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Rollup merge of #108063 - compiler-errors:associated-type-bounds-in-bad-position, r=cjgillot

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Ban associated type bounds in bad positions

We should not try to lower associated type bounds into TAITs in positions where `impl Trait` is not allowed (except for in `where` clauses, like `where T: Trait<Assoc: Bound>`).

This is achieved by using the same `rustc_ast_lowering` machinery as impl-trait does to characterize positions as universal/existential/disallowed.

Fixes #106077

Split out the first commit into #108066, since it's not really related.
This commit is contained in:
Matthias Krüger 2023-02-23 06:18:05 +01:00 committed by GitHub
commit ef27e43807
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GPG Key ID: 4AEE18F83AFDEB23
33 changed files with 219 additions and 274 deletions
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3
compiler/rustc_ast_lowering/locales/en-US.ftl
View File

@ -19,6 +19,9 @@ ast_lowering_remove_parentheses = remove these parentheses
ast_lowering_misplaced_impl_trait =
`impl Trait` only allowed in function and inherent method return types, not in {$position}
ast_lowering_misplaced_assoc_ty_binding =
associated type bounds are only allowed in where clauses and function signatures, not in {$position}
ast_lowering_rustc_box_attribute_error =
#[rustc_box] requires precisely one argument and no other attributes are allowed

8
compiler/rustc_ast_lowering/src/errors.rs
View File

@ -79,6 +79,14 @@ pub struct MisplacedImplTrait<'a> {
pub position: DiagnosticArgFromDisplay<'a>,
}
#[derive(Diagnostic)]
#[diag(ast_lowering_misplaced_assoc_ty_binding)]
pub struct MisplacedAssocTyBinding<'a> {
#[primary_span]
pub span: Span,
pub position: DiagnosticArgFromDisplay<'a>,
}
#[derive(Diagnostic, Clone, Copy)]
#[diag(ast_lowering_rustc_box_attribute_error)]
pub struct RustcBoxAttributeError {

