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Auto merge of #71451 - estebank:suggest-super-trait-constraint, r=nikomatsakis

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Suggest adding super trait constraints
This commit is contained in:
bors 2020-05-13 06:54:15 +00:00
commit 750db09fa8
34 changed files with 282 additions and 100 deletions
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64
src/librustc_trait_selection/traits/error_reporting/suggestions.rs
View File

@ -15,7 +15,7 @@ use rustc_middle::ty::{
self, suggest_constraining_type_param, AdtKind, DefIdTree, Infer, InferTy, ToPredicate, Ty,
TyCtxt, TypeFoldable, WithConstness,
};
use rustc_span::symbol::{kw, sym, Symbol};
use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_span::{MultiSpan, Span, DUMMY_SP};
use std::fmt;
@ -156,7 +156,7 @@ fn predicate_constraint(generics: &hir::Generics<'_>, pred: String) -> (Span, St
(
generics.where_clause.span_for_predicates_or_empty_place().shrink_to_hi(),
format!(
"{} {} ",
"{} {}",
if !generics.where_clause.predicates.is_empty() { "," } else { " where" },
pred,
),
@ -173,7 +173,13 @@ fn suggest_restriction(
fn_sig: Option<&hir::FnSig<'_>>,
projection: Option<&ty::ProjectionTy<'_>>,
trait_ref: ty::PolyTraitRef<'_>,
super_traits: Option<(&Ident, &hir::GenericBounds<'_>)>,
) {
// When we are dealing with a trait, `super_traits` will be `Some`:
// Given `trait T: A + B + C {}`
// - ^^^^^^^^^ GenericBounds
// |
// &Ident
let span = generics.where_clause.span_for_predicates_or_empty_place();
if span.from_expansion() || span.desugaring_kind().is_some() {
return;
@ -262,10 +268,28 @@ fn suggest_restriction(
);
} else {
// Trivial case: `T` needs an extra bound: `T: Bound`.
let (sp, sugg) =
predicate_constraint(generics, trait_ref.without_const().to_predicate().to_string());
let appl = Applicability::MachineApplicable;
err.span_suggestion(sp, &format!("consider further restricting {}", msg), sugg, appl);
let (sp, suggestion) = match super_traits {
None => {
predicate_constraint(generics, trait_ref.without_const().to_predicate().to_string())
}
Some((ident, bounds)) => match bounds {
[.., bound] => (
bound.span().shrink_to_hi(),
format!(" + {}", trait_ref.print_only_trait_path().to_string()),
),
[] => (
ident.span.shrink_to_hi(),
format!(": {}", trait_ref.print_only_trait_path().to_string()),
),
},
};
err.span_suggestion_verbose(
sp,
&format!("consider further restricting {}", msg),
suggestion,
Applicability::MachineApplicable,
);
}
}
@ -288,13 +312,35 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
let mut hir_id = body_id;
while let Some(node) = self.tcx.hir().find(hir_id) {
match node {
hir::Node::Item(hir::Item {
ident,
kind: hir::ItemKind::Trait(_, _, generics, bounds, _),
..
}) if self_ty == self.tcx.types.self_param => {
assert!(param_ty);
// Restricting `Self` for a single method.
suggest_restriction(
&generics,
"`Self`",
err,
None,
projection,
trait_ref,
Some((ident, bounds)),
);
return;
}
hir::Node::TraitItem(hir::TraitItem {
generics,
kind: hir::TraitItemKind::Fn(..),
..
}) if param_ty && self_ty == self.tcx.types.self_param => {
}) if self_ty == self.tcx.types.self_param => {
assert!(param_ty);
// Restricting `Self` for a single method.
suggest_restriction(&generics, "`Self`", err, None, projection, trait_ref);
suggest_restriction(
&generics, "`Self`", err, None, projection, trait_ref, None,
);
return;
}
@ -319,6 +365,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
Some(fn_sig),
projection,
trait_ref,
None,
);
return;
}
@ -336,6 +383,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
None,
projection,
trait_ref,
None,
);
return;
}

24
src/test/ui/associated-type-bounds/bad-bounds-on-assoc-in-trait.stderr
View File

