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Auto merge of #117817 - fmease:deny-more-tilde-const, r=fee1-dead

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Deny more `~const` trait bounds

thereby fixing a family of ICEs (delayed bugs) for `feature(const_trait_impl, effects)` code.

As discussed
r? `@fee1-dead`
This commit is contained in:
bors 2023-11-12 04:40:44 +00:00
commit a04d56b36d
25 changed files with 444 additions and 134 deletions
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5
compiler/rustc_ast_passes/messages.ftl
View File

@ -218,9 +218,12 @@ ast_passes_static_without_body =
.suggestion = provide a definition for the static
ast_passes_tilde_const_disallowed = `~const` is not allowed here
.trait = trait objects cannot have `~const` trait bounds
.closure = closures cannot have `~const` trait bounds
.function = this function is not `const`, so it cannot have `~const` trait bounds
.trait = this trait is not a `#[const_trait]`, so it cannot have `~const` trait bounds
.impl = this impl is not `const`, so it cannot have `~const` trait bounds
.object = trait objects cannot have `~const` trait bounds
.item = this item cannot have `~const` trait bounds
ast_passes_trait_fn_const =
functions in traits cannot be declared const

75
compiler/rustc_ast_passes/src/ast_validation.rs
View File

@ -40,6 +40,9 @@ enum SelfSemantic {
enum DisallowTildeConstContext<'a> {
TraitObject,
Fn(FnKind<'a>),
Trait(Span),
Impl(Span),
Item,
}
struct AstValidator<'a> {
@ -110,18 +113,6 @@ fn with_tilde_const(
self.disallow_tilde_const = old;
}
fn with_tilde_const_allowed(&mut self, f: impl FnOnce(&mut Self)) {
self.with_tilde_const(None, f)
}
fn with_banned_tilde_const(
&mut self,
ctx: DisallowTildeConstContext<'a>,
f: impl FnOnce(&mut Self),
) {
self.with_tilde_const(Some(ctx), f)
}
fn check_type_alias_where_clause_location(
&mut self,
ty_alias: &TyAlias,
@ -173,7 +164,7 @@ fn walk_ty(&mut self, t: &'a Ty) {
self.with_impl_trait(Some(t.span), |this| visit::walk_ty(this, t))
}
TyKind::TraitObject(..) => self
.with_banned_tilde_const(DisallowTildeConstContext::TraitObject, |this| {
.with_tilde_const(Some(DisallowTildeConstContext::TraitObject), |this| {
visit::walk_ty(this, t)
}),
TyKind::Path(qself, path) => {
@ -845,11 +836,9 @@ fn visit_item(&mut self, item: &'a Item) {
this.visit_vis(&item.vis);
this.visit_ident(item.ident);
if let Const::Yes(_) = constness {
this.with_tilde_const_allowed(|this| this.visit_generics(generics));
} else {
this.visit_generics(generics);
}
let disallowed = matches!(constness, Const::No)
.then(|| DisallowTildeConstContext::Impl(item.span));
this.with_tilde_const(disallowed, |this| this.visit_generics(generics));
this.visit_trait_ref(t);
this.visit_ty(self_ty);
@ -863,10 +852,10 @@ fn visit_item(&mut self, item: &'a Item) {
polarity,
defaultness,
constness,
generics: _,
generics,
of_trait: None,
self_ty,
items: _,
items,
}) => {
let error =
|annotation_span, annotation, only_trait: bool| errors::InherentImplCannot {
@ -898,6 +887,14 @@ fn visit_item(&mut self, item: &'a Item) {
if let &Const::Yes(span) = constness {
self.err_handler().emit_err(error(span, "`const`", true));
}
self.visit_vis(&item.vis);
self.visit_ident(item.ident);
self.with_tilde_const(None, |this| this.visit_generics(generics));
self.visit_ty(self_ty);
walk_list!(self, visit_assoc_item, items, AssocCtxt::Impl);
walk_list!(self, visit_attribute, &item.attrs);
return; // Avoid visiting again.
}
ItemKind::Fn(box Fn { defaultness, sig, generics, body }) => {
self.check_defaultness(item.span, *defaultness);
@ -978,8 +975,10 @@ fn visit_item(&mut self, item: &'a Item) {