131
compiler/rustc_ast_lowering/src/lib.rs
View File

@ -288,31 +288,31 @@ enum ImplTraitPosition {
impl std::fmt::Display for ImplTraitPosition {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let name = match self {
ImplTraitPosition::Path => "path",
ImplTraitPosition::Variable => "variable binding",
ImplTraitPosition::Trait => "trait",
ImplTraitPosition::AsyncBlock => "async block",
ImplTraitPosition::Bound => "bound",
ImplTraitPosition::Generic => "generic",
ImplTraitPosition::ExternFnParam => "`extern fn` param",
ImplTraitPosition::ClosureParam => "closure param",
ImplTraitPosition::PointerParam => "`fn` pointer param",
ImplTraitPosition::FnTraitParam => "`Fn` trait param",
ImplTraitPosition::TraitParam => "trait method param",
ImplTraitPosition::ImplParam => "`impl` method param",
ImplTraitPosition::ExternFnReturn => "`extern fn` return",
ImplTraitPosition::ClosureReturn => "closure return",
ImplTraitPosition::PointerReturn => "`fn` pointer return",
ImplTraitPosition::FnTraitReturn => "`Fn` trait return",
ImplTraitPosition::TraitReturn => "trait method return",
ImplTraitPosition::ImplReturn => "`impl` method return",
ImplTraitPosition::GenericDefault => "generic parameter default",
ImplTraitPosition::ConstTy => "const type",
ImplTraitPosition::StaticTy => "static type",
ImplTraitPosition::AssocTy => "associated type",
ImplTraitPosition::FieldTy => "field type",
ImplTraitPosition::Cast => "cast type",
ImplTraitPosition::ImplSelf => "impl header",
ImplTraitPosition::Path => "paths",
ImplTraitPosition::Variable => "variable bindings",
ImplTraitPosition::Trait => "traits",
ImplTraitPosition::AsyncBlock => "async blocks",
ImplTraitPosition::Bound => "bounds",
ImplTraitPosition::Generic => "generics",
ImplTraitPosition::ExternFnParam => "`extern fn` params",
ImplTraitPosition::ClosureParam => "closure params",
ImplTraitPosition::PointerParam => "`fn` pointer params",
ImplTraitPosition::FnTraitParam => "`Fn` trait params",
ImplTraitPosition::TraitParam => "trait method params",
ImplTraitPosition::ImplParam => "`impl` method params",
ImplTraitPosition::ExternFnReturn => "`extern fn` return types",
ImplTraitPosition::ClosureReturn => "closure return types",
ImplTraitPosition::PointerReturn => "`fn` pointer return types",
ImplTraitPosition::FnTraitReturn => "`Fn` trait return types",
ImplTraitPosition::TraitReturn => "trait method return types",
ImplTraitPosition::ImplReturn => "`impl` method return types",
ImplTraitPosition::GenericDefault => "generic parameter defaults",
ImplTraitPosition::ConstTy => "const types",
ImplTraitPosition::StaticTy => "static types",
ImplTraitPosition::AssocTy => "associated types",
ImplTraitPosition::FieldTy => "field types",
ImplTraitPosition::Cast => "cast types",
ImplTraitPosition::ImplSelf => "impl headers",
};
write!(f, "{name}")
@ -1002,8 +1002,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
} else {
self.arena.alloc(hir::GenericArgs::none())
};
let itctx_tait = &ImplTraitContext::TypeAliasesOpaqueTy;
let kind = match &constraint.kind {
AssocConstraintKind::Equality { term } => {
let term = match term {
@ -1013,8 +1011,14 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
hir::TypeBindingKind::Equality { term }
}
AssocConstraintKind::Bound { bounds } => {
enum DesugarKind<'a> {
ImplTrait,
Error(&'a ImplTraitPosition),
Bound,
}
// Piggy-back on the `impl Trait` context to figure out the correct behavior.
let (desugar_to_impl_trait, itctx) = match itctx {
let desugar_kind = match itctx {
// We are in the return position:
//
// fn foo() -> impl Iterator<Item: Debug>
@ -1023,7 +1027,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
//
// fn foo() -> impl Iterator<Item = impl Debug>
ImplTraitContext::ReturnPositionOpaqueTy { .. }
| ImplTraitContext::TypeAliasesOpaqueTy { .. } => (true, itctx),
| ImplTraitContext::TypeAliasesOpaqueTy { .. } => DesugarKind::ImplTrait,
// We are in the argument position, but within a dyn type:
//
@ -1032,15 +1036,11 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
// so desugar to
//
// fn foo(x: dyn Iterator<Item = impl Debug>)
ImplTraitContext::Universal if self.is_in_dyn_type => (true, itctx),
ImplTraitContext::Universal if self.is_in_dyn_type => DesugarKind::ImplTrait,
// In `type Foo = dyn Iterator<Item: Debug>` we desugar to
// `type Foo = dyn Iterator<Item = impl Debug>` but we have to override the
// "impl trait context" to permit `impl Debug` in this position (it desugars
// then to an opaque type).
//
// FIXME: this is only needed until `impl Trait` is allowed in type aliases.
ImplTraitContext::Disallowed(_) if self.is_in_dyn_type => (true, itctx_tait),
ImplTraitContext::Disallowed(position) if self.is_in_dyn_type => {
DesugarKind::Error(position)
}
// We are in the parameter position, but not within a dyn type:
//
@ -1049,35 +1049,46 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
// so we leave it as is and this gets expanded in astconv to a bound like
// `<T as Iterator>::Item: Debug` where `T` is the type parameter for the
// `impl Iterator`.
_ => (false, itctx),
_ => DesugarKind::Bound,
};
if desugar_to_impl_trait {
// Desugar `AssocTy: Bounds` into `AssocTy = impl Bounds`. We do this by
// constructing the HIR for `impl bounds...` and then lowering that.
match desugar_kind {
DesugarKind::ImplTrait => {
// Desugar `AssocTy: Bounds` into `AssocTy = impl Bounds`. We do this by
// constructing the HIR for `impl bounds...` and then lowering that.
let impl_trait_node_id = self.next_node_id();
let impl_trait_node_id = self.next_node_id();
self.with_dyn_type_scope(false, |this| {
let node_id = this.next_node_id();
let ty = this.lower_ty(
&Ty {
id: node_id,
kind: TyKind::ImplTrait(impl_trait_node_id, bounds.clone()),
span: this.lower_span(constraint.span),
tokens: None,
},
itctx,
);
self.with_dyn_type_scope(false, |this| {
let node_id = this.next_node_id();
let ty = this.lower_ty(
&Ty {
id: node_id,
kind: TyKind::ImplTrait(impl_trait_node_id, bounds.clone()),
span: this.lower_span(constraint.span),
tokens: None,
},
itctx,
);
hir::TypeBindingKind::Equality { term: ty.into() }
})
} else {
// Desugar `AssocTy: Bounds` into a type binding where the
// later desugars into a trait predicate.
let bounds = self.lower_param_bounds(bounds, itctx);
hir::TypeBindingKind::Equality { term: ty.into() }
})
}
DesugarKind::Bound => {
// Desugar `AssocTy: Bounds` into a type binding where the
// later desugars into a trait predicate.
let bounds = self.lower_param_bounds(bounds, itctx);
hir::TypeBindingKind::Constraint { bounds }
hir::TypeBindingKind::Constraint { bounds }
}
DesugarKind::Error(position) => {
self.tcx.sess.emit_err(errors::MisplacedAssocTyBinding {
span: constraint.span,
position: DiagnosticArgFromDisplay(position),
});
let err_ty = &*self.arena.alloc(self.ty(constraint.span, hir::TyKind::Err));
hir::TypeBindingKind::Equality { term: err_ty.into() }
}
}
}
};