@ -16,11 +16,13 @@ error[E0277]: `<<T as Case1>::C as std::iter::Iterator>::Item` is not an iterato
--> $DIR/bad-bounds-on-assoc-in-trait.rs:36:20
|
LL | fn assume_case1<T: Case1>() {
| ^^^^^ - help: consider further restricting the associated type: `where <<T as Case1>::C as std::iter::Iterator>::Item: std::iter::Iterator`
| |
| `<<T as Case1>::C as std::iter::Iterator>::Item` is not an iterator
| ^^^^^ `<<T as Case1>::C as std::iter::Iterator>::Item` is not an iterator
|
= help: the trait `std::iter::Iterator` is not implemented for `<<T as Case1>::C as std::iter::Iterator>::Item`
help: consider further restricting the associated type
|
LL | fn assume_case1<T: Case1>() where <<T as Case1>::C as std::iter::Iterator>::Item: std::iter::Iterator {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: `<<T as Case1>::C as std::iter::Iterator>::Item` cannot be sent between threads safely
--> $DIR/bad-bounds-on-assoc-in-trait.rs:36:20
@ -32,11 +34,13 @@ LL | Send + Iterator<Item:
| ---- required by this bound in `Case1`
...
LL | fn assume_case1<T: Case1>() {
| ^^^^^ - help: consider further restricting the associated type: `where <<T as Case1>::C as std::iter::Iterator>::Item: std::marker::Send`
| |
| `<<T as Case1>::C as std::iter::Iterator>::Item` cannot be sent between threads safely
| ^^^^^ `<<T as Case1>::C as std::iter::Iterator>::Item` cannot be sent between threads safely
|
= help: the trait `std::marker::Send` is not implemented for `<<T as Case1>::C as std::iter::Iterator>::Item`
help: consider further restricting the associated type
|
LL | fn assume_case1<T: Case1>() where <<T as Case1>::C as std::iter::Iterator>::Item: std::marker::Send {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: `<<T as Case1>::C as std::iter::Iterator>::Item` cannot be shared between threads safely
--> $DIR/bad-bounds-on-assoc-in-trait.rs:36:20
@ -48,11 +52,13 @@ LL | > + Sync>;
| ---- required by this bound in `Case1`
...
LL | fn assume_case1<T: Case1>() {
| ^^^^^ - help: consider further restricting the associated type: `where <<T as Case1>::C as std::iter::Iterator>::Item: std::marker::Sync`
| |
| `<<T as Case1>::C as std::iter::Iterator>::Item` cannot be shared between threads safely
| ^^^^^ `<<T as Case1>::C as std::iter::Iterator>::Item` cannot be shared between threads safely
|
= help: the trait `std::marker::Sync` is not implemented for `<<T as Case1>::C as std::iter::Iterator>::Item`
help: consider further restricting the associated type
|
LL | fn assume_case1<T: Case1>() where <<T as Case1>::C as std::iter::Iterator>::Item: std::marker::Sync {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: `<_ as Lam<&'a u8>>::App` doesn't implement `std::fmt::Debug`
--> $DIR/bad-bounds-on-assoc-in-trait.rs:36:20

2
src/test/ui/associated-types/associated-types-bound-failure.fixed
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@ -14,7 +14,7 @@ pub trait GetToInt
}
fn foo<G>(g: G) -> isize
where G : GetToInt, <G as GetToInt>::R: ToInt
where G : GetToInt, <G as GetToInt>::R: ToInt
{
ToInt::to_int(&g.get()) //~ ERROR E0277
}

8
src/test/ui/associated-types/associated-types-bound-failure.stderr
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@ -4,11 +4,13 @@ error[E0277]: the trait bound `<G as GetToInt>::R: ToInt` is not satisfied
LL | fn to_int(&self) -> isize;
| -------------------------- required by `ToInt::to_int`
...
LL | where G : GetToInt
| - help: consider further restricting the associated type: `, <G as GetToInt>::R: ToInt`
LL | {
LL | ToInt::to_int(&g.get())
| ^^^^^^^^ the trait `ToInt` is not implemented for `<G as GetToInt>::R`
|
help: consider further restricting the associated type
|
LL | where G : GetToInt, <G as GetToInt>::R: ToInt
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error

2
src/test/ui/associated-types/associated-types-for-unimpl-trait.fixed
View File

@ -7,7 +7,7 @@ trait Get {
}
trait Other {
fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get {}
fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get {}
//~^ ERROR the trait bound `Self: Get` is not satisfied
}

10
src/test/ui/associated-types/associated-types-for-unimpl-trait.stderr
View File