// context for the supertraits.
this.visit_vis(&item.vis);
this.visit_ident(item.ident);
this.visit_generics(generics);
this.with_tilde_const_allowed(|this| {
let disallowed =
(!is_const_trait).then(|| DisallowTildeConstContext::Trait(item.span));
this.with_tilde_const(disallowed, |this| {
this.visit_generics(generics);
walk_list!(this, visit_param_bound, bounds, BoundKind::SuperTraits)
});
walk_list!(this, visit_assoc_item, items, AssocCtxt::Trait);
@ -999,16 +998,11 @@ fn visit_item(&mut self, item: &'a Item) {
}
}
ItemKind::Struct(vdata, generics) => match vdata {
// Duplicating the `Visitor` logic allows catching all cases
// of `Anonymous(Struct, Union)` outside of a field struct or union.
//
// Inside `visit_ty` the validator catches every `Anonymous(Struct, Union)` it
// encounters, and only on `ItemKind::Struct` and `ItemKind::Union`
// it uses `visit_ty_common`, which doesn't contain that specific check.
VariantData::Struct(fields, ..) => {
self.visit_vis(&item.vis);
self.visit_ident(item.ident);
self.visit_generics(generics);
// Permit `Anon{Struct,Union}` as field type.
walk_list!(self, visit_struct_field_def, fields);
walk_list!(self, visit_attribute, &item.attrs);
return;
@ -1024,6 +1018,7 @@ fn visit_item(&mut self, item: &'a Item) {
self.visit_vis(&item.vis);
self.visit_ident(item.ident);
self.visit_generics(generics);
// Permit `Anon{Struct,Union}` as field type.
walk_list!(self, visit_struct_field_def, fields);
walk_list!(self, visit_attribute, &item.attrs);
return;
@ -1212,15 +1207,18 @@ fn visit_param_bound(&mut self, bound: &'a GenericBound, ctxt: BoundKind) {
if let Some(reason) = &self.disallow_tilde_const =>
{
let reason = match reason {
DisallowTildeConstContext::TraitObject => {
errors::TildeConstReason::TraitObject
}
DisallowTildeConstContext::Fn(FnKind::Closure(..)) => {
errors::TildeConstReason::Closure
}
DisallowTildeConstContext::Fn(FnKind::Fn(_, ident, ..)) => {
errors::TildeConstReason::Function { ident: ident.span }
}
&DisallowTildeConstContext::Trait(span) => errors::TildeConstReason::Trait { span },
&DisallowTildeConstContext::Impl(span) => errors::TildeConstReason::Impl { span },
DisallowTildeConstContext::TraitObject => {
errors::TildeConstReason::TraitObject
}
DisallowTildeConstContext::Item => errors::TildeConstReason::Item,
};
self.err_handler()
.emit_err(errors::TildeConstDisallowed { span: bound.span(), reason });
@ -1328,7 +1326,6 @@ fn visit_fn(&mut self, fk: FnKind<'a>, span: Span, id: NodeId) {
|| matches!(fk.ctxt(), Some(FnCtxt::Assoc(_)) if self.in_const_trait_or_impl);
let disallowed = (!tilde_const_allowed).then(|| DisallowTildeConstContext::Fn(fk));
self.with_tilde_const(disallowed, |this| visit::walk_fn(this, fk));
}
@ -1397,18 +1394,6 @@ fn visit_assoc_item(&mut self, item: &'a AssocItem, ctxt: AssocCtxt) {
}
match &item.kind {
AssocItemKind::Type(box TyAlias { generics, bounds, ty, .. })
if ctxt == AssocCtxt::Trait =>
{
self.visit_vis(&item.vis);
self.visit_ident(item.ident);
walk_list!(self, visit_attribute, &item.attrs);
self.with_tilde_const_allowed(|this| {
this.visit_generics(generics);
walk_list!(this, visit_param_bound, bounds, BoundKind::Bound);
});
walk_list!(self, visit_ty, ty);
}
AssocItemKind::Fn(box Fn { sig, generics, body, .. })
if self.in_const_trait_or_impl
|| ctxt == AssocCtxt::Trait
@ -1552,7 +1537,7 @@ pub fn check_crate(
in_const_trait_or_impl: false,
has_proc_macro_decls: false,
outer_impl_trait: None,
disallow_tilde_const: None,
disallow_tilde_const: Some(DisallowTildeConstContext::Item),
is_impl_trait_banned: false,
lint_buffer: lints,
};