3
compiler/rustc_ast_passes/locales/en-US.ftl
View File

@ -11,9 +11,6 @@ ast_passes_forbidden_let_stable =
ast_passes_deprecated_where_clause_location =
where clause not allowed here
ast_passes_forbidden_assoc_constraint =
associated type bounds are not allowed within structs, enums, or unions
ast_passes_keyword_lifetime =
lifetimes cannot use keyword names

33
compiler/rustc_ast_passes/src/ast_validation.rs
View File

@ -71,10 +71,6 @@ struct AstValidator<'a> {
/// or `Foo::Bar<impl Trait>`
is_impl_trait_banned: bool,
/// Used to ban associated type bounds (i.e., `Type<AssocType: Bounds>`) in
/// certain positions.
is_assoc_ty_bound_banned: bool,
/// See [ForbiddenLetReason]
forbidden_let_reason: Option<ForbiddenLetReason>,
@ -180,30 +176,12 @@ impl<'a> AstValidator<'a> {
}
}
fn with_banned_assoc_ty_bound(&mut self, f: impl FnOnce(&mut Self)) {
let old = mem::replace(&mut self.is_assoc_ty_bound_banned, true);
f(self);
self.is_assoc_ty_bound_banned = old;
}
fn with_impl_trait(&mut self, outer: Option<Span>, f: impl FnOnce(&mut Self)) {
let old = mem::replace(&mut self.outer_impl_trait, outer);
f(self);
self.outer_impl_trait = old;
}
fn visit_assoc_constraint_from_generic_args(&mut self, constraint: &'a AssocConstraint) {
match constraint.kind {
AssocConstraintKind::Equality { .. } => {}
AssocConstraintKind::Bound { .. } => {
if self.is_assoc_ty_bound_banned {
self.session.emit_err(ForbiddenAssocConstraint { span: constraint.span });
}
}
}
self.visit_assoc_constraint(constraint);
}
// Mirrors `visit::walk_ty`, but tracks relevant state.
fn walk_ty(&mut self, t: &'a Ty) {
match &t.kind {
@ -1248,7 +1226,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
// are allowed to contain nested `impl Trait`.
AngleBracketedArg::Constraint(constraint) => {
self.with_impl_trait(None, |this| {
this.visit_assoc_constraint_from_generic_args(constraint);
this.visit_assoc_constraint(constraint);
});
}
}
@ -1373,14 +1351,6 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
visit::walk_param_bound(self, bound)
}
fn visit_variant_data(&mut self, s: &'a VariantData) {
self.with_banned_assoc_ty_bound(|this| visit::walk_struct_def(this, s))
}
fn visit_enum_def(&mut self, enum_definition: &'a EnumDef) {
self.with_banned_assoc_ty_bound(|this| visit::walk_enum_def(this, enum_definition))
}
fn visit_fn(&mut self, fk: FnKind<'a>, span: Span, id: NodeId) {
// Only associated `fn`s can have `self` parameters.
let self_semantic = match fk.ctxt() {
@ -1709,7 +1679,6 @@ pub fn check_crate(session: &Session, krate: &Crate, lints: &mut LintBuffer) ->
outer_impl_trait: None,
disallow_tilde_const: None,
is_impl_trait_banned: false,
is_assoc_ty_bound_banned: false,
forbidden_let_reason: Some(ForbiddenLetReason::GenericForbidden),
lint_buffer: lints,
};

7
compiler/rustc_ast_passes/src/errors.rs
View File

@ -23,13 +23,6 @@ pub struct ForbiddenLetStable {
pub span: Span,
}
#[derive(Diagnostic)]
#[diag(ast_passes_forbidden_assoc_constraint)]
pub struct ForbiddenAssocConstraint {
#[primary_span]
pub span: Span,
}
#[derive(Diagnostic)]
#[diag(ast_passes_keyword_lifetime)]
pub struct KeywordLifetime {

2
tests/ui/associated-consts/issue-105330.stderr
View File

@ -33,7 +33,7 @@ LL | fn main<A: TraitWAssocConst<A=32>>() {
= note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
= help: add `#![feature(associated_const_equality)]` to the crate attributes to enable
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in impl header
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in impl headers
--> $DIR/issue-105330.rs:6:27
|
LL | impl TraitWAssocConst for impl Demo {

14
tests/ui/associated-type-bounds/bad-universal-in-dyn-in-where-clause.rs Normal file
View File

@ -0,0 +1,14 @@
#![feature(associated_type_bounds)]
trait B {
type AssocType;
}
fn f()
where
dyn for<'j> B<AssocType: 'j>:,
//~^ ERROR associated type bounds are only allowed in where clauses and function signatures
{
}
fn main() {}

8
tests/ui/associated-type-bounds/bad-universal-in-dyn-in-where-clause.stderr Normal file
View File

@ -0,0 +1,8 @@
error: associated type bounds are only allowed in where clauses and function signatures, not in bounds
--> $DIR/bad-universal-in-dyn-in-where-clause.rs:9:19
|
LL | dyn for<'j> B<AssocType: 'j>:,
| ^^^^^^^^^^^^^
error: aborting due to previous error