@ -2,10 +2,12 @@ error[E0277]: the trait bound `Self: Get` is not satisfied
--> $DIR/associated-types-for-unimpl-trait.rs:10:5
|
LL | fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-^^
| | |
| | help: consider further restricting `Self`: `where Self: Get`
| the trait `Get` is not implemented for `Self`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Get` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get {}
| ^^^^^^^^^^^^^^^
error: aborting due to previous error

10
src/test/ui/associated-types/associated-types-no-suitable-supertrait-2.stderr
View File

@ -2,10 +2,12 @@ error[E0277]: the trait bound `Self: Get` is not satisfied
--> $DIR/associated-types-no-suitable-supertrait-2.rs:17:5
|
LL | fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-^^
| | |
| | help: consider further restricting `Self`: `where Self: Get`
| the trait `Get` is not implemented for `Self`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Get` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get {}
| ^^^^^^^^^^^^^^^
error: aborting due to previous error

10
src/test/ui/associated-types/associated-types-no-suitable-supertrait.stderr
View File

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

2
src/test/ui/associated-types/associated-types-projection-to-unrelated-trait-in-method-without-default.fixed
View File

@ -7,7 +7,7 @@ trait Get {
}
trait Other {
fn okay<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get ;
fn okay<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get;
//~^ ERROR E0277
}

10
src/test/ui/associated-types/associated-types-projection-to-unrelated-trait-in-method-without-default.stderr
View File

@ -2,10 +2,12 @@ error[E0277]: the trait bound `Self: Get` is not satisfied
--> $DIR/associated-types-projection-to-unrelated-trait-in-method-without-default.rs:10:5
|
LL | fn okay<U:Get>(&self, foo: U, bar: <Self as Get>::Value);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
| | |
| | help: consider further restricting `Self`: `where Self: Get`
| the trait `Get` is not implemented for `Self`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Get` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | fn okay<U:Get>(&self, foo: U, bar: <Self as Get>::Value) where Self: Get;
| ^^^^^^^^^^^^^^^
error: aborting due to previous error

2
src/test/ui/associated-types/associated-types-unsized.fixed
View File

@ -6,7 +6,7 @@ trait Get {
fn get(&self) -> <Self as Get>::Value;
}
fn foo<T:Get>(t: T) where <T as Get>::Value: std::marker::Sized {
fn foo<T:Get>(t: T) where <T as Get>::Value: std::marker::Sized {
let x = t.get(); //~ ERROR the size for values of type
}

6
src/test/ui/associated-types/associated-types-unsized.stderr
View File

@ -1,8 +1,6 @@
error[E0277]: the size for values of type `<T as Get>::Value` cannot be known at compilation time
--> $DIR/associated-types-unsized.rs:10:9
|
LL | fn foo<T:Get>(t: T) {
| - help: consider further restricting the associated type: `where <T as Get>::Value: std::marker::Sized`
LL | let x = t.get();
| ^ doesn't have a size known at compile-time
|
@ -10,6 +8,10 @@ LL | let x = t.get();
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
= note: all local variables must have a statically known size
= help: unsized locals are gated as an unstable feature
help: consider further restricting the associated type
|
LL | fn foo<T:Get>(t: T) where <T as Get>::Value: std::marker::Sized {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error

16
src/test/ui/associated-types/defaults-suitability.stderr
View File

@ -85,25 +85,29 @@ error[E0277]: the trait bound `<Self as Foo2<T>>::Baz: std::clone::Clone` is not
--> $DIR/defaults-suitability.rs:72:15
|
LL | trait Foo2<T> {
| -------------- help: consider further restricting the associated type: `where <Self as Foo2<T>>::Baz: std::clone::Clone`
| |
| required by `Foo2`
| ------------- required by `Foo2`
LL | type Bar: Clone = Vec<Self::Baz>;
| ^^^^^ the trait `std::clone::Clone` is not implemented for `<Self as Foo2<T>>::Baz`
|
= note: required because of the requirements on the impl of `std::clone::Clone` for `std::vec::Vec<<Self as Foo2<T>>::Baz>`
help: consider further restricting the associated type
|
LL | trait Foo2<T> where <Self as Foo2<T>>::Baz: std::clone::Clone {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: the trait bound `<Self as Foo25<T>>::Baz: std::clone::Clone` is not satisfied
--> $DIR/defaults-suitability.rs:81:15
|
LL | trait Foo25<T: Clone> {
| ---------------------- help: consider further restricting the associated type: `where <Self as Foo25<T>>::Baz: std::clone::Clone`
| |
| required by `Foo25`
| --------------------- required by `Foo25`
LL | type Bar: Clone = Vec<Self::Baz>;
| ^^^^^ the trait `std::clone::Clone` is not implemented for `<Self as Foo25<T>>::Baz`
|
= note: required because of the requirements on the impl of `std::clone::Clone` for `std::vec::Vec<<Self as Foo25<T>>::Baz>`
help: consider further restricting the associated type
|
LL | trait Foo25<T: Clone> where <Self as Foo25<T>>::Baz: std::clone::Clone {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: the trait bound `T: std::clone::Clone` is not satisfied
--> $DIR/defaults-suitability.rs:90:16

