test/ui/resolve/issue-3907-2.stderr
View File

@ -3,11 +3,12 @@ error[E0038]: the trait `issue_3907::Foo` cannot be made into an object
|
LL | fn bar(_x: Foo) {}
| ^^^ the trait `issue_3907::Foo` cannot be made into an object
|
::: $DIR/auxiliary/issue-3907.rs:2:8
|
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/auxiliary/issue-3907.rs:2:8
|
LL | fn bar();
| --- the trait cannot be made into an object because associated function `bar` has no `self` parameter
| ^^^ the trait cannot be made into an object because associated function `bar` has no `self` parameter
error: aborting due to previous error

31
src/test/ui/self/arbitrary-self-types-not-object-safe.curr.stderr
View File

@ -1,31 +1,36 @@
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/arbitrary-self-types-not-object-safe.rs:33:32
|
LL | fn foo(self: &Rc<Self>) -> usize;
| --------- help: consider changing method `foo`'s `self` parameter to be `&self`: `&Self`
...
LL | let x = Rc::new(5usize) as Rc<dyn Foo>;
| ^^^^^^^^^^^ the trait `Foo` 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/arbitrary-self-types-not-object-safe.rs:8:18
|
LL | trait Foo {
| --- this trait cannot be made into an object...
LL | fn foo(self: &Rc<Self>) -> usize;
| ---------
| |
| ...because method `foo`'s `self` parameter cannot be dispatched on
| help: consider changing method `foo`'s `self` parameter to be `&self`: `&Self`
...
LL | let x = Rc::new(5usize) as Rc<dyn Foo>;
| ^^^^^^^^^^^ the trait `Foo` cannot be made into an object
| ^^^^^^^^^ ...because method `foo`'s `self` parameter cannot be dispatched on
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/arbitrary-self-types-not-object-safe.rs:33:13
|
LL | trait Foo {
| --- this trait cannot be made into an object...
LL | fn foo(self: &Rc<Self>) -> usize;
| ---------
| |
| ...because method `foo`'s `self` parameter cannot be dispatched on
| help: consider changing method `foo`'s `self` parameter to be `&self`: `&Self`
| --------- help: consider changing method `foo`'s `self` parameter to be `&self`: `&Self`
...
LL | let x = Rc::new(5usize) as Rc<dyn Foo>;
| ^^^^^^^^^^^^^^^ the trait `Foo` 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/arbitrary-self-types-not-object-safe.rs:8:18
|
LL | trait Foo {
| --- this trait cannot be made into an object...
LL | fn foo(self: &Rc<Self>) -> usize;
| ^^^^^^^^^ ...because method `foo`'s `self` parameter cannot be dispatched on
= note: required because of the requirements on the impl of `CoerceUnsized<Rc<dyn Foo>>` for `Rc<usize>`
= note: required by cast to type `Rc<dyn Foo>`

14
src/test/ui/self/arbitrary-self-types-not-object-safe.object_safe_for_dispatch.stderr
View File

@ -1,17 +1,19 @@
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/arbitrary-self-types-not-object-safe.rs:33:13
|
LL | trait Foo {
| --- this trait cannot be made into an object...
LL | fn foo(self: &Rc<Self>) -> usize;
| ---------
| |
| ...because method `foo`'s `self` parameter cannot be dispatched on
| help: consider changing method `foo`'s `self` parameter to be `&self`: `&Self`
| --------- help: consider changing method `foo`'s `self` parameter to be `&self`: `&Self`
...
LL | let x = Rc::new(5usize) as Rc<dyn Foo>;
| ^^^^^^^^^^^^^^^ the trait `Foo` 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/arbitrary-self-types-not-object-safe.rs:8:18
|
LL | trait Foo {
| --- this trait cannot be made into an object...
LL | fn foo(self: &Rc<Self>) -> usize;
| ^^^^^^^^^ ...because method `foo`'s `self` parameter cannot be dispatched on
= note: required because of the requirements on the impl of `CoerceUnsized<Rc<dyn Foo>>` for `Rc<usize>`
= note: required by cast to type `Rc<dyn Foo>`

