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Increase verbosity of bound restriction suggestions
- Make the bound restriction suggestion `span_suggestion_verbose`. - Fix whitespace typo.
1 parent 545320a commit 45738e8

32 files changed

+215
-123
lines changed

‎src/librustc_trait_selection/traits/error_reporting/suggestions.rs

+8-4
Original file line numberDiff line numberDiff line change
@@ -156,7 +156,7 @@ fn predicate_constraint(generics: &hir::Generics<'_>, pred: String) -> (Span, St
156156
(
157157
generics.where_clause.span_for_predicates_or_empty_place().shrink_to_hi(),
158158
format!(
159-
"{} {} ",
159+
"{} {}",
160160
if !generics.where_clause.predicates.is_empty() { "," } else { " where" },
161161
pred,
162162
),
@@ -263,7 +263,7 @@ fn suggest_restriction(
263263
);
264264
} else {
265265
// Trivial case: `T` needs an extra bound: `T: Bound`.
266-
let (sp, sugg) = match super_traits {
266+
let (sp, suggestion) = match super_traits {
267267
None => {
268268
predicate_constraint(generics, trait_ref.without_const().to_predicate().to_string())
269269
}
@@ -279,8 +279,12 @@ fn suggest_restriction(
279279
},
280280
};
281281

282-
let appl = Applicability::MachineApplicable;
283-
err.span_suggestion(sp, &format!("consider further restricting {}", msg), sugg, appl);
282+
err.span_suggestion_verbose(
283+
sp,
284+
&format!("consider further restricting {}", msg),
285+
suggestion,
286+
Applicability::MachineApplicable,
287+
);
284288
}
285289
}
286290

‎src/test/ui/associated-type-bounds/bad-bounds-on-assoc-in-trait.stderr

+15-9
Original file line numberDiff line numberDiff line change
@@ -16,11 +16,13 @@ error[E0277]: `<<T as Case1>::C as std::iter::Iterator>::Item` is not an iterato
1616
--> $DIR/bad-bounds-on-assoc-in-trait.rs:36:20
1717
|
1818
LL | fn assume_case1<T: Case1>() {
19-
| ^^^^^ - help: consider further restricting the associated type: `where <<T as Case1>::C as std::iter::Iterator>::Item: std::iter::Iterator`
20-
| |
21-
| `<<T as Case1>::C as std::iter::Iterator>::Item` is not an iterator
19+
| ^^^^^ `<<T as Case1>::C as std::iter::Iterator>::Item` is not an iterator
2220
|
2321
= help: the trait `std::iter::Iterator` is not implemented for `<<T as Case1>::C as std::iter::Iterator>::Item`
22+
help: consider further restricting the associated type
23+
|
24+
LL | fn assume_case1<T: Case1>() where <<T as Case1>::C as std::iter::Iterator>::Item: std::iter::Iterator {
25+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2426

2527
error[E0277]: `<<T as Case1>::C as std::iter::Iterator>::Item` cannot be sent between threads safely
2628
--> $DIR/bad-bounds-on-assoc-in-trait.rs:36:20
@@ -32,11 +34,13 @@ LL | Send + Iterator<Item:
3234
| ---- required by this bound in `Case1`
3335
...
3436
LL | fn assume_case1<T: Case1>() {
35-
| ^^^^^ - help: consider further restricting the associated type: `where <<T as Case1>::C as std::iter::Iterator>::Item: std::marker::Send`
36-
| |
37-
| `<<T as Case1>::C as std::iter::Iterator>::Item` cannot be sent between threads safely
37+
| ^^^^^ `<<T as Case1>::C as std::iter::Iterator>::Item` cannot be sent between threads safely
3838
|
3939
= help: the trait `std::marker::Send` is not implemented for `<<T as Case1>::C as std::iter::Iterator>::Item`
40+
help: consider further restricting the associated type
41+
|
42+
LL | fn assume_case1<T: Case1>() where <<T as Case1>::C as std::iter::Iterator>::Item: std::marker::Send {
43+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
4044