18
src/test/ui/associated-types/defaults-unsound-62211-1.stderr
View File

@ -6,6 +6,11 @@ LL | trait UncheckedCopy: Sized {
...
LL | type Output: Copy
| ^^^^ the trait `std::marker::Copy` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | trait UncheckedCopy: Sized + std::marker::Copy {
| ^^^^^^^^^^^^^^^^^^^
error[E0277]: cannot add-assign `&'static str` to `Self`
--> $DIR/defaults-unsound-62211-1.rs:25:7
@ -17,6 +22,10 @@ LL | + AddAssign<&'static str>
| ^^^^^^^^^^^^^^^^^^^^^^^ no implementation for `Self += &'static str`
|
= help: the trait `std::ops::AddAssign<&'static str>` is not implemented for `Self`
help: consider further restricting `Self`
|
LL | trait UncheckedCopy: Sized + std::ops::AddAssign<&'static str> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: the trait bound `Self: std::ops::Deref` is not satisfied
--> $DIR/defaults-unsound-62211-1.rs:23:7
@ -26,6 +35,11 @@ LL | trait UncheckedCopy: Sized {
...
LL | + Deref<Target = str>
| ^^^^^^^^^^^^^^^^^^^ the trait `std::ops::Deref` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | trait UncheckedCopy: Sized + std::ops::Deref {
| ^^^^^^^^^^^^^^^^^
error[E0277]: `Self` doesn't implement `std::fmt::Display`
--> $DIR/defaults-unsound-62211-1.rs:28:7
@ -38,6 +52,10 @@ LL | + Display = Self;
|
= help: the trait `std::fmt::Display` is not implemented for `Self`
= note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
help: consider further restricting `Self`
|
LL | trait UncheckedCopy: Sized + std::fmt::Display {
| ^^^^^^^^^^^^^^^^^^^
error[E0277]: `T` doesn't implement `std::fmt::Display`
--> $DIR/defaults-unsound-62211-1.rs:41:9

18
src/test/ui/associated-types/defaults-unsound-62211-2.stderr
View File

@ -6,6 +6,11 @@ LL | trait UncheckedCopy: Sized {
...
LL | type Output: Copy
| ^^^^ the trait `std::marker::Copy` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | trait UncheckedCopy: Sized + std::marker::Copy {
| ^^^^^^^^^^^^^^^^^^^
error[E0277]: cannot add-assign `&'static str` to `Self`
--> $DIR/defaults-unsound-62211-2.rs:25:7
@ -17,6 +22,10 @@ LL | + AddAssign<&'static str>
| ^^^^^^^^^^^^^^^^^^^^^^^ no implementation for `Self += &'static str`
|
= help: the trait `std::ops::AddAssign<&'static str>` is not implemented for `Self`
help: consider further restricting `Self`
|
LL | trait UncheckedCopy: Sized + std::ops::AddAssign<&'static str> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: the trait bound `Self: std::ops::Deref` is not satisfied
--> $DIR/defaults-unsound-62211-2.rs:23:7
@ -26,6 +35,11 @@ LL | trait UncheckedCopy: Sized {
...
LL | + Deref<Target = str>
| ^^^^^^^^^^^^^^^^^^^ the trait `std::ops::Deref` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | trait UncheckedCopy: Sized + std::ops::Deref {
| ^^^^^^^^^^^^^^^^^
error[E0277]: `Self` doesn't implement `std::fmt::Display`
--> $DIR/defaults-unsound-62211-2.rs:28:7
@ -38,6 +52,10 @@ LL | + Display = Self;
|
= help: the trait `std::fmt::Display` is not implemented for `Self`
= note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
help: consider further restricting `Self`
|
LL | trait UncheckedCopy: Sized + std::fmt::Display {
| ^^^^^^^^^^^^^^^^^^^
error[E0277]: `T` doesn't implement `std::fmt::Display`
--> $DIR/defaults-unsound-62211-2.rs:41:9

