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Provide more context on derived obligation error primary label
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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‎compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

+25-16
Original file line numberDiff line numberDiff line change
@@ -1432,20 +1432,18 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
14321432
) -> bool {
14331433
let span = obligation.cause.span;
14341434

1435-
let code = if let ObligationCauseCode::FunctionArgumentObligation { parent_code, .. } =
1436-
obligation.cause.code()
1437-
{
1438-
parent_code
1439-
} else if let ObligationCauseCode::ItemObligation(_)
1440-
| ObligationCauseCode::ExprItemObligation(..) = obligation.cause.code()
1441-
{
1442-
obligation.cause.code()
1443-
} else if let ExpnKind::Desugaring(DesugaringKind::ForLoop) =
1444-
span.ctxt().outer_expn_data().kind
1445-
{
1446-
obligation.cause.code()
1447-
} else {
1448-
return false;
1435+
let code = match obligation.cause.code() {
1436+
ObligationCauseCode::FunctionArgumentObligation { parent_code, .. } => parent_code,
1437+
c @ ObligationCauseCode::ItemObligation(_)
1438+
| c @ ObligationCauseCode::ExprItemObligation(..) => c,
1439+
c if matches!(
1440+
span.ctxt().outer_expn_data().kind,
1441+
ExpnKind::Desugaring(DesugaringKind::ForLoop)
1442+
) =>
1443+
{
1444+
c
1445+
}
1446+
_ => return false,
14491447
};
14501448

14511449
// List of traits for which it would be nonsensical to suggest borrowing.
@@ -4978,16 +4976,27 @@ pub(super) fn get_explanation_based_on_obligation<'tcx>(
49784976
_ => None,
49794977
};
49804978

4979+
let pred = obligation.predicate;
4980+
let (_, base) = obligation.cause.code().peel_derives_with_predicate();
4981+
let post = if let ty::PredicateKind::Clause(clause) = pred.kind().skip_binder()
4982+
&& let ty::ClauseKind::Trait(pred) = clause
4983+
&& let Some(base) = base
4984+
&& base.skip_binder() != pred
4985+
{
4986+
format!(", which is required by `{base}`")
4987+
} else {
4988+
String::new()
4989+
};
49814990
match ty_desc {
49824991
Some(desc) => format!(
4983-
"{}the trait `{}` is not implemented for {} `{}`",
4992+
"{}the trait `{}` is not implemented for {} `{}`{post}",
49844993
pre_message,
49854994
trait_predicate.print_modifiers_and_trait_path(),
49864995
desc,
49874996
tcx.short_ty_string(trait_ref.skip_binder().self_ty(), &mut None),
49884997
),
49894998
None => format!(
4990-
"{}the trait `{}` is not implemented for `{}`",
4999+
"{}the trait `{}` is not implemented for `{}`{post}",
49915000
pre_message,
49925001
trait_predicate.print_modifiers_and_trait_path(),
49935002
tcx.short_ty_string(trait_ref.skip_binder().self_ty(), &mut None),

‎tests/ui/associated-consts/issue-58022.stderr

+1-1
Original file line numberDiff line numberDiff line change
@@ -13,7 +13,7 @@ error[E0277]: the size for values of type `[u8]` cannot be known at compilation
1313
LL | fn new(slice: &[u8; Self::SIZE]) -> Self {
1414
| ^^^^ doesn't have a size known at compile-time
1515
|
16-
= help: within `Bar<[u8]>`, the trait `Sized` is not implemented for `[u8]`
16+
= help: within `Bar<[u8]>`, the trait `Sized` is not implemented for `[u8]`, which is required by `Bar<[u8]>: Sized`
1717
note: required because it appears within the type `Bar<[u8]>`
1818
--> $DIR/issue-58022.rs:8:12
1919
|

‎tests/ui/associated-type-bounds/return-type-notation/basic.without.stderr

+1-1
Original file line numberDiff line numberDiff line change
@@ -13,7 +13,7 @@ error: future cannot be sent between threads safely
1313
LL | is_send(foo::<T>());
1414
| ^^^^^^^^^^ future returned by `foo` is not `Send`
1515
|
16-
= help: within `impl Future<Output = Result<(), ()>>`, the trait `Send` is not implemented for `impl Future<Output = Result<(), ()>> { <T as Foo>::method() }`
16+
= 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`
1717
note: future is not `Send` as it awaits another future which is not `Send`
1818
--> $DIR/basic.rs:13:5
1919
|

