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Provide more context on derived obligation error primary label
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Expand the primary span of E0277 when the immediate unmet bound is not what the user wrote:

```
error[E0277]: the trait bound `i32: Bar` is not satisfied
 --> f100.rs:6:6
  |
6 |     <i32 as Foo>::foo();
  |      ^^^ the trait `Bar` is not implemented for `i32`, which is required by `i32: Foo`
  |
help: this trait has no implementations, consider adding one
 --> f100.rs:2:1
  |
2 | trait Bar {}
  | ^^^^^^^^^
note: required for `i32` to implement `Foo`
 --> f100.rs:3:14
  |
3 | impl<T: Bar> Foo for T {}
  |         ---  ^^^     ^
  |         |
  |         unsatisfied trait bound introduced here
```

Fix #40120.
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@estebank
estebank committed Jan 29, 2024
1 parent 6351247 commit 19728a9
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Showing 196 changed files with 382 additions and 373 deletions.
41 changes: 25 additions & 16 deletions compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1432,20 +1432,18 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
) -> bool {
let span = obligation.cause.span;

let code = if let ObligationCauseCode::FunctionArgumentObligation { parent_code, .. } =
obligation.cause.code()
{
parent_code
} else if let ObligationCauseCode::ItemObligation(_)
| ObligationCauseCode::ExprItemObligation(..) = obligation.cause.code()
{
obligation.cause.code()
} else if let ExpnKind::Desugaring(DesugaringKind::ForLoop) =
span.ctxt().outer_expn_data().kind
{
obligation.cause.code()
} else {
return false;
let code = match obligation.cause.code() {
ObligationCauseCode::FunctionArgumentObligation { parent_code, .. } => parent_code,
c @ ObligationCauseCode::ItemObligation(_)
| c @ ObligationCauseCode::ExprItemObligation(..) => c,
c if matches!(
span.ctxt().outer_expn_data().kind,
ExpnKind::Desugaring(DesugaringKind::ForLoop)
) =>
{
c
}
_ => return false,
};

// List of traits for which it would be nonsensical to suggest borrowing.
Expand Down Expand Up @@ -4978,16 +4976,27 @@ pub(super) fn get_explanation_based_on_obligation<'tcx>(
_ => None,
};

let pred = obligation.predicate;
let (_, base) = obligation.cause.code().peel_derives_with_predicate();
let post = if let ty::PredicateKind::Clause(clause) = pred.kind().skip_binder()
&& let ty::ClauseKind::Trait(pred) = clause
&& let Some(base) = base
&& base.skip_binder() != pred
{
format!(", which is required by `{base}`")
} else {
String::new()
};
match ty_desc {
Some(desc) => format!(
"{}the trait `{}` is not implemented for {} `{}`",
"{}the trait `{}` is not implemented for {} `{}`{post}",
pre_message,
trait_predicate.print_modifiers_and_trait_path(),
desc,
tcx.short_ty_string(trait_ref.skip_binder().self_ty(), &mut None),
),
None => format!(
"{}the trait `{}` is not implemented for `{}`",
"{}the trait `{}` is not implemented for `{}`{post}",
pre_message,
trait_predicate.print_modifiers_and_trait_path(),
tcx.short_ty_string(trait_ref.skip_binder().self_ty(), &mut None),
Expand Down
2 changes: 1 addition & 1 deletion tests/ui/associated-consts/issue-58022.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ error[E0277]: the size for values of type `[u8]` cannot be known at compilation
LL | fn new(slice: &[u8; Self::SIZE]) -> Self {
| ^^^^ doesn't have a size known at compile-time
|
= help: within `Bar<[u8]>`, the trait `Sized` is not implemented for `[u8]`
= help: within `Bar<[u8]>`, the trait `Sized` is not implemented for `[u8]`, which is required by `Bar<[u8]>: Sized`
note: required because it appears within the type `Bar<[u8]>`
--> $DIR/issue-58022.rs:8:12
|
Expand Down
2 changes: 1 addition & 1 deletion tests/ui/associated-type-bounds/return-type-notation/basic.without.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ error: future cannot be sent between threads safely
LL | is_send(foo::<T>());
| ^^^^^^^^^^ future returned by `foo` is not `Send`
|
= help: within `impl Future<Output = Result<(), ()>>`, the trait `Send` is not implemented for `impl Future<Output = Result<(), ()>> { <T as Foo>::method() }`
= help: within `impl Future<Output = Result<(), ()>>`, the trait `Send` is not implemented for `impl Future<Output = Result<(), ()>> { <T as Foo>::method() }`, which is required by `impl Future<Output = Result<(), ()>>: Send`
note: future is not `Send` as it awaits another future which is not `Send`
--> $DIR/basic.rs:13:5
|
Expand Down
6 changes: 3 additions & 3 deletions tests/ui/associated-types/defaults-suitability.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,7 @@ error[E0277]: the trait bound `T: Clone` is not satisfied