13
tests/ui/associated-type-bounds/bad-universal-in-impl-sig.rs Normal file
View File

@ -0,0 +1,13 @@
#![feature(associated_type_bounds)]
trait Trait {
type Item;
}
trait Trait2 {}
// It's not possible to insert a universal `impl Trait` here!
impl dyn Trait<Item: Trait2> {}
//~^ ERROR associated type bounds are only allowed in where clauses and function signatures
fn main() {}

8
tests/ui/associated-type-bounds/bad-universal-in-impl-sig.stderr Normal file
View File

@ -0,0 +1,8 @@
error: associated type bounds are only allowed in where clauses and function signatures, not in impl headers
--> $DIR/bad-universal-in-impl-sig.rs:10:16
|
LL | impl dyn Trait<Item: Trait2> {}
| ^^^^^^^^^^^^
error: aborting due to previous error

22
tests/ui/associated-type-bounds/inside-adt.rs
View File

@ -3,28 +3,24 @@
use std::mem::ManuallyDrop;
struct S1 { f: dyn Iterator<Item: Copy> }
//~^ ERROR associated type bounds are not allowed within structs, enums, or unions
//~^ ERROR associated type bounds are only allowed in where clauses and function signatures
struct S2 { f: Box<dyn Iterator<Item: Copy>> }
//~^ ERROR associated type bounds are not allowed within structs, enums, or unions
//~^ ERROR associated type bounds are only allowed in where clauses and function signatures
struct S3 { f: dyn Iterator<Item: 'static> }
//~^ ERROR associated type bounds are not allowed within structs, enums, or unions
//~^ ERROR associated type bounds are only allowed in where clauses and function signatures
enum E1 { V(dyn Iterator<Item: Copy>) }
//~^ ERROR associated type bounds are not allowed within structs, enums, or unions
//~| ERROR the size for values of type `(dyn Iterator<Item = impl Copy> + 'static)`
//~^ ERROR associated type bounds are only allowed in where clauses and function signatures
enum E2 { V(Box<dyn Iterator<Item: Copy>>) }
//~^ ERROR associated type bounds are not allowed within structs, enums, or unions
//~^ ERROR associated type bounds are only allowed in where clauses and function signatures
enum E3 { V(dyn Iterator<Item: 'static>) }
//~^ ERROR associated type bounds are not allowed within structs, enums, or unions
//~| ERROR the size for values of type `(dyn Iterator<Item = impl Sized + 'static> + 'static)`
//~^ ERROR associated type bounds are only allowed in where clauses and function signatures
union U1 { f: ManuallyDrop<dyn Iterator<Item: Copy>> }
//~^ ERROR associated type bounds are not allowed within structs, enums, or unions
//~| ERROR the size for values of type `(dyn Iterator<Item = impl Copy> + 'static)`
//~^ ERROR associated type bounds are only allowed in where clauses and function signatures
union U2 { f: ManuallyDrop<Box<dyn Iterator<Item: Copy>>> }
//~^ ERROR associated type bounds are not allowed within structs, enums, or unions
//~^ ERROR associated type bounds are only allowed in where clauses and function signatures
union U3 { f: ManuallyDrop<dyn Iterator<Item: 'static>> }
//~^ ERROR associated type bounds are not allowed within structs, enums, or unions
//~| ERROR the size for values of type `(dyn Iterator<Item = impl Sized + 'static> + 'static)`
//~^ ERROR associated type bounds are only allowed in where clauses and function signatures
fn main() {}