4145
error[E0277]: `<<T as Case1>::C as std::iter::Iterator>::Item` cannot be shared between threads safely
4246
--> $DIR/bad-bounds-on-assoc-in-trait.rs:36:20
@@ -48,11 +52,13 @@ LL | > + Sync>;
4852
| ---- required by this bound in `Case1`
4953
...
5054
LL | fn assume_case1<T: Case1>() {
51-
| ^^^^^ - help: consider further restricting the associated type: `where <<T as Case1>::C as std::iter::Iterator>::Item: std::marker::Sync`
52-
| |
53-
| `<<T as Case1>::C as std::iter::Iterator>::Item` cannot be shared between threads safely
55+
| ^^^^^ `<<T as Case1>::C as std::iter::Iterator>::Item` cannot be shared between threads safely
5456
|
5557
= help: the trait `std::marker::Sync` is not implemented for `<<T as Case1>::C as std::iter::Iterator>::Item`
58+
help: consider further restricting the associated type
59+
|
60+
LL | fn assume_case1<T: Case1>() where <<T as Case1>::C as std::iter::Iterator>::Item: std::marker::Sync {
61+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
5662

5763
error[E0277]: `<_ as Lam<&'a u8>>::App` doesn't implement `std::fmt::Debug`
5864
--> $DIR/bad-bounds-on-assoc-in-trait.rs:36:20

‎src/test/ui/associated-types/associated-types-bound-failure.fixed

+1-1
Original file line numberDiff line numberDiff line change
@@ -14,7 +14,7 @@ pub trait GetToInt
1414
}
1515

1616
fn foo<G>(g: G) -> isize
17-
where G : GetToInt, <G as GetToInt>::R: ToInt
17+
where G : GetToInt, <G as GetToInt>::R: ToInt
1818
{
1919
ToInt::to_int(&g.get()) //~ ERROR E0277
2020
}

‎src/test/ui/associated-types/associated-types-bound-failure.stderr

+5-3
Original file line numberDiff line numberDiff line change
@@ -4,11 +4,13 @@ error[E0277]: the trait bound `<G as GetToInt>::R: ToInt` is not satisfied
44
LL | fn to_int(&self) -> isize;
55
| -------------------------- required by `ToInt::to_int`
66
...
7-
LL | where G : GetToInt
8-
| - help: consider further restricting the associated type: `, <G as GetToInt>::R: ToInt`
9-
LL | {
107
LL | ToInt::to_int(&g.get())
118
| ^^^^^^^^ the trait `ToInt` is not implemented for `<G as GetToInt>::R`
9+
|
10+
help: consider further restricting the associated type
11+
|
12+
LL | where G : GetToInt, <G as GetToInt>::R: ToInt
13+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
1214

1315
error: aborting due to previous error
1416

‎src/test/ui/associated-types/associated-types-for-unimpl-trait.fixed

+1-1
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@ trait Get {
77
}
88

99
trait Other {
10-
fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get {}
10+
fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get {}
1111
//~^ ERROR the trait bound `Self: Get` is not satisfied
1212
}
1313

‎src/test/ui/associated-types/associated-types-for-unimpl-trait.stderr

+6-4
Original file line numberDiff line numberDiff line change
@@ -2,10 +2,12 @@ error[E0277]: the trait bound `Self: Get` is not satisfied
22
--> $DIR/associated-types-for-unimpl-trait.rs:10:5
33
|
44
LL | fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) {}
5-
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-^^
6-
| | |
7-
| | help: consider further restricting `Self`: `where Self: Get`
8-
| the trait `Get` is not implemented for `Self`
5+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Get` is not implemented for `Self`
6+
|
7+
help: consider further restricting `Self`
8+
|
9+
LL | fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get {}
10+
| ^^^^^^^^^^^^^^^
911

1012
error: aborting due to previous error
1113

‎src/test/ui/associated-types/associated-types-no-suitable-supertrait-2.stderr

+6-4
Original file line numberDiff line numberDiff line change
@@ -2,10 +2,12 @@ error[E0277]: the trait bound `Self: Get` is not satisfied
22
--> $DIR/associated-types-no-suitable-supertrait-2.rs:17:5
33
|
44
LL | fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) {}
5-
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-^^
6-
| | |
7-
| | help: consider further restricting `Self`: `where Self: Get`
8-
| the trait `Get` is not implemented for `Self`
5+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Get` is not implemented for `Self`
6+
|
7+
help: consider further restricting `Self`
8+
|
9+
LL | fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get {}
10+
| ^^^^^^^^^^^^^^^
911

1012
error: aborting due to previous error
1113

‎src/test/ui/associated-types/associated-types-no-suitable-supertrait.stderr

+6-4
Original file line numberDiff line numberDiff line change
@@ -2,10 +2,12 @@ error[E0277]: the trait bound `Self: Get` is not satisfied
22
--> $DIR/associated-types-no-suitable-supertrait.rs:17:5
33
|
44
LL | fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) {}
5-
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-^^
6-
| | |
7-
| | help: consider further restricting `Self`: `where Self: Get`
8-
| the trait `Get` is not implemented for `Self`
5+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Get` is not implemented for `Self`
6+
|
7+
help: consider further restricting `Self`
8+
|
9+
LL | fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get {}
10+
| ^^^^^^^^^^^^^^^
911