‎tests/ui/associated-types/defaults-suitability.stderr

+3-3
Original file line numberDiff line numberDiff line change
@@ -39,7 +39,7 @@ error[E0277]: the trait bound `T: Clone` is not satisfied
3939
--> $DIR/defaults-suitability.rs:28:23
4040
|
4141
LL | type Bar: Clone = Vec<T>;
42-
| ^^^^^^ the trait `Clone` is not implemented for `T`
42+
| ^^^^^^ the trait `Clone` is not implemented for `T`, which is required by `Vec<T>: Clone`
4343
|
4444
= note: required for `Vec<T>` to implement `Clone`
4545
note: required by a bound in `Foo::Bar`
@@ -88,7 +88,7 @@ error[E0277]: the trait bound `<Self as Foo2<T>>::Baz: Clone` is not satisfied
8888
--> $DIR/defaults-suitability.rs:65:23
8989
|
9090
LL | type Bar: Clone = Vec<Self::Baz>;
91-
| ^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `<Self as Foo2<T>>::Baz`
91+
| ^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `<Self as Foo2<T>>::Baz`, which is required by `Vec<<Self as Foo2<T>>::Baz>: Clone`
9292
|
9393
= note: required for `Vec<<Self as Foo2<T>>::Baz>` to implement `Clone`
9494
note: required by a bound in `Foo2::Bar`
@@ -105,7 +105,7 @@ error[E0277]: the trait bound `<Self as Foo25<T>>::Baz: Clone` is not satisfied
105105
--> $DIR/defaults-suitability.rs:74:23
106106
|
107107
LL | type Bar: Clone = Vec<Self::Baz>;
108-
| ^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `<Self as Foo25<T>>::Baz`
108+
| ^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `<Self as Foo25<T>>::Baz`, which is required by `Vec<<Self as Foo25<T>>::Baz>: Clone`
109109
|
110110
= note: required for `Vec<<Self as Foo25<T>>::Baz>` to implement `Clone`
111111
note: required by a bound in `Foo25::Bar`

‎tests/ui/associated-types/hr-associated-type-bound-1.stderr

+1-1
Original file line numberDiff line numberDiff line change
@@ -2,7 +2,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
22
--> $DIR/hr-associated-type-bound-1.rs:12:14
33
|
44
LL | type U = str;
5-
| ^^^ the trait `Clone` is not implemented for `str`
5+
| ^^^ the trait `Clone` is not implemented for `str`, which is required by `for<'b> <i32 as X<'b>>::U: Clone`
66
|
77
= help: the trait `Clone` is implemented for `String`
88
note: required by a bound in `X`

‎tests/ui/associated-types/hr-associated-type-bound-param-1.stderr

+1-1
Original file line numberDiff line numberDiff line change
@@ -2,7 +2,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
22
--> $DIR/hr-associated-type-bound-param-1.rs:14:14
33
|
44
LL | type V = str;
5-
| ^^^ the trait `Clone` is not implemented for `str`
5+
| ^^^ the trait `Clone` is not implemented for `str`, which is required by `for<'b> <u8 as Y<'b, u8>>::V: Clone`
66
|
77
= help: the trait `Clone` is implemented for `String`
88
note: required by a bound in `Y`

‎tests/ui/associated-types/hr-associated-type-bound-param-2.stderr

+1-1
Original file line numberDiff line numberDiff line change
@@ -18,7 +18,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
1818
--> $DIR/hr-associated-type-bound-param-2.rs:15:14
1919
|
2020
LL | type W = str;
21-
| ^^^ the trait `Clone` is not implemented for `str`
21+
| ^^^ the trait `Clone` is not implemented for `str`, which is required by `for<'b> <u16 as Z<'b, u16>>::W: Clone`
2222
|
2323
= help: the trait `Clone` is implemented for `String`
2424
note: required by a bound in `Z`

‎tests/ui/associated-types/hr-associated-type-bound-param-3.stderr

+1-1
Original file line numberDiff line numberDiff line change
@@ -2,7 +2,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
22
--> $DIR/hr-associated-type-bound-param-3.rs:13:14
33
|
44
LL | type U = str;
5-
| ^^^ the trait `Clone` is not implemented for `str`
5+
| ^^^ the trait `Clone` is not implemented for `str`, which is required by `for<'b> <(T,) as X<'b, (T,)>>::U: Clone`
66
|
77
= help: the trait `Clone` is implemented for `String`
88
note: required by a bound in `X`