105
tests/ui/associated-type-bounds/inside-adt.stderr
View File

@ -1,131 +1,56 @@
error: associated type bounds are not allowed within structs, enums, or unions
error: associated type bounds are only allowed in where clauses and function signatures, not in field types
--> $DIR/inside-adt.rs:5:29
|
LL | struct S1 { f: dyn Iterator<Item: Copy> }
| ^^^^^^^^^^
error: associated type bounds are not allowed within structs, enums, or unions
error: associated type bounds are only allowed in where clauses and function signatures, not in field types
--> $DIR/inside-adt.rs:7:33
|
LL | struct S2 { f: Box<dyn Iterator<Item: Copy>> }
| ^^^^^^^^^^
error: associated type bounds are not allowed within structs, enums, or unions
error: associated type bounds are only allowed in where clauses and function signatures, not in field types
--> $DIR/inside-adt.rs:9:29
|
LL | struct S3 { f: dyn Iterator<Item: 'static> }
| ^^^^^^^^^^^^^
error: associated type bounds are not allowed within structs, enums, or unions
error: associated type bounds are only allowed in where clauses and function signatures, not in field types
--> $DIR/inside-adt.rs:12:26
|
LL | enum E1 { V(dyn Iterator<Item: Copy>) }
| ^^^^^^^^^^
error: associated type bounds are not allowed within structs, enums, or unions
--> $DIR/inside-adt.rs:15:30
error: associated type bounds are only allowed in where clauses and function signatures, not in field types
--> $DIR/inside-adt.rs:14:30
|
LL | enum E2 { V(Box<dyn Iterator<Item: Copy>>) }
| ^^^^^^^^^^
error: associated type bounds are not allowed within structs, enums, or unions
--> $DIR/inside-adt.rs:17:26
error: associated type bounds are only allowed in where clauses and function signatures, not in field types
--> $DIR/inside-adt.rs:16:26
|
LL | enum E3 { V(dyn Iterator<Item: 'static>) }
| ^^^^^^^^^^^^^
error: associated type bounds are not allowed within structs, enums, or unions
--> $DIR/inside-adt.rs:21:41
error: associated type bounds are only allowed in where clauses and function signatures, not in field types
--> $DIR/inside-adt.rs:19:41
|
LL | union U1 { f: ManuallyDrop<dyn Iterator<Item: Copy>> }
| ^^^^^^^^^^
error: associated type bounds are not allowed within structs, enums, or unions
--> $DIR/inside-adt.rs:24:45
error: associated type bounds are only allowed in where clauses and function signatures, not in field types
--> $DIR/inside-adt.rs:21:45
|
LL | union U2 { f: ManuallyDrop<Box<dyn Iterator<Item: Copy>>> }
| ^^^^^^^^^^
error: associated type bounds are not allowed within structs, enums, or unions
--> $DIR/inside-adt.rs:26:41
error: associated type bounds are only allowed in where clauses and function signatures, not in field types
--> $DIR/inside-adt.rs:23:41
|
LL | union U3 { f: ManuallyDrop<dyn Iterator<Item: 'static>> }
| ^^^^^^^^^^^^^
error[E0277]: the size for values of type `(dyn Iterator<Item = impl Copy> + 'static)` cannot be known at compilation time
--> $DIR/inside-adt.rs:12:13
|
LL | enum E1 { V(dyn Iterator<Item: Copy>) }
| ^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
= help: the trait `Sized` is not implemented for `(dyn Iterator<Item = impl Copy> + 'static)`
= note: no field of an enum variant may have a dynamically sized type
= help: change the field's type to have a statically known size
help: borrowed types always have a statically known size
|
LL | enum E1 { V(&dyn Iterator<Item: Copy>) }
| +
help: the `Box` type always has a statically known size and allocates its contents in the heap
|
LL | enum E1 { V(Box<dyn Iterator<Item: Copy>>) }
| ++++ +
error: aborting due to 9 previous errors
error[E0277]: the size for values of type `(dyn Iterator<Item = impl Sized + 'static> + 'static)` cannot be known at compilation time
--> $DIR/inside-adt.rs:17:13
|
LL | enum E3 { V(dyn Iterator<Item: 'static>) }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
= help: the trait `Sized` is not implemented for `(dyn Iterator<Item = impl Sized + 'static> + 'static)`
= note: no field of an enum variant may have a dynamically sized type
= help: change the field's type to have a statically known size
help: borrowed types always have a statically known size
|
LL | enum E3 { V(&dyn Iterator<Item: 'static>) }
| +
help: the `Box` type always has a statically known size and allocates its contents in the heap
|
LL | enum E3 { V(Box<dyn Iterator<Item: 'static>>) }
| ++++ +
error[E0277]: the size for values of type `(dyn Iterator<Item = impl Copy> + 'static)` cannot be known at compilation time
--> $DIR/inside-adt.rs:21:15
|
LL | union U1 { f: ManuallyDrop<dyn Iterator<Item: Copy>> }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
= help: within `ManuallyDrop<(dyn Iterator<Item = impl Copy> + 'static)>`, the trait `Sized` is not implemented for `(dyn Iterator<Item = impl Copy> + 'static)`
= note: required because it appears within the type `ManuallyDrop<dyn Iterator<Item = impl Copy>>`
= note: no field of a union may have a dynamically sized type
= help: change the field's type to have a statically known size
help: borrowed types always have a statically known size
|
LL | union U1 { f: &ManuallyDrop<dyn Iterator<Item: Copy>> }
| +
help: the `Box` type always has a statically known size and allocates its contents in the heap
|
LL | union U1 { f: Box<ManuallyDrop<dyn Iterator<Item: Copy>>> }
| ++++ +
error[E0277]: the size for values of type `(dyn Iterator<Item = impl Sized + 'static> + 'static)` cannot be known at compilation time
--> $DIR/inside-adt.rs:26:15
|
LL | union U3 { f: ManuallyDrop<dyn Iterator<Item: 'static>> }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
= help: within `ManuallyDrop<(dyn Iterator<Item = impl Sized + 'static> + 'static)>`, the trait `Sized` is not implemented for `(dyn Iterator<Item = impl Sized + 'static> + 'static)`
= note: required because it appears within the type `ManuallyDrop<dyn Iterator<Item = impl Sized>>`
= note: no field of a union may have a dynamically sized type
= help: change the field's type to have a statically known size
help: borrowed types always have a statically known size
|
LL | union U3 { f: &ManuallyDrop<dyn Iterator<Item: 'static>> }
| +
help: the `Box` type always has a statically known size and allocates its contents in the heap
|
LL | union U3 { f: Box<ManuallyDrop<dyn Iterator<Item: 'static>>> }
| ++++ +
error: aborting due to 13 previous errors
For more information about this error, try `rustc --explain E0277`.