1012
error[E0277]: the trait bound `(T, U): Get` is not satisfied
1113
--> $DIR/associated-types-no-suitable-supertrait.rs:22:5

‎src/test/ui/associated-types/associated-types-projection-to-unrelated-trait-in-method-without-default.fixed

+1-1
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@ trait Get {
77
}
88

99
trait Other {
10-
fn okay<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get ;
10+
fn okay<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get;
1111
//~^ ERROR E0277
1212
}
1313

‎src/test/ui/associated-types/associated-types-projection-to-unrelated-trait-in-method-without-default.stderr

+6-4
Original file line numberDiff line numberDiff line change
@@ -2,10 +2,12 @@ error[E0277]: the trait bound `Self: Get` is not satisfied
22
--> $DIR/associated-types-projection-to-unrelated-trait-in-method-without-default.rs:10:5
33
|
44
LL | fn okay<U:Get>(&self, foo: U, bar: <Self as Get>::Value);
5-
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
6-
| | |
7-
| | help: consider further restricting `Self`: `where Self: Get`
8-
| the trait `Get` is not implemented for `Self`
5+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Get` is not implemented for `Self`
6+
|
7+
help: consider further restricting `Self`
8+
|
9+
LL | fn okay<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get;
10+
| ^^^^^^^^^^^^^^^
911

1012
error: aborting due to previous error
1113

‎src/test/ui/associated-types/associated-types-unsized.fixed

+1-1
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@ trait Get {
66
fn get(&self) -> <Self as Get>::Value;
77
}
88

9-
fn foo<T:Get>(t: T) where <T as Get>::Value: std::marker::Sized {
9+
fn foo<T:Get>(t: T) where <T as Get>::Value: std::marker::Sized {
1010
let x = t.get(); //~ ERROR the size for values of type
1111
}
1212

‎src/test/ui/associated-types/associated-types-unsized.stderr

+4-2
Original file line numberDiff line numberDiff line change
@@ -1,15 +1,17 @@
11
error[E0277]: the size for values of type `<T as Get>::Value` cannot be known at compilation time
22
--> $DIR/associated-types-unsized.rs:10:9
33
|
4-
LL | fn foo<T:Get>(t: T) {
5-
| - help: consider further restricting the associated type: `where <T as Get>::Value: std::marker::Sized`
64
LL | let x = t.get();
75
| ^ doesn't have a size known at compile-time
86
|
97
= help: the trait `std::marker::Sized` is not implemented for `<T as Get>::Value`
108
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
119
= note: all local variables must have a statically known size
1210
= help: unsized locals are gated as an unstable feature
11+
help: consider further restricting the associated type
12+
|
13+
LL | fn foo<T:Get>(t: T) where <T as Get>::Value: std::marker::Sized {
14+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1315

1416
error: aborting due to previous error
1517

‎src/test/ui/associated-types/defaults-suitability.stderr

+10-6
Original file line numberDiff line numberDiff line change
@@ -85,25 +85,29 @@ error[E0277]: the trait bound `<Self as Foo2<T>>::Baz: std::clone::Clone` is not
8585
--> $DIR/defaults-suitability.rs:72:15
8686
|
8787
LL | trait Foo2<T> {
88-
| -------------- help: consider further restricting the associated type: `where <Self as Foo2<T>>::Baz: std::clone::Clone`
89-
| |
90-
| required by `Foo2`
88+
| ------------- required by `Foo2`
9189
LL | type Bar: Clone = Vec<Self::Baz>;
9290
| ^^^^^ the trait `std::clone::Clone` is not implemented for `<Self as Foo2<T>>::Baz`
9391
|
9492
= note: required because of the requirements on the impl of `std::clone::Clone` for `std::vec::Vec<<Self as Foo2<T>>::Baz>`
93+
help: consider further restricting the associated type
94+
|
95+
LL | trait Foo2<T> where <Self as Foo2<T>>::Baz: std::clone::Clone {
96+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
9597