29
src/test/ui/suggestions/object-unsafe-trait-references-self.stderr
View File

@ -1,29 +1,34 @@
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/object-unsafe-trait-references-self.rs:6:11
|
LL | trait Trait {
| ----- this trait cannot be made into an object...
LL | fn baz(&self, _: Self) {}
| ---- ...because method `baz` references the `Self` type in this parameter
LL | fn bat(&self) -> Self {}
| ---- ...because method `bat` references the `Self` type in its return type
...
LL | fn bar(x: &dyn Trait) {}
| ^^^^^^^^^^ the trait `Trait` cannot be made into an object
|
= help: consider moving `baz` to another trait
= help: consider moving `bat` to another trait
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/object-unsafe-trait-references-self.rs:2:22
|
LL | trait Trait {
| ----- this trait cannot be made into an object...
LL | fn baz(&self, _: Self) {}
| ^^^^ ...because method `baz` references the `Self` type in this parameter
LL | fn bat(&self) -> Self {}
| ^^^^ ...because method `bat` references the `Self` type in its return type
error[E0038]: the trait `Other` cannot be made into an object
--> $DIR/object-unsafe-trait-references-self.rs:10:11
|
LL | trait Other: Sized {}
| ----- ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
LL |
LL | fn foo(x: &dyn Other) {}
| ^^^^^^^^^^ the trait `Other` 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/object-unsafe-trait-references-self.rs:8:14
|
LL | trait Other: Sized {}
| ----- ^^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
error: aborting due to 2 previous errors

27
src/test/ui/suggestions/object-unsafe-trait-should-use-self.stderr
View File

@ -14,12 +14,16 @@ LL | fn f(a: Self) -> Self;
error[E0038]: the trait `A` cannot be made into an object
--> $DIR/object-unsafe-trait-should-use-self.rs:3:13
|
LL | trait A: Sized {
| - ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
LL | fn f(a: A) -> A;
| ^ the trait `A` 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/object-unsafe-trait-should-use-self.rs:2:10
|
LL | trait A: Sized {
| - ^^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
error: associated item referring to unboxed trait object for its own trait
--> $DIR/object-unsafe-trait-should-use-self.rs:8:13
@ -37,14 +41,21 @@ LL | fn f(a: Self) -> Self;
error[E0038]: the trait `B` cannot be made into an object
--> $DIR/object-unsafe-trait-should-use-self.rs:8:13
|
LL | fn f(a: B) -> B;
| ^ the trait `B` 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/object-unsafe-trait-should-use-self.rs:8:8
|
LL | trait B {
| - this trait cannot be made into an object...
LL | fn f(a: B) -> B;
| - ^ the trait `B` cannot be made into an object
| |
| ...because associated function `f` has no `self` parameter
| ^ ...because associated function `f` has no `self` parameter
help: consider turning `f` into a method by giving it a `&self` argument
|
help: consider turning `f` into a method by giving it a `&self` argument or constraining it so it does not apply to trait objects
LL | fn f(&self, a: B) -> B;
| ^^^^^^
help: alternatively, consider constraining `f` so it does not apply to trait objects
|
LL | fn f(a: B) -> B where Self: Sized;
| ^^^^^^^^^^^^^^^^^

2
src/test/ui/suggestions/object-unsafe-trait-should-use-where-sized.fixed
View File

@ -2,7 +2,7 @@
#![allow(unused_variables, dead_code)]
trait Trait {
fn foo() where Self: Other, Self: Sized, { }
fn foo(&self) where Self: Other, Self: Sized, { }
fn bar(self: &Self) {} //~ ERROR invalid `self` parameter type
}

18
src/test/ui/suggestions/object-unsafe-trait-should-use-where-sized.stderr
View File

@ -1,17 +1,23 @@
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/object-unsafe-trait-should-use-where-sized.rs:9:11
|
LL | fn bar(x: &dyn Trait) {}
| ^^^^^^^^^^ the trait `Trait` 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/object-unsafe-trait-should-use-where-sized.rs:5:8
|
LL | trait Trait {
| ----- this trait cannot be made into an object...
LL | fn foo() where Self: Other, { }
| --- ...because associated function `foo` has no `self` parameter
| ^^^ ...because associated function `foo` has no `self` parameter
LL | fn bar(self: ()) {}
| -- ...because method `bar`'s `self` parameter cannot be dispatched on
...
LL | fn bar(x: &dyn Trait) {}
| ^^^^^^^^^^ the trait `Trait` cannot be made into an object
| ^^ ...because method `bar`'s `self` parameter cannot be dispatched on
help: consider turning `foo` into a method by giving it a `&self` argument
|
help: consider turning `foo` into a method by giving it a `&self` argument or constraining it so it does not apply to trait objects
LL | fn foo(&self) where Self: Other, { }
| ^^^^^
help: alternatively, consider constraining `foo` so it does not apply to trait objects
|
LL | fn foo() where Self: Other, Self: Sized, { }
| ^^^^^^^^^^^^^