‎tests/ui/associated-types/hr-associated-type-bound-param-4.stderr

+1-1
Original file line numberDiff line numberDiff line change
@@ -2,7 +2,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
22
--> $DIR/hr-associated-type-bound-param-4.rs:13:14
33
|
44
LL | type U = str;
5-
| ^^^ the trait `Clone` is not implemented for `str`
5+
| ^^^ the trait `Clone` is not implemented for `str`, which is required by `for<'b> <(T,) as X<'b, T>>::U: Clone`
66
|
77
= help: the trait `Clone` is implemented for `String`
88
note: required by a bound in `X`

‎tests/ui/associated-types/hr-associated-type-bound-param-5.stderr

+2-2
Original file line numberDiff line numberDiff line change
@@ -2,7 +2,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
22
--> $DIR/hr-associated-type-bound-param-5.rs:26:14
33
|
44
LL | type U = str;
5-
| ^^^ the trait `Clone` is not implemented for `str`
5+
| ^^^ 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`
66
|
77
= help: the trait `Clone` is implemented for `String`
88
note: required by a bound in `X`
@@ -18,7 +18,7 @@ error[E0277]: the trait bound `str: Clone` is not satisfied
1818
--> $DIR/hr-associated-type-bound-param-5.rs:31:14
1919
|
2020
LL | type U = str;
21-
| ^^^ the trait `Clone` is not implemented for `str`
21+
| ^^^ 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`
2222
|
2323
= help: the trait `Clone` is implemented for `String`
2424
note: required by a bound in `X`

‎tests/ui/associated-types/issue-38821.stderr

+16-16
Original file line numberDiff line numberDiff line change
@@ -2,7 +2,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
22
--> $DIR/issue-38821.rs:23:17
33
|
44
LL | #[derive(Debug, Copy, Clone)]
5-
| ^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
5+
| ^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
66
|
77
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
88
--> $DIR/issue-38821.rs:9:18
@@ -21,7 +21,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
2121
--> $DIR/issue-38821.rs:38:1
2222
|
2323
LL | pub enum ColumnInsertValue<Col, Expr> where
24-
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
24+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
2525
|
2626
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
2727
--> $DIR/issue-38821.rs:9:18
@@ -45,7 +45,7 @@ LL | | Col: Column,
4545
... |
4646
LL | | Default(Col),
4747
LL | | }
48-
| |_^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
48+
| |_^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
4949
|
5050
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
5151
--> $DIR/issue-38821.rs:9:18
@@ -63,7 +63,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
6363
--> $DIR/issue-38821.rs:23:10
6464
|
6565
LL | #[derive(Debug, Copy, Clone)]
66-
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
66+
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
6767
|
6868
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
6969
--> $DIR/issue-38821.rs:9:18
@@ -82,7 +82,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
8282
--> $DIR/issue-38821.rs:23:10
8383
|
8484
LL | #[derive(Debug, Copy, Clone)]
85-
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
85+
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
8686
|
8787
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
8888
--> $DIR/issue-38821.rs:9:18
@@ -102,7 +102,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
102102
--> $DIR/issue-38821.rs:23:10
103103
|
104104
LL | #[derive(Debug, Copy, Clone)]
105-
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
105+
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
106106
|
107107
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
108108
--> $DIR/issue-38821.rs:9:18
@@ -117,7 +117,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
117117
--> $DIR/issue-38821.rs:23:10
118118
|
119119
LL | #[derive(Debug, Copy, Clone)]
120-
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
120+
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
121121
|
122122
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
123123
--> $DIR/issue-38821.rs:9:18
@@ -133,7 +133,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
133133
--> $DIR/issue-38821.rs:23:17
134134
|
135135
LL | #[derive(Debug, Copy, Clone)]
136-
| ^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
136+
| ^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
137137
|
138138
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
139139
--> $DIR/issue-38821.rs:9:18
@@ -153,7 +153,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
153153
--> $DIR/issue-38821.rs:23:23
154154
|
155155
LL | #[derive(Debug, Copy, Clone)]
156-
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
156+
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
157157
|
158158
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
159159
--> $DIR/issue-38821.rs:9:18
@@ -172,7 +172,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
172172
--> $DIR/issue-38821.rs:23:23
173173
|
174174
LL | #[derive(Debug, Copy, Clone)]
175-
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
175+
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
176176
|
177177
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
178178
--> $DIR/issue-38821.rs:9:18
@@ -192,7 +192,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
192192
--> $DIR/issue-38821.rs:23:23
193193
|
194194
LL | #[derive(Debug, Copy, Clone)]
195-
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
195+
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
196196
|
197197
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
198198
--> $DIR/issue-38821.rs:9:18
@@ -207,7 +207,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
207207
--> $DIR/issue-38821.rs:23:23
208208
|
209209
LL | #[derive(Debug, Copy, Clone)]
210-
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
210+
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
211211
|
212212
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
213213
--> $DIR/issue-38821.rs:9:18
@@ -223,7 +223,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
223223
--> $DIR/issue-38821.rs:23:10
224224
|
225225
LL | #[derive(Debug, Copy, Clone)]
226-
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
226+
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
227227
|
228228
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
229229
--> $DIR/issue-38821.rs:9:18
@@ -239,7 +239,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
239239
--> $DIR/issue-38821.rs:23:10
240240
|
241241
LL | #[derive(Debug, Copy, Clone)]
242-
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
242+
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
243243
|
244244
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
245245
--> $DIR/issue-38821.rs:9:18
@@ -255,7 +255,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
255255
--> $DIR/issue-38821.rs:23:23
256256
|
257257
LL | #[derive(Debug, Copy, Clone)]
258-
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
258+
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
259259
|
260260
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
261261
--> $DIR/issue-38821.rs:9:18
@@ -271,7 +271,7 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
271271
--> $DIR/issue-38821.rs:23:23
272272
|
273273
LL | #[derive(Debug, Copy, Clone)]
274-
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
274+
| ^^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`, which is required by `<Col as Expression>::SqlType: IntoNullable`
275275
|
276276
note: required for `<Col as Expression>::SqlType` to implement `IntoNullable`
277277
--> $DIR/issue-38821.rs:9:18