9698
error[E0277]: the trait bound `<Self as Foo25<T>>::Baz: std::clone::Clone` is not satisfied
9799
--> $DIR/defaults-suitability.rs:81:15
98100
|
99101
LL | trait Foo25<T: Clone> {
100-
| ---------------------- help: consider further restricting the associated type: `where <Self as Foo25<T>>::Baz: std::clone::Clone`
101-
| |
102-
| required by `Foo25`
102+
| --------------------- required by `Foo25`
103103
LL | type Bar: Clone = Vec<Self::Baz>;
104104
| ^^^^^ the trait `std::clone::Clone` is not implemented for `<Self as Foo25<T>>::Baz`
105105
|
106106
= note: required because of the requirements on the impl of `std::clone::Clone` for `std::vec::Vec<<Self as Foo25<T>>::Baz>`
107+
help: consider further restricting the associated type
108+
|
109+
LL | trait Foo25<T: Clone> where <Self as Foo25<T>>::Baz: std::clone::Clone {
110+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
107111

108112
error[E0277]: the trait bound `T: std::clone::Clone` is not satisfied
109113
--> $DIR/defaults-suitability.rs:90:16

‎src/test/ui/associated-types/defaults-unsound-62211-1.stderr

+22-12
Original file line numberDiff line numberDiff line change
@@ -2,50 +2,60 @@ error[E0277]: the trait bound `Self: std::marker::Copy` is not satisfied
22
--> $DIR/defaults-unsound-62211-1.rs:21:18
33
|
44
LL | trait UncheckedCopy: Sized {
5-
| --------------------------- help: consider further restricting `Self`: `+ std::marker::Copy`
6-
| |
7-
| required by `UncheckedCopy`
5+
| -------------------------- required by `UncheckedCopy`
86
...
97
LL | type Output: Copy
108
| ^^^^ the trait `std::marker::Copy` is not implemented for `Self`
9+
|
10+
help: consider further restricting `Self`
11+
|
12+
LL | trait UncheckedCopy: Sized + std::marker::Copy {
13+
| ^^^^^^^^^^^^^^^^^^^
1114

1215
error[E0277]: cannot add-assign `&'static str` to `Self`
1316
--> $DIR/defaults-unsound-62211-1.rs:25:7
1417
|
1518
LL | trait UncheckedCopy: Sized {
16-
| --------------------------- help: consider further restricting `Self`: `+ std::ops::AddAssign<&'static str>`
17-
| |
18-
| required by `UncheckedCopy`
19+
| -------------------------- required by `UncheckedCopy`
1920
...
2021
LL | + AddAssign<&'static str>
2122
| ^^^^^^^^^^^^^^^^^^^^^^^ no implementation for `Self += &'static str`
2223
|
2324
= help: the trait `std::ops::AddAssign<&'static str>` is not implemented for `Self`
25+
help: consider further restricting `Self`
26+
|
27+
LL | trait UncheckedCopy: Sized + std::ops::AddAssign<&'static str> {
28+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2429

2530
error[E0277]: the trait bound `Self: std::ops::Deref` is not satisfied
2631
--> $DIR/defaults-unsound-62211-1.rs:23:7
2732
|
2833
LL | trait UncheckedCopy: Sized {
29-
| --------------------------- help: consider further restricting `Self`: `+ std::ops::Deref`
30-
| |
31-
| required by `UncheckedCopy`
34+
| -------------------------- required by `UncheckedCopy`
3235
...
3336
LL | + Deref<Target = str>
3437
| ^^^^^^^^^^^^^^^^^^^ the trait `std::ops::Deref` is not implemented for `Self`
38+
|
39+
help: consider further restricting `Self`
40+
|
41+
LL | trait UncheckedCopy: Sized + std::ops::Deref {
42+
| ^^^^^^^^^^^^^^^^^
3543

3644
error[E0277]: `Self` doesn't implement `std::fmt::Display`
3745
--> $DIR/defaults-unsound-62211-1.rs:28:7
3846
|
3947
LL | trait UncheckedCopy: Sized {
40-
| --------------------------- help: consider further restricting `Self`: `+ std::fmt::Display`
41-
| |
42-
| required by `UncheckedCopy`
48+
| -------------------------- required by `UncheckedCopy`
4349
...
4450
LL | + Display = Self;
4551
| ^^^^^^^ `Self` cannot be formatted with the default formatter
4652
|
4753
= help: the trait `std::fmt::Display` is not implemented for `Self`
4854
= note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
55+
help: consider further restricting `Self`
56+
|
57+
LL | trait UncheckedCopy: Sized + std::fmt::Display {
58+
| ^^^^^^^^^^^^^^^^^^^
4959

5060
error[E0277]: `T` doesn't implement `std::fmt::Display`
5161
--> $DIR/defaults-unsound-62211-1.rs:41:9

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