2
tests/ui/async-await/in-trait/fn-not-async-err2.rs
View File

@ -11,7 +11,7 @@ trait MyTrait {
impl MyTrait for i32 {
fn foo(&self) -> impl Future<Output = i32> {
//~^ ERROR `impl Trait` only allowed in function and inherent method return types, not in `impl` method return [E0562]
//~^ ERROR `impl Trait` only allowed in function and inherent method return types, not in `impl` method return types
async { *self }
}
}

2
tests/ui/async-await/in-trait/fn-not-async-err2.stderr
View File

@ -1,4 +1,4 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `impl` method return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `impl` method return types
--> $DIR/fn-not-async-err2.rs:13:22
|
LL | fn foo(&self) -> impl Future<Output = i32> {

6
tests/ui/feature-gates/feature-gate-associated_type_bounds.stderr
View File

@ -115,19 +115,19 @@ LL | let _: impl Tr1<As1: Copy> = S1;
= note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
= help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in const type
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in const types
--> $DIR/feature-gate-associated_type_bounds.rs:55:14
|
LL | const _cdef: impl Tr1<As1: Copy> = S1;
| ^^^^^^^^^^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in const type
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in const types
--> $DIR/feature-gate-associated_type_bounds.rs:61:15
|
LL | static _sdef: impl Tr1<As1: Copy> = S1;
| ^^^^^^^^^^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable binding
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
--> $DIR/feature-gate-associated_type_bounds.rs:68:12
|
LL | let _: impl Tr1<As1: Copy> = S1;

4
tests/ui/feature-gates/feature-gate-impl_trait_in_fn_trait_return.stderr
View File

@ -1,4 +1,4 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return types
--> $DIR/feature-gate-impl_trait_in_fn_trait_return.rs:1:24
|
LL | fn f() -> impl Fn() -> impl Sized { || () }
@ -7,7 +7,7 @@ LL | fn f() -> impl Fn() -> impl Sized { || () }
= note: see issue #99697 <https://github.com/rust-lang/rust/issues/99697> for more information
= help: add `#![feature(impl_trait_in_fn_trait_return)]` to the crate attributes to enable
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return types
--> $DIR/feature-gate-impl_trait_in_fn_trait_return.rs:3:32
|
LL | fn g() -> &'static dyn Fn() -> impl Sized { &|| () }

6
tests/ui/feature-gates/feature-gate-return_position_impl_trait_in_trait.stderr
View File

@ -1,4 +1,4 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait method return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait method return types
--> $DIR/feature-gate-return_position_impl_trait_in_trait.rs:8:17
|
LL | fn bar() -> impl Sized;
@ -7,7 +7,7 @@ LL | fn bar() -> impl Sized;
= note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
= help: add `#![feature(return_position_impl_trait_in_trait)]` to the crate attributes to enable
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait method return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait method return types
--> $DIR/feature-gate-return_position_impl_trait_in_trait.rs:9:21
|
LL | fn baz() -> Box<impl std::fmt::Display>;
@ -16,7 +16,7 @@ LL | fn baz() -> Box<impl std::fmt::Display>;
= note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
= help: add `#![feature(return_position_impl_trait_in_trait)]` to the crate attributes to enable
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait method return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait method return types
--> $DIR/feature-gate-return_position_impl_trait_in_trait.rs:15:23
|
LL | async fn bar() -> impl Sized;

2
tests/ui/impl-trait/issues/issue-54600.stderr
View File

@ -1,4 +1,4 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable binding
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
--> $DIR/issue-54600.rs:4:19
|
LL | let x: Option<impl Debug> = Some(44_u32);

2
tests/ui/impl-trait/issues/issue-54840.stderr
View File

@ -1,4 +1,4 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable binding
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
--> $DIR/issue-54840.rs:5:13
|
LL | let j: &impl Add = &i;

2
tests/ui/impl-trait/issues/issue-58504.stderr
View File

@ -1,4 +1,4 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable binding
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
--> $DIR/issue-58504.rs:10:16
|
LL | let gens: [impl Generator<Return=!, Yield=()>;2] = [ mk_gen(), mk_gen() ];

4
tests/ui/impl-trait/issues/issue-58956.stderr
View File

@ -1,10 +1,10 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in const type
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in const types
--> $DIR/issue-58956.rs:7:11
|
LL | const _A: impl Lam = {
| ^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable binding
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
--> $DIR/issue-58956.rs:9:17
|
LL | let x: Wrap<impl Lam> = Wrap(B);