--> $DIR/defaults-suitability.rs:28:23
|
LL | type Bar: Clone = Vec<T>;
| ^^^^^^ the trait `Clone` is not implemented for `T`
| ^^^^^^ the trait `Clone` is not implemented for `T`, which is required by `Vec<T>: Clone`
|
= note: required for `Vec<T>` to implement `Clone`
note: required by a bound in `Foo::Bar`
Expand Down Expand Up @@ -88,7 +88,7 @@ error[E0277]: the trait bound `<Self as Foo2<T>>::Baz: Clone` is not satisfied
--> $DIR/defaults-suitability.rs:65:23
|
LL | type Bar: Clone = Vec<Self::Baz>;
| ^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `<Self as Foo2<T>>::Baz`
| ^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `<Self as Foo2<T>>::Baz`, which is required by `Vec<<Self as Foo2<T>>::Baz>: Clone`
|
= note: required for `Vec<<Self as Foo2<T>>::Baz>` to implement `Clone`
note: required by a bound in `Foo2::Bar`
Expand All @@ -105,7 +105,7 @@ error[E0277]: the trait bound `<Self as Foo25<T>>::Baz: Clone` is not satisfied
--> $DIR/defaults-suitability.rs:74:23
|
LL | type Bar: Clone = Vec<Self::Baz>;
| ^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `<Self as Foo25<T>>::Baz`
| ^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `<Self as Foo25<T>>::Baz`, which is required by `Vec<<Self as Foo25<T>>::Baz>: Clone`
|
= note: required for `Vec<<Self as Foo25<T>>::Baz>` to implement `Clone`
note: required by a bound in `Foo25::Bar`
Expand Down
2 changes: 1 addition & 1 deletion tests/ui/associated-types/hr-associated-type-bound-1.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
--> $DIR/hr-associated-type-bound-1.rs:12:14
|
LL | type U = str;
| ^^^ the trait `Clone` is not implemented for `str`
| ^^^ the trait `Clone` is not implemented for `str`, which is required by `for<'b> <i32 as X<'b>>::U: Clone`
|
= help: the trait `Clone` is implemented for `String`
note: required by a bound in `X`
Expand Down
2 changes: 1 addition & 1 deletion tests/ui/associated-types/hr-associated-type-bound-param-1.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
--> $DIR/hr-associated-type-bound-param-1.rs:14:14
|
LL | type V = str;
| ^^^ the trait `Clone` is not implemented for `str`
| ^^^ the trait `Clone` is not implemented for `str`, which is required by `for<'b> <u8 as Y<'b, u8>>::V: Clone`
|
= help: the trait `Clone` is implemented for `String`
note: required by a bound in `Y`
Expand Down
2 changes: 1 addition & 1 deletion tests/ui/associated-types/hr-associated-type-bound-param-2.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
--> $DIR/hr-associated-type-bound-param-2.rs:15:14
|
LL | type W = str;
| ^^^ the trait `Clone` is not implemented for `str`
| ^^^ the trait `Clone` is not implemented for `str`, which is required by `for<'b> <u16 as Z<'b, u16>>::W: Clone`
|
= help: the trait `Clone` is implemented for `String`
note: required by a bound in `Z`
Expand Down
2 changes: 1 addition & 1 deletion tests/ui/associated-types/hr-associated-type-bound-param-3.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
--> $DIR/hr-associated-type-bound-param-3.rs:13:14
|
LL | type U = str;
| ^^^ the trait `Clone` is not implemented for `str`
| ^^^ the trait `Clone` is not implemented for `str`, which is required by `for<'b> <(T,) as X<'b, (T,)>>::U: Clone`
|
= help: the trait `Clone` is implemented for `String`
note: required by a bound in `X`
Expand Down
2 changes: 1 addition & 1 deletion tests/ui/associated-types/hr-associated-type-bound-param-4.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
--> $DIR/hr-associated-type-bound-param-4.rs:13:14
|
LL | type U = str;
| ^^^ the trait `Clone` is not implemented for `str`
| ^^^ the trait `Clone` is not implemented for `str`, which is required by `for<'b> <(T,) as X<'b, T>>::U: Clone`
|
= help: the trait `Clone` is implemented for `String`
note: required by a bound in `X`
Expand Down
4 changes: 2 additions & 2 deletions tests/ui/associated-types/hr-associated-type-bound-param-5.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
--> $DIR/hr-associated-type-bound-param-5.rs:26:14
|
LL | type U = str;
| ^^^ the trait `Clone` is not implemented for `str`
| ^^^ the trait `Clone` is not implemented for `str`, which is required by `for<'b> <<Vec<T> as Cycle>::Next as X<'b, <Vec<T> as Cycle>::Next>>::U: Clone`
|
= help: the trait `Clone` is implemented for `String`
note: required by a bound in `X`
Expand All @@ -18,7 +18,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
--> $DIR/hr-associated-type-bound-param-5.rs:31:14
|
LL | type U = str;
| ^^^ the trait `Clone` is not implemented for `str`
| ^^^ the trait `Clone` is not implemented for `str`, which is required by `for<'b> <<Box<T> as Cycle>::Next as X<'b, <Box<T> as Cycle>::Next>>::U: Clone`
|