16
compiler/rustc_ast_passes/src/errors.rs
View File

@ -551,8 +551,6 @@ pub struct TildeConstDisallowed {
#[derive(Subdiagnostic)]
pub enum TildeConstReason {
#[note(ast_passes_trait)]
TraitObject,
#[note(ast_passes_closure)]
Closure,
#[note(ast_passes_function)]
@ -560,6 +558,20 @@ pub enum TildeConstReason {
#[primary_span]
ident: Span,
},
#[note(ast_passes_trait)]
Trait {
#[primary_span]
span: Span,
},
#[note(ast_passes_impl)]
Impl {
#[primary_span]
span: Span,
},
#[note(ast_passes_object)]
TraitObject,
#[note(ast_passes_item)]
Item,
}
#[derive(Diagnostic)]

4
tests/ui/generic-const-items/const-trait-impl.rs
View File

@ -7,8 +7,8 @@
#![allow(incomplete_features)]
#![crate_type = "lib"]
// FIXME(generic_const_items): Interpret `~const` as always-const.
const CREATE<T: ~const Create>: T = T::create();
// FIXME(generic_const_items, effects): Introduce `const` bounds to make this work.
const CREATE<T: Create>: T = T::create();
pub const K0: i32 = CREATE::<i32>;
pub const K1: i32 = CREATE; // arg inferred

6
tests/ui/generic-const-items/const-trait-impl.stderr
View File

@ -1,8 +1,8 @@
error[E0015]: cannot call non-const fn `<T as Create>::create` in constants
--> $DIR/const-trait-impl.rs:11:37
--> $DIR/const-trait-impl.rs:11:30
|
LL | const CREATE<T: ~const Create>: T = T::create();
| ^^^^^^^^^^^
LL | const CREATE<T: Create>: T = T::create();
| ^^^^^^^^^^^
|
= note: calls in constants are limited to constant functions, tuple structs and tuple variants

10
tests/ui/rfcs/rfc-2632-const-trait-impl/assoc-type-const-bound-usage.stderr
View File

@ -1,3 +1,11 @@
error: `~const` is not allowed here
--> $DIR/assoc-type-const-bound-usage.rs:7:17
|
LL | type Assoc: ~const Foo;
| ^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error[E0308]: mismatched types
--> $DIR/assoc-type-const-bound-usage.rs:12:5
|
@ -7,6 +15,6 @@ LL | <T as Foo>::Assoc::foo();
= note: expected constant `host`
found constant `true`
error: aborting due to previous error
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0308`.

10
tests/ui/rfcs/rfc-2632-const-trait-impl/assoc-type.stderr
View File

@ -1,8 +1,16 @@
error: `~const` is not allowed here
--> $DIR/assoc-type.rs:17:15
|
LL | type Bar: ~const std::ops::Add;
| ^^^^^^^^^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: ~const can only be applied to `#[const_trait]` traits
--> $DIR/assoc-type.rs:17:22
|
LL | type Bar: ~const std::ops::Add;
| ^^^^^^^^^^^^^
error: aborting due to previous error
error: aborting due to 2 previous errors

2
tests/ui/rfcs/rfc-2632-const-trait-impl/effects/const-bound-on-not-const-associated-fn.rs → tests/ui/rfcs/rfc-2632-const-trait-impl/const-bound-on-not-const-associated-fn.rs
View File

@ -1,4 +1,4 @@
#![feature(const_trait_impl, effects)]
#![feature(const_trait_impl)]
#[const_trait]
trait MyTrait {

0
tests/ui/rfcs/rfc-2632-const-trait-impl/effects/const-bound-on-not-const-associated-fn.stderr → tests/ui/rfcs/rfc-2632-const-trait-impl/const-bound-on-not-const-associated-fn.stderr
View File

21
tests/ui/rfcs/rfc-2632-const-trait-impl/const-drop.precise.stderr
View File

@ -1,19 +1,10 @@
error[E0493]: destructor of `T` cannot be evaluated at compile-time
--> $DIR/const-drop.rs:19:32
error: `~const` is not allowed here
--> $DIR/const-drop.rs:67:38
|
LL | const fn a<T: ~const Destruct>(_: T) {}
| ^ - value is dropped here
| |
| the destructor for this type cannot be evaluated in constant functions
error[E0493]: destructor of `S<'_>` cannot be evaluated at compile-time
--> $DIR/const-drop.rs:24:13
LL | pub struct ConstDropWithBound<T: ~const SomeTrait>(pub core::marker::PhantomData<T>);
| ^^^^^^^^^^^^^^^^
|
LL | let _ = S(&mut c);
| ^^^^^^^^^- value is dropped here
| |
| the destructor for this type cannot be evaluated in constant functions
= note: this item cannot have `~const` trait bounds
error: aborting due to 2 previous errors
error: aborting due to previous error
For more information about this error, try `rustc --explain E0493`.