2
tests/ui/impl-trait/issues/issue-70971.stderr
View File

@ -1,4 +1,4 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable binding
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
--> $DIR/issue-70971.rs:2:14
|
LL | let x : (impl Copy,) = (true,);

2
tests/ui/impl-trait/issues/issue-79099.stderr
View File

@ -9,7 +9,7 @@ LL | let f: impl core::future::Future<Output = u8> = async { 1 };
= help: pass `--edition 2021` to `rustc`
= note: for more on editions, read https://doc.rust-lang.org/edition-guide
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable binding
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
--> $DIR/issue-79099.rs:3:16
|
LL | let f: impl core::future::Future<Output = u8> = async { 1 };

4
tests/ui/impl-trait/issues/issue-83929-impl-trait-in-generic-default.stderr
View File

@ -1,10 +1,10 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter default
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter defaults
--> $DIR/issue-83929-impl-trait-in-generic-default.rs:1:16
|
LL | struct Foo<T = impl Copy>(T);
| ^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter default
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter defaults
--> $DIR/issue-83929-impl-trait-in-generic-default.rs:4:20
|
LL | type Result<T, E = impl std::error::Error> = std::result::Result<T, E>;

2
tests/ui/impl-trait/issues/issue-84919.stderr
View File

@ -1,4 +1,4 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable binding
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
--> $DIR/issue-84919.rs:5:13
|
LL | let _x: impl Trait = ();

2
tests/ui/impl-trait/issues/issue-86642.stderr
View File

@ -1,4 +1,4 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in const type
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in const types
--> $DIR/issue-86642.rs:1:11
|
LL | static x: impl Fn(&str) -> Result<&str, ()> = move |source| {

2
tests/ui/impl-trait/issues/issue-87295.stderr
View File

@ -1,4 +1,4 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable binding
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
--> $DIR/issue-87295.rs:16:31
|
LL | let _do_not_waste: Struct<impl Trait<Output = i32>> = Struct::new(());

2
tests/ui/impl-trait/nested_impl_trait.stderr
View File

@ -34,7 +34,7 @@ LL | fn bad(x: impl Into<u32>) -> impl Into<impl Debug> { x }
| | nested `impl Trait` here
| outer `impl Trait`
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return types
--> $DIR/nested_impl_trait.rs:10:32
|
LL | fn bad_in_fn_syntax(x: fn() -> impl Into<impl Debug>) {}