= help: the trait `Clone` is implemented for `String`
note: required by a bound in `X`
Expand Down
32 changes: 16 additions & 16 deletions tests/ui/associated-types/issue-38821.stderr
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:17
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -21,7 +21,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:38:1
|
LL | pub enum ColumnInsertValue<Col, Expr> where
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -45,7 +45,7 @@ LL | | Col: Column,
... |
LL | | Default(Col),
LL | | }
| |_^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| |_^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -63,7 +63,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:10
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -82,7 +82,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:10
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -102,7 +102,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:10
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -117,7 +117,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:10
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -133,7 +133,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:17
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -153,7 +153,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:23
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -172,7 +172,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:23
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -192,7 +192,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:23
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -207,7 +207,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:23
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -223,7 +223,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:10
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -239,7 +239,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:10
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -255,7 +255,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:23
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand All @@ -271,7 +271,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
--> $DIR/issue-38821.rs:23:23
|
LL | #[derive(Debug, Copy, Clone)]
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
|
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
--> $DIR/issue-38821.rs:9:18
Expand Down
2 changes: 1 addition & 1 deletion tests/ui/associated-types/issue-43784-associated-type.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ error[E0277]: the trait bound `T: Copy` is not satisfied
--> $DIR/issue-43784-associated-type.rs:14:18
|
LL | type Assoc = T;
| ^ the trait `Copy` is not implemented for `T`
| ^ the trait `Copy` is not implemented for `T`, which is required by `<T as Complete>::Assoc: Partial<T>`
|
note: required for `<T as Complete>::Assoc` to implement `Partial<T>`
--> $DIR/issue-43784-associated-type.rs:1:11
Expand Down
2 changes: 1 addition & 1 deletion tests/ui/associated-types/issue-65774-1.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@ error[E0277]: the trait bound `T: MyDisplay` is not satisfied
--> $DIR/issue-65774-1.rs:44:76
|
LL | let closure = |config: &mut <S as MPU>::MpuConfig| writer.my_write(&config);
| ^^^^^^^ the trait `MyDisplay` is not implemented for `T`
| ^^^^^^^ the trait `MyDisplay` is not implemented for `T`, which is required by `&mut T: MyDisplay`
|
= help: the trait `MyDisplay` is implemented for `&'a mut T`
note: required for `&mut T` to implement `MyDisplay`
Expand Down
2 changes: 1 addition & 1 deletion tests/ui/associated-types/substs-ppaux.normal.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -76,7 +76,7 @@ error[E0277]: the size for values of type `str` cannot be known at compilation t
LL | <str as Foo<u8>>::bar;
| ^^^ doesn't have a size known at compile-time
|
= help: the trait `Sized` is not implemented for `str`
= help: the trait `Sized` is not implemented for `str`, which is required by `str: Foo<'_, '_, u8>`
note: required for `str` to implement `Foo<'_, '_, u8>`
--> $DIR/substs-ppaux.rs:11:17
|
Expand Down
2 changes: 1 addition & 1 deletion tests/ui/associated-types/substs-ppaux.verbose.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -76,7 +76,7 @@ error[E0277]: the size for values of type `str` cannot be known at compilation t
LL | <str as Foo<u8>>::bar;
| ^^^ doesn't have a size known at compile-time
|
= help: the trait `Sized` is not implemented for `str`
= help: the trait `Sized` is not implemented for `str`, which is required by `str: Foo<'?0, '?1, u8>`
note: required for `str` to implement `Foo<'?0, '?1, u8>`
--> $DIR/substs-ppaux.rs:11:17
|
Expand Down
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