1
tests/ui/rfcs/rfc-2632-const-trait-impl/const-drop.rs
View File

@ -63,6 +63,7 @@ impl SomeTrait for i32 {
fn foo() {}
}
// FIXME(effects): This should be a `const` bound instead of a `~const` one.
pub struct ConstDropWithBound<T: ~const SomeTrait>(pub core::marker::PhantomData<T>);
impl<T: ~const SomeTrait> const Drop for ConstDropWithBound<T> {

21
tests/ui/rfcs/rfc-2632-const-trait-impl/const-drop.stock.stderr
View File

@ -1,19 +1,10 @@
error[E0493]: destructor of `T` cannot be evaluated at compile-time
--> $DIR/const-drop.rs:19:32
error: `~const` is not allowed here
--> $DIR/const-drop.rs:67:38
|
LL | const fn a<T: ~const Destruct>(_: T) {}
| ^ - value is dropped here
| |
| the destructor for this type cannot be evaluated in constant functions
error[E0493]: destructor of `S<'_>` cannot be evaluated at compile-time
--> $DIR/const-drop.rs:24:13
LL | pub struct ConstDropWithBound<T: ~const SomeTrait>(pub core::marker::PhantomData<T>);
| ^^^^^^^^^^^^^^^^
|
LL | let _ = S(&mut c);
| ^^^^^^^^^- value is dropped here
| |
| the destructor for this type cannot be evaluated in constant functions
= note: this item cannot have `~const` trait bounds
error: aborting due to 2 previous errors
error: aborting due to previous error
For more information about this error, try `rustc --explain E0493`.

9
tests/ui/rfcs/rfc-2632-const-trait-impl/issue-90052.rs
View File

@ -1,9 +0,0 @@
#![feature(const_trait_impl)]
#[const_trait]
trait Bar {}
fn foo<T>() where T: ~const Bar {}
//~^ ERROR `~const` is not allowed
fn main() {}

14
tests/ui/rfcs/rfc-2632-const-trait-impl/issue-90052.stderr
View File

@ -1,14 +0,0 @@
error: `~const` is not allowed here
--> $DIR/issue-90052.rs:6:22
|
LL | fn foo<T>() where T: ~const Bar {}
| ^^^^^^^^^^
|
note: this function is not `const`, so it cannot have `~const` trait bounds
--> $DIR/issue-90052.rs:6:4
|
LL | fn foo<T>() where T: ~const Bar {}
| ^^^
error: aborting due to previous error

6
tests/ui/rfcs/rfc-2632-const-trait-impl/specialization/const-default-bound-non-const-specialized-bound.rs
View File

@ -18,11 +18,7 @@ trait Bar {
fn bar();
}
// bgr360: I was only able to exercise the code path that raises the
// "missing ~const qualifier" error by making this base impl non-const, even
// though that doesn't really make sense to do. As seen below, if the base impl
// is made const, rustc fails earlier with an overlapping impl failure.
impl<T> Bar for T
impl<T> const Bar for T
where
T: ~const Foo,
{

14
tests/ui/rfcs/rfc-2632-const-trait-impl/super-traits-fail-2.nn.stderr
View File

@ -1,3 +1,15 @@
error: `~const` is not allowed here
--> $DIR/super-traits-fail-2.rs:11:12
|
LL | trait Bar: ~const Foo {}
| ^^^^^^^^^^
|
note: this trait is not a `#[const_trait]`, so it cannot have `~const` trait bounds
--> $DIR/super-traits-fail-2.rs:11:1
|
LL | trait Bar: ~const Foo {}
| ^^^^^^^^^^^^^^^^^^^^^^^^
error: ~const can only be applied to `#[const_trait]` traits
--> $DIR/super-traits-fail-2.rs:11:19
|
@ -12,5 +24,5 @@ LL | trait Bar: ~const Foo {}
|
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: aborting due to 2 previous errors
error: aborting due to 3 previous errors