15
src/test/ui/traits/issue-72410.stderr
View File

@ -1,14 +1,21 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/issue-72410.rs:14:19
|
LL | where for<'a> &'a mut [dyn Bar]: ;
| ^^^^^^^^^^^^^^^^^ the trait `Bar` 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/issue-72410.rs:13:8
|
LL | pub trait Bar {
| --- this trait cannot be made into an object...
LL | fn map()
| --- ...because associated function `map` has no `self` parameter
LL | where for<'a> &'a mut [dyn Bar]: ;
| ^^^^^^^^^^^^^^^^^ the trait `Bar` cannot be made into an object
| ^^^ ...because associated function `map` has no `self` parameter
help: consider turning `map` into a method by giving it a `&self` argument
|
help: consider turning `map` into a method by giving it a `&self` argument or constraining it so it does not apply to trait objects
LL | fn map(&self)
| ^^^^^
help: alternatively, consider constraining `map` so it does not apply to trait objects
|
LL | where for<'a> &'a mut [dyn Bar]:, Self: Sized ;
| ^^^^^^^^^^^^^

7
src/test/ui/traits/trait-alias/trait-alias-object-fail.stderr
View File

@ -3,11 +3,12 @@ error[E0038]: the trait `Eq` cannot be made into an object
|
LL | let _: &dyn EqAlias = &123;
| ^^^^^^^^^^^ the trait `Eq` cannot be made into an object
|
::: $SRC_DIR/core/src/cmp.rs:LL:COL
|
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>
--> $SRC_DIR/core/src/cmp.rs:LL:COL
|
LL | pub trait Eq: PartialEq<Self> {
| --------------- the trait cannot be made into an object because it uses `Self` as a type parameter in this
| ^^^^^^^^^^^^^^^ the trait cannot be made into an object because it uses `Self` as a type parameter in this
error[E0191]: the value of the associated type `Item` (from trait `Iterator`) must be specified
--> $DIR/trait-alias-object-fail.rs:9:17

24
src/test/ui/traits/trait-item-privacy.stderr
View File

@ -112,23 +112,25 @@ LL | C::A;
error[E0038]: the trait `assoc_const::C` cannot be made into an object
--> $DIR/trait-item-privacy.rs:101:5
|
LL | const A: u8 = 0;
| - ...because it contains this associated `const`
...
LL | const B: u8 = 0;
| - ...because it contains this associated `const`
...
LL | pub trait C: A + B {
| - this trait cannot be made into an object...
LL | const C: u8 = 0;
| - ...because it contains this associated `const`
...
LL | C::A;
| ^^^^ the trait `assoc_const::C` cannot be made into an object
|
= help: consider moving `C` to another trait
= help: consider moving `B` to another trait
= help: consider moving `A` to another trait
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/trait-item-privacy.rs:25:15
|
LL | const A: u8 = 0;
| ^ ...because it contains this associated `const`
...
LL | const B: u8 = 0;
| ^ ...because it contains this associated `const`
...
LL | pub trait C: A + B {
| - this trait cannot be made into an object...
LL | const C: u8 = 0;
| ^ ...because it contains this associated `const`
error[E0223]: ambiguous associated type
--> $DIR/trait-item-privacy.rs:115:12

1
src/test/ui/traits/trait-object-macro-matcher.stderr
View File

@ -11,6 +11,7 @@ LL | m!(dyn Copy + Send + 'static);
| ^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Copy` cannot be made into an object
|
= note: the trait cannot be made into an object because it requires `Self: Sized`
= 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>
error: aborting due to 2 previous errors

36
src/test/ui/traits/trait-object-safety.stderr
View File

@ -1,17 +1,23 @@
error[E0038]: the trait `Tr` cannot be made into an object
--> $DIR/trait-object-safety.rs:15:22
|
LL | let _: &dyn Tr = &St;
| ^^^ the trait `Tr` 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/trait-object-safety.rs:4:8
|
LL | trait Tr {
| -- this trait cannot be made into an object...
LL | fn foo();
| --- ...because associated function `foo` has no `self` parameter
...
LL | let _: &dyn Tr = &St;
| ^^^ the trait `Tr` cannot be made into an object
|
| ^^^ ...because associated function `foo` has no `self` parameter
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Tr>` for `&St`
= note: required by cast to type `&dyn Tr`
help: consider turning `foo` into a method by giving it a `&self` argument or constraining it so it does not apply to trait objects
help: consider turning `foo` into a method by giving it a `&self` argument
|
LL | fn foo(&self);
| ^^^^^
help: alternatively, consider constraining `foo` so it does not apply to trait objects
|
LL | fn foo() where Self: Sized;
| ^^^^^^^^^^^^^^^^^
@ -19,15 +25,21 @@ LL | fn foo() where Self: Sized;
error[E0038]: the trait `Tr` cannot be made into an object
--> $DIR/trait-object-safety.rs:15:12
|
LL | trait Tr {
| -- this trait cannot be made into an object...
LL | fn foo();
| --- ...because associated function `foo` has no `self` parameter
...
LL | let _: &dyn Tr = &St;
| ^^^^^^^ the trait `Tr` cannot be made into an object
|
help: consider turning `foo` into a method by giving it a `&self` argument or constraining it so it does not apply to trait objects
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/trait-object-safety.rs:4:8
|
LL | trait Tr {
| -- this trait cannot be made into an object...
LL | fn foo();
| ^^^ ...because associated function `foo` has no `self` parameter
help: consider turning `foo` into a method by giving it a `&self` argument
|
LL | fn foo(&self);
| ^^^^^
help: alternatively, consider constraining `foo` so it does not apply to trait objects
|
LL | fn foo() where Self: Sized;
| ^^^^^^^^^^^^^^^^^

28
src/test/ui/traits/trait-test-2.stderr
View File

@ -13,32 +13,36 @@ LL | 10.blah::<i32, i32>();
error[E0038]: the trait `bar` cannot be made into an object
--> $DIR/trait-test-2.rs:11:16
|
LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
| --- ---- ---- ...because method `blah` has generic type parameters
| | |
| | ...because method `dup` references the `Self` type in its return type
| this trait cannot be made into an object...
...
LL | (box 10 as Box<dyn bar>).dup();
| ^^^^^^^^^^^^ the trait `bar` cannot be made into an object
|
= help: consider moving `dup` to another trait
= help: consider moving `blah` to another trait
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/trait-test-2.rs:4:30
|
LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
| --- ^^^^ ^^^^ ...because method `blah` has generic type parameters
| | |
| | ...because method `dup` references the `Self` type in its return type
| this trait cannot be made into an object...
error[E0038]: the trait `bar` cannot be made into an object
--> $DIR/trait-test-2.rs:11:6
|
LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
| --- ---- ---- ...because method `blah` has generic type parameters
| | |
| | ...because method `dup` references the `Self` type in its return type
| this trait cannot be made into an object...
...
LL | (box 10 as Box<dyn bar>).dup();
| ^^^^^^ the trait `bar` cannot be made into an object
|
= help: consider moving `dup` to another trait
= help: consider moving `blah` to another trait
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/trait-test-2.rs:4:30
|
LL | trait bar { fn dup(&self) -> Self; fn blah<X>(&self); }
| --- ^^^^ ^^^^ ...because method `blah` has generic type parameters
| | |
| | ...because method `dup` references the `Self` type in its return type
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<Box<dyn bar>>` for `Box<{integer}>`
= note: required by cast to type `Box<dyn bar>`

12
src/test/ui/type/type-parameter-defaults-referencing-Self-ppaux.stderr
View File

@ -13,15 +13,17 @@ LL | let y = x as dyn MyAdd<i32>;
error[E0038]: the trait `MyAdd` cannot be made into an object
--> $DIR/type-parameter-defaults-referencing-Self-ppaux.rs:14:18
|
LL | trait MyAdd<Rhs=Self> { fn add(&self, other: &Rhs) -> Self; }
| ----- ---- ...because method `add` references the `Self` type in its return type
| |
| this trait cannot be made into an object...
...
LL | let y = x as dyn MyAdd<i32>;
| ^^^^^^^^^^^^^^ the trait `MyAdd` cannot be made into an object
|
= help: consider moving `add` to another trait
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/type-parameter-defaults-referencing-Self-ppaux.rs:6:55
|
LL | trait MyAdd<Rhs=Self> { fn add(&self, other: &Rhs) -> Self; }
| ----- ^^^^ ...because method `add` references the `Self` type in its return type
| |
| this trait cannot be made into an object...
error: aborting due to 2 previous errors

36
src/test/ui/wf/wf-convert-unsafe-trait-obj-box.stderr
View File

@ -1,42 +1,48 @@
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/wf-convert-unsafe-trait-obj-box.rs:16:33
|
LL | trait Trait: Sized {}
| ----- ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | let t_box: Box<dyn Trait> = Box::new(S);
| ^^^^^^^^^^^ the trait `Trait` 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/wf-convert-unsafe-trait-obj-box.rs:6:14
|
LL | trait Trait: Sized {}
| ----- ^^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<Box<dyn Trait>>` for `Box<S>`
= note: required by cast to type `Box<dyn Trait>`
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/wf-convert-unsafe-trait-obj-box.rs:17:15
|
LL | trait Trait: Sized {}
| ----- ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | takes_box(Box::new(S));
| ^^^^^^^^^^^ the trait `Trait` 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/wf-convert-unsafe-trait-obj-box.rs:6:14
|
LL | trait Trait: Sized {}
| ----- ^^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<Box<dyn Trait>>` for `Box<S>`
= note: required by cast to type `Box<(dyn Trait + 'static)>`
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/wf-convert-unsafe-trait-obj-box.rs:15:5
|
LL | trait Trait: Sized {}
| ----- ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | Box::new(S) as Box<dyn Trait>;
| ^^^^^^^^^^^ the trait `Trait` 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/wf-convert-unsafe-trait-obj-box.rs:6:14
|
LL | trait Trait: Sized {}
| ----- ^^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<Box<dyn Trait>>` for `Box<S>`
= note: required by cast to type `Box<dyn Trait>`

36
src/test/ui/wf/wf-convert-unsafe-trait-obj.stderr
View File

@ -1,42 +1,48 @@
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/wf-convert-unsafe-trait-obj.rs:16:25
|
LL | trait Trait: Sized {}
| ----- ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | let t: &dyn Trait = &S;
| ^^ the trait `Trait` 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/wf-convert-unsafe-trait-obj.rs:6:14
|
LL | trait Trait: Sized {}
| ----- ^^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Trait>` for `&S`
= note: required by cast to type `&dyn Trait`
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/wf-convert-unsafe-trait-obj.rs:17:17
|
LL | trait Trait: Sized {}
| ----- ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | takes_trait(&S);
| ^^ the trait `Trait` 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/wf-convert-unsafe-trait-obj.rs:6:14
|
LL | trait Trait: Sized {}
| ----- ^^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Trait>` for `&S`
= note: required by cast to type `&dyn Trait`
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/wf-convert-unsafe-trait-obj.rs:15:5
|
LL | trait Trait: Sized {}
| ----- ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | &S as &dyn Trait;
| ^^ the trait `Trait` 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/wf-convert-unsafe-trait-obj.rs:6:14
|
LL | trait Trait: Sized {}
| ----- ^^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Trait>` for `&S`
= note: required by cast to type `&dyn Trait`

1
src/test/ui/wf/wf-fn-where-clause.stderr
View File

@ -37,6 +37,7 @@ LL | fn bar() where Vec<dyn Copy>:, {}
| ^^^^^^^^^^^^^ the trait `Copy` cannot be made into an object
|
= note: the trait cannot be made into an object because it requires `Self: Sized`
= 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>
error: aborting due to 3 previous errors

12
src/test/ui/wf/wf-object-safe.stderr
View File

@ -1,15 +1,17 @@
error[E0038]: the trait `A` cannot be made into an object
--> $DIR/wf-object-safe.rs:9:13
|
LL | trait A {
| - this trait cannot be made into an object...
LL | fn foo(&self, _x: &Self);
| ----- ...because method `foo` references the `Self` type in this parameter
...
LL | let _x: &dyn A;
| ^^^^^^ the trait `A` cannot be made into an object
|
= help: consider moving `foo` to another trait
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/wf-object-safe.rs:5:23
|
LL | trait A {
| - this trait cannot be made into an object...
LL | fn foo(&self, _x: &Self);
| ^^^^^ ...because method `foo` references the `Self` type in this parameter
error: aborting due to previous error

24
src/test/ui/wf/wf-unsafe-trait-obj-match.stderr
View File

@ -15,28 +15,32 @@ LL | | }
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/wf-unsafe-trait-obj-match.rs:26:21
|
LL | trait Trait: Sized {}
| ----- ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | Some(()) => &S,
| ^^ the trait `Trait` 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/wf-unsafe-trait-obj-match.rs:6:14
|
LL | trait Trait: Sized {}
| ----- ^^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Trait>` for `&S`
= note: required by cast to type `&dyn Trait`
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/wf-unsafe-trait-obj-match.rs:25:25
|
LL | trait Trait: Sized {}
| ----- ----- ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
...
LL | let t: &dyn Trait = match opt() {
| ^^^^^^^^^^^ the trait `Trait` 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/wf-unsafe-trait-obj-match.rs:6:14
|
LL | trait Trait: Sized {}
| ----- ^^^^^ ...because it requires `Self: Sized`
| |
| this trait cannot be made into an object...
= note: required because of the requirements on the impl of `CoerceUnsized<&dyn Trait>` for `&R`
= note: required by cast to type `&dyn Trait`