4
src/test/ui/associated-types/issue-63593.stderr
View File

@ -8,6 +8,10 @@ LL | type This = Self;
|
= help: the trait `std::marker::Sized` is not implemented for `Self`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
help: consider further restricting `Self`
|
LL | trait MyTrait: std::marker::Sized {
| ^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error

11
src/test/ui/associated-types/trait-with-supertraits-needing-sized-self.rs Normal file
View File

@ -0,0 +1,11 @@
use std::ops::{Add, Sub, Mul, Div};
trait ArithmeticOps: Add<Output=Self> + Sub<Output=Self> + Mul<Output=Self> + Div<Output=Self> {}
//~^ ERROR the size for values of type `Self` cannot be known at compilation time
impl<T> ArithmeticOps for T where T: Add<Output=T> + Sub<Output=T> + Mul<Output=T> + Div<Output=T> {
// Nothing to implement, since T already supports the other traits.
// It has the functions it needs already
}
fn main() {}

21
src/test/ui/associated-types/trait-with-supertraits-needing-sized-self.stderr Normal file
View File

@ -0,0 +1,21 @@
error[E0277]: the size for values of type `Self` cannot be known at compilation time
--> $DIR/trait-with-supertraits-needing-sized-self.rs:3:22
|
LL | trait ArithmeticOps: Add<Output=Self> + Sub<Output=Self> + Mul<Output=Self> + Div<Output=Self> {}
| ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
::: $SRC_DIR/libcore/ops/arith.rs:LL:COL
|
LL | pub trait Add<Rhs = Self> {
| --- required by this bound in `std::ops::Add`
|
= help: the trait `std::marker::Sized` is not implemented for `Self`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
help: consider further restricting `Self`
|
LL | trait ArithmeticOps: Add<Output=Self> + Sub<Output=Self> + Mul<Output=Self> + Div<Output=Self> + std::marker::Sized {}
| ^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.

2
src/test/ui/issues/issue-20005.stderr
View File

@ -11,7 +11,7 @@ LL | ) -> <Dst as From<Self>>::Result where Dst: From<Self> {
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
help: consider further restricting `Self`
|
LL | ) -> <Dst as From<Self>>::Result where Dst: From<Self>, Self: std::marker::Sized {
LL | ) -> <Dst as From<Self>>::Result where Dst: From<Self>, Self: std::marker::Sized {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
help: consider relaxing the implicit `Sized` restriction
|

6
src/test/ui/issues/issue-22872.stderr
View File

@ -1,14 +1,16 @@
error[E0277]: `<P as Process<'_>>::Item` is not an iterator
--> $DIR/issue-22872.rs:20:40
|
LL | fn push_process<P>(process: P) where P: Process<'static> {
| - help: consider further restricting the associated type: `, <P as Process<'_>>::Item: std::iter::Iterator`
LL | let _: Box<dyn for<'b> Wrap<'b>> = Box::new(Wrapper(process));
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ `<P as Process<'_>>::Item` is not an iterator
|
= help: the trait `std::iter::Iterator` is not implemented for `<P as Process<'_>>::Item`
= note: required because of the requirements on the impl of `for<'b> Wrap<'b>` for `Wrapper<P>`
= note: required for the cast to the object type `dyn for<'b> Wrap<'b>`
help: consider further restricting the associated type
|
LL | fn push_process<P>(process: P) where P: Process<'static>, <P as Process<'_>>::Item: std::iter::Iterator {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error

8
src/test/ui/issues/issue-27078.stderr
View File

@ -2,14 +2,16 @@ error[E0277]: the size for values of type `Self` cannot be known at compilation
--> $DIR/issue-27078.rs:5:12
|
LL | fn foo(self) -> &'static i32 {
| ^^^^ - help: consider further restricting `Self`: `where Self: std::marker::Sized`
| |
| doesn't have a size known at compile-time
| ^^^^ doesn't have a size known at compile-time
|
= help: the trait `std::marker::Sized` is not implemented for `Self`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
= note: all local variables must have a statically known size
= help: unsized locals are gated as an unstable feature
help: consider further restricting `Self`
|
LL | fn foo(self) -> &'static i32 where Self: std::marker::Sized {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error

8
src/test/ui/issues/issue-42312.stderr
View File

@ -2,14 +2,16 @@ error[E0277]: the size for values of type `<Self as std::ops::Deref>::Target` ca
--> $DIR/issue-42312.rs:4:12
|