15
tests/ui/rfcs/rfc-2632-const-trait-impl/super-traits-fail-2.yn.stderr
View File

@ -1,11 +1,14 @@
error[E0015]: cannot call non-const fn `<T as Foo>::a` in constant functions
--> $DIR/super-traits-fail-2.rs:16:7
error: `~const` is not allowed here
--> $DIR/super-traits-fail-2.rs:11:12
|
LL | x.a();
| ^^^
LL | trait Bar: ~const Foo {}
| ^^^^^^^^^^
|
= note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
note: this trait is not a `#[const_trait]`, so it cannot have `~const` trait bounds
--> $DIR/super-traits-fail-2.rs:11:1
|
LL | trait Bar: ~const Foo {}
| ^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error
For more information about this error, try `rustc --explain E0015`.

16
tests/ui/rfcs/rfc-2632-const-trait-impl/super-traits-fail-3.nn.stderr
View File

@ -1,3 +1,15 @@
error: `~const` is not allowed here
--> $DIR/super-traits-fail-3.rs:13:12
|
LL | trait Bar: ~const Foo {}
| ^^^^^^^^^^
|
note: this trait is not a `#[const_trait]`, so it cannot have `~const` trait bounds
--> $DIR/super-traits-fail-3.rs:13:1
|
LL | trait Bar: ~const Foo {}
| ^^^^^^^^^^^^^^^^^^^^^^^^
error: ~const can only be applied to `#[const_trait]` traits
--> $DIR/super-traits-fail-3.rs:13:19
|
@ -13,10 +25,10 @@ LL | trait Bar: ~const Foo {}
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error: ~const can only be applied to `#[const_trait]` traits
--> $DIR/super-traits-fail-3.rs:17:24
--> $DIR/super-traits-fail-3.rs:18:24
|
LL | const fn foo<T: ~const Bar>(x: &T) {
| ^^^
error: aborting due to 3 previous errors
error: aborting due to 4 previous errors

1
tests/ui/rfcs/rfc-2632-const-trait-impl/super-traits-fail-3.rs
View File

@ -13,6 +13,7 @@ trait Foo {
trait Bar: ~const Foo {}
//[ny,nn]~^ ERROR: ~const can only be applied to `#[const_trait]`
//[ny,nn]~| ERROR: ~const can only be applied to `#[const_trait]`
//[yn,nn]~^^^ ERROR: `~const` is not allowed here
const fn foo<T: ~const Bar>(x: &T) {
//[yn,nn]~^ ERROR: ~const can only be applied to `#[const_trait]`

16
tests/ui/rfcs/rfc-2632-const-trait-impl/super-traits-fail-3.yn.stderr
View File

@ -1,8 +1,20 @@
error: `~const` is not allowed here
--> $DIR/super-traits-fail-3.rs:13:12
|
LL | trait Bar: ~const Foo {}
| ^^^^^^^^^^
|
note: this trait is not a `#[const_trait]`, so it cannot have `~const` trait bounds
--> $DIR/super-traits-fail-3.rs:13:1
|
LL | trait Bar: ~const Foo {}
| ^^^^^^^^^^^^^^^^^^^^^^^^
error: ~const can only be applied to `#[const_trait]` traits
--> $DIR/super-traits-fail-3.rs:17:24
--> $DIR/super-traits-fail-3.rs:18:24
|
LL | const fn foo<T: ~const Bar>(x: &T) {
| ^^^
error: aborting due to previous error
error: aborting due to 2 previous errors

2
tests/ui/rfcs/rfc-2632-const-trait-impl/super-traits-fail-3.yy.stderr
View File

@ -1,5 +1,5 @@
error[E0015]: cannot call non-const fn `<T as Foo>::a` in constant functions
--> $DIR/super-traits-fail-3.rs:19:7
--> $DIR/super-traits-fail-3.rs:20:7
|
LL | x.a();
| ^^^

54
tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-invalid-places.rs
View File