‎tests/ui/associated-types/issue-43784-associated-type.stderr

+1-1
Original file line numberDiff line numberDiff line change
@@ -2,7 +2,7 @@ error[E0277]: the trait bound `T: Copy` is not satisfied
22
--> $DIR/issue-43784-associated-type.rs:14:18
33
|
44
LL | type Assoc = T;
5-
| ^ the trait `Copy` is not implemented for `T`
5+
| ^ the trait `Copy` is not implemented for `T`, which is required by `<T as Complete>::Assoc: Partial<T>`
66
|
77
note: required for `<T as Complete>::Assoc` to implement `Partial<T>`
88
--> $DIR/issue-43784-associated-type.rs:1:11

‎tests/ui/associated-types/issue-65774-1.stderr

+1-1
Original file line numberDiff line numberDiff line change
@@ -15,7 +15,7 @@ error[E0277]: the trait bound `T: MyDisplay` is not satisfied
1515
--> $DIR/issue-65774-1.rs:44:76
1616
|
1717
LL | let closure = |config: &mut <S as MPU>::MpuConfig| writer.my_write(&config);
18-
| ^^^^^^^ the trait `MyDisplay` is not implemented for `T`
18+
| ^^^^^^^ the trait `MyDisplay` is not implemented for `T`, which is required by `&mut T: MyDisplay`
1919
|
2020
= help: the trait `MyDisplay` is implemented for `&'a mut T`
2121
note: required for `&mut T` to implement `MyDisplay`

‎tests/ui/associated-types/substs-ppaux.normal.stderr

+1-1
Original file line numberDiff line numberDiff line change
@@ -76,7 +76,7 @@ error[E0277]: the size for values of type `str` cannot be known at compilation t
7676
LL | <str as Foo<u8>>::bar;
7777
| ^^^ doesn't have a size known at compile-time
7878
|
79-
= help: the trait `Sized` is not implemented for `str`
79+
= help: the trait `Sized` is not implemented for `str`, which is required by `str: Foo<'_, '_, u8>`
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note: required for `str` to implement `Foo<'_, '_, u8>`
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--> $DIR/substs-ppaux.rs:11:17
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|

‎tests/ui/associated-types/substs-ppaux.verbose.stderr

+1-1
Original file line numberDiff line numberDiff line change
@@ -76,7 +76,7 @@ error[E0277]: the size for values of type `str` cannot be known at compilation t
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LL | <str as Foo<u8>>::bar;
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| ^^^ doesn't have a size known at compile-time
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|
79-
= help: the trait `Sized` is not implemented for `str`
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= help: the trait `Sized` is not implemented for `str`, which is required by `str: Foo<'?0, '?1, u8>`
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note: required for `str` to implement `Foo<'?0, '?1, u8>`
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--> $DIR/substs-ppaux.rs:11:17
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|

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