78
tests/ui/impl-trait/where-allowed.stderr
View File

@ -43,109 +43,109 @@ LL | type InReturnInTypeAlias<R> = fn() -> impl Debug;
= note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
= help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer param
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer params
--> $DIR/where-allowed.rs:16:40
|
LL | fn in_fn_parameter_in_parameters(_: fn(impl Debug)) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return types
--> $DIR/where-allowed.rs:20:42
|
LL | fn in_fn_return_in_parameters(_: fn() -> impl Debug) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer param
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer params
--> $DIR/where-allowed.rs:24:38
|
LL | fn in_fn_parameter_in_return() -> fn(impl Debug) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return types
--> $DIR/where-allowed.rs:28:40
|
LL | fn in_fn_return_in_return() -> fn() -> impl Debug { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait param
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait params
--> $DIR/where-allowed.rs:32:49
|
LL | fn in_dyn_Fn_parameter_in_parameters(_: &dyn Fn(impl Debug)) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return types
--> $DIR/where-allowed.rs:36:51
|
LL | fn in_dyn_Fn_return_in_parameters(_: &dyn Fn() -> impl Debug) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait param
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait params
--> $DIR/where-allowed.rs:40:55
|
LL | fn in_dyn_Fn_parameter_in_return() -> &'static dyn Fn(impl Debug) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait param
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait params
--> $DIR/where-allowed.rs:47:51
|
LL | fn in_impl_Fn_parameter_in_parameters(_: &impl Fn(impl Debug)) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return types
--> $DIR/where-allowed.rs:52:53
|
LL | fn in_impl_Fn_return_in_parameters(_: &impl Fn() -> impl Debug) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait param
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait params
--> $DIR/where-allowed.rs:56:57
|
LL | fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait param
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait params
--> $DIR/where-allowed.rs:64:38
|
LL | fn in_Fn_parameter_in_generics<F: Fn(impl Debug)> (_: F) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return types
--> $DIR/where-allowed.rs:68:40
|
LL | fn in_Fn_return_in_generics<F: Fn() -> impl Debug> (_: F) { panic!() }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in field type
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in field types
--> $DIR/where-allowed.rs:81:32
|
LL | struct InBraceStructField { x: impl Debug }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in field type
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in field types
--> $DIR/where-allowed.rs:85:41
|
LL | struct InAdtInBraceStructField { x: Vec<impl Debug> }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in field type
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in field types
--> $DIR/where-allowed.rs:89:27
|
LL | struct InTupleStructField(impl Debug);
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in field type
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in field types
--> $DIR/where-allowed.rs:94:25
|
LL | InBraceVariant { x: impl Debug },
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in field type
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in field types
--> $DIR/where-allowed.rs:96:20
|
LL | InTupleVariant(impl Debug),
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait method return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait method return types
--> $DIR/where-allowed.rs:107:23
|
LL | fn in_return() -> impl Debug;
@ -154,7 +154,7 @@ LL | fn in_return() -> impl Debug;
= note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
= help: add `#![feature(return_position_impl_trait_in_trait)]` to the crate attributes to enable
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `impl` method return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `impl` method return types
--> $DIR/where-allowed.rs:124:34
|
LL | fn in_trait_impl_return() -> impl Debug { () }
@ -163,121 +163,121 @@ LL | fn in_trait_impl_return() -> impl Debug { () }
= note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
= help: add `#![feature(return_position_impl_trait_in_trait)]` to the crate attributes to enable
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `extern fn` param
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `extern fn` params
--> $DIR/where-allowed.rs:137:33
|
LL | fn in_foreign_parameters(_: impl Debug);
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `extern fn` return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `extern fn` return types
--> $DIR/where-allowed.rs:140:31
|
LL | fn in_foreign_return() -> impl Debug;
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return types
--> $DIR/where-allowed.rs:156:39
|
LL | type InReturnInTypeAlias<R> = fn() -> impl Debug;
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in traits
--> $DIR/where-allowed.rs:161:16
|
LL | impl PartialEq<impl Debug> for () {
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in impl header
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in impl headers
--> $DIR/where-allowed.rs:166:24
|
LL | impl PartialEq<()> for impl Debug {
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in impl header
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in impl headers
--> $DIR/where-allowed.rs:171:6
|
LL | impl impl Debug {
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in impl header
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in impl headers
--> $DIR/where-allowed.rs:177:24
|
LL | impl InInherentImplAdt<impl Debug> {
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in bound
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in bounds
--> $DIR/where-allowed.rs:183:11
|
LL | where impl Debug: Debug
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in bound
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in bounds
--> $DIR/where-allowed.rs:190:15
|
LL | where Vec<impl Debug>: Debug
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in bound
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in bounds
--> $DIR/where-allowed.rs:197:24
|
LL | where T: PartialEq<impl Debug>
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait param
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait params
--> $DIR/where-allowed.rs:204:17
|
LL | where T: Fn(impl Debug)
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return types
--> $DIR/where-allowed.rs:211:22
|
LL | where T: Fn() -> impl Debug
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter default
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter defaults
--> $DIR/where-allowed.rs:217:40
|
LL | struct InStructGenericParamDefault<T = impl Debug>(T);
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter default
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter defaults
--> $DIR/where-allowed.rs:221:36
|
LL | enum InEnumGenericParamDefault<T = impl Debug> { Variant(T) }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter default
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter defaults
--> $DIR/where-allowed.rs:225:38
|
LL | trait InTraitGenericParamDefault<T = impl Debug> {}
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter default
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter defaults
--> $DIR/where-allowed.rs:229:41
|
LL | type InTypeAliasGenericParamDefault<T = impl Debug> = T;
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter default
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter defaults
--> $DIR/where-allowed.rs:233:11
|
LL | impl <T = impl Debug> T {}
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter default
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter defaults
--> $DIR/where-allowed.rs:240:40
|
LL | fn in_method_generic_param_default<T = impl Debug>(_: T) {}
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable binding
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
--> $DIR/where-allowed.rs:246:29
|
LL | let _in_local_variable: impl Fn() = || {};
| ^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in closure return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in closure return types
--> $DIR/where-allowed.rs:248:46
|
LL | let _in_return_in_local_variable = || -> impl Fn() { || {} };

8
tests/ui/issues/issue-47715.stderr
View File

@ -1,22 +1,22 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generics
--> $DIR/issue-47715.rs:9:37
|
LL | struct Container<T: Iterable<Item = impl Foo>> {
| ^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generics
--> $DIR/issue-47715.rs:14:30
|
LL | enum Enum<T: Iterable<Item = impl Foo>> {
| ^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generics
--> $DIR/issue-47715.rs:19:32
|
LL | union Union<T: Iterable<Item = impl Foo> + Copy> {
| ^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generics
--> $DIR/issue-47715.rs:24:30
|
LL | type Type<T: Iterable<Item = impl Foo>> = T;

2
tests/ui/type-alias-impl-trait/type-alias-impl-trait-fn-type.stderr
View File

@ -1,4 +1,4 @@
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return types
--> $DIR/type-alias-impl-trait-fn-type.rs:6:20
|
LL | type Foo = fn() -> impl Send;

2
tests/ui/typeck/issue-104513-ice.stderr
View File

@ -4,7 +4,7 @@ error[E0405]: cannot find trait `Oops` in this scope
LL | let _: S<impl Oops> = S;
| ^^^^ not found in this scope
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable binding
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
--> $DIR/issue-104513-ice.rs:3:14
|
LL | let _: S<impl Oops> = S;