@ -1,7 +1,55 @@
#![feature(const_trait_impl)]
#![feature(associated_type_bounds)]
struct TildeQuestion<T: ~const ?Sized>(std::marker::PhantomData<T>);
//~^ ERROR `~const` and `?` are mutually exclusive
#[const_trait]
trait Trait {}
// Regression test for issue #90052.
fn non_const_function<T: ~const Trait>() {} //~ ERROR `~const` is not allowed
struct Struct<T: ~const Trait> { field: T } //~ ERROR `~const` is not allowed here
struct TupleStruct<T: ~const Trait>(T); //~ ERROR `~const` is not allowed here
struct UnitStruct<T: ~const Trait>; //~ ERROR `~const` is not allowed here
enum Enum<T: ~const Trait> { Variant(T) } //~ ERROR `~const` is not allowed here
union Union<T: ~const Trait> { field: T } //~ ERROR `~const` is not allowed here
type Type<T: ~const Trait> = T; //~ ERROR `~const` is not allowed here
const CONSTANT<T: ~const Trait>: () = (); //~ ERROR `~const` is not allowed here
//~^ ERROR generic const items are experimental
trait NonConstTrait {
type Type<T: ~const Trait>: ~const Trait;
//~^ ERROR `~const` is not allowed
//~| ERROR `~const` is not allowed
fn non_const_function<T: ~const Trait>(); //~ ERROR `~const` is not allowed
const CONSTANT<T: ~const Trait>: (); //~ ERROR `~const` is not allowed
//~^ ERROR generic const items are experimental
}
impl NonConstTrait for () {
type Type<T: ~const Trait> = (); //~ ERROR `~const` is not allowed
fn non_const_function<T: ~const Trait>() {} //~ ERROR `~const` is not allowed
const CONSTANT<T: ~const Trait>: () = (); //~ ERROR `~const` is not allowed
//~^ ERROR generic const items are experimental
}
struct Implementor;
impl Implementor {
type Type<T: ~const Trait> = (); //~ ERROR `~const` is not allowed
//~^ ERROR inherent associated types are unstable
fn non_const_function<T: ~const Trait>() {} //~ ERROR `~const` is not allowed
const CONSTANT<T: ~const Trait>: () = (); //~ ERROR `~const` is not allowed
//~^ ERROR generic const items are experimental
}
// non-const traits
trait Child0: ~const Trait {} //~ ERROR `~const` is not allowed
trait Child1 where Self: ~const Trait {} //~ ERROR `~const` is not allowed
// non-const impl
impl<T: ~const Trait> Trait for T {} //~ ERROR `~const` is not allowed
fn main() {}

246
tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-invalid-places.stderr
View File

@ -1,8 +1,244 @@
error: `~const` and `?` are mutually exclusive
--> $DIR/tilde-const-invalid-places.rs:4:25
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:7:26
|
LL | struct TildeQuestion<T: ~const ?Sized>(std::marker::PhantomData<T>);
| ^^^^^^^^^^^^^
LL | fn non_const_function<T: ~const Trait>() {}
| ^^^^^^^^^^^^
|
note: this function is not `const`, so it cannot have `~const` trait bounds
--> $DIR/tilde-const-invalid-places.rs:7:4
|
LL | fn non_const_function<T: ~const Trait>() {}
| ^^^^^^^^^^^^^^^^^^
error: aborting due to previous error
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:9:18
|
LL | struct Struct<T: ~const Trait> { field: T }
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:10:23
|
LL | struct TupleStruct<T: ~const Trait>(T);
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:11:22
|
LL | struct UnitStruct<T: ~const Trait>;
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:13:14
|
LL | enum Enum<T: ~const Trait> { Variant(T) }
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:15:16
|
LL | union Union<T: ~const Trait> { field: T }
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:17:14
|
LL | type Type<T: ~const Trait> = T;
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:19:19
|
LL | const CONSTANT<T: ~const Trait>: () = ();
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:23:18
|
LL | type Type<T: ~const Trait>: ~const Trait;
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:23:33
|
LL | type Type<T: ~const Trait>: ~const Trait;
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:26:30
|
LL | fn non_const_function<T: ~const Trait>();
| ^^^^^^^^^^^^
|
note: this function is not `const`, so it cannot have `~const` trait bounds
--> $DIR/tilde-const-invalid-places.rs:26:8
|
LL | fn non_const_function<T: ~const Trait>();
| ^^^^^^^^^^^^^^^^^^
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:27:23
|
LL | const CONSTANT<T: ~const Trait>: ();
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:32:18
|
LL | type Type<T: ~const Trait> = ();
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:33:30
|
LL | fn non_const_function<T: ~const Trait>() {}
| ^^^^^^^^^^^^
|
note: this function is not `const`, so it cannot have `~const` trait bounds
--> $DIR/tilde-const-invalid-places.rs:33:8
|
LL | fn non_const_function<T: ~const Trait>() {}
| ^^^^^^^^^^^^^^^^^^
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:34:23
|
LL | const CONSTANT<T: ~const Trait>: () = ();
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:41:18
|
LL | type Type<T: ~const Trait> = ();
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:43:30
|
LL | fn non_const_function<T: ~const Trait>() {}
| ^^^^^^^^^^^^
|
note: this function is not `const`, so it cannot have `~const` trait bounds
--> $DIR/tilde-const-invalid-places.rs:43:8
|
LL | fn non_const_function<T: ~const Trait>() {}
| ^^^^^^^^^^^^^^^^^^
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:44:23
|
LL | const CONSTANT<T: ~const Trait>: () = ();
| ^^^^^^^^^^^^
|
= note: this item cannot have `~const` trait bounds
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:49:15
|
LL | trait Child0: ~const Trait {}
| ^^^^^^^^^^^^
|
note: this trait is not a `#[const_trait]`, so it cannot have `~const` trait bounds
--> $DIR/tilde-const-invalid-places.rs:49:1
|
LL | trait Child0: ~const Trait {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:50:26
|
LL | trait Child1 where Self: ~const Trait {}
| ^^^^^^^^^^^^
|
note: this trait is not a `#[const_trait]`, so it cannot have `~const` trait bounds
--> $DIR/tilde-const-invalid-places.rs:50:1
|
LL | trait Child1 where Self: ~const Trait {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: `~const` is not allowed here
--> $DIR/tilde-const-invalid-places.rs:53:9
|
LL | impl<T: ~const Trait> Trait for T {}
| ^^^^^^^^^^^^
|
note: this impl is not `const`, so it cannot have `~const` trait bounds
--> $DIR/tilde-const-invalid-places.rs:53:1
|
LL | impl<T: ~const Trait> Trait for T {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0658]: generic const items are experimental
--> $DIR/tilde-const-invalid-places.rs:19:15
|
LL | const CONSTANT<T: ~const Trait>: () = ();
| ^^^^^^^^^^^^^^^^^
|
= note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
= help: add `#![feature(generic_const_items)]` to the crate attributes to enable
error[E0658]: generic const items are experimental
--> $DIR/tilde-const-invalid-places.rs:27:19
|
LL | const CONSTANT<T: ~const Trait>: ();
| ^^^^^^^^^^^^^^^^^
|
= note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
= help: add `#![feature(generic_const_items)]` to the crate attributes to enable
error[E0658]: generic const items are experimental
--> $DIR/tilde-const-invalid-places.rs:34:19
|
LL | const CONSTANT<T: ~const Trait>: () = ();
| ^^^^^^^^^^^^^^^^^
|
= note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
= help: add `#![feature(generic_const_items)]` to the crate attributes to enable
error[E0658]: generic const items are experimental
--> $DIR/tilde-const-invalid-places.rs:44:19
|
LL | const CONSTANT<T: ~const Trait>: () = ();
| ^^^^^^^^^^^^^^^^^
|
= note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
= help: add `#![feature(generic_const_items)]` to the crate attributes to enable
error[E0658]: inherent associated types are unstable
--> $DIR/tilde-const-invalid-places.rs:41:5
|
LL | type Type<T: ~const Trait> = ();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
= help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
error: aborting due to 26 previous errors
For more information about this error, try `rustc --explain E0658`.

6
tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-maybe-trait.rs Normal file
View File

@ -0,0 +1,6 @@
#![feature(const_trait_impl)]
const fn tilde_question<T: ~const ?Sized>() {}
//~^ ERROR `~const` and `?` are mutually exclusive
fn main() {}

8
tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-maybe-trait.stderr Normal file
View File

@ -0,0 +1,8 @@
error: `~const` and `?` are mutually exclusive
--> $DIR/tilde-const-maybe-trait.rs:3:28
|
LL | const fn tilde_question<T: ~const ?Sized>() {}
| ^^^^^^^^^^^^^
error: aborting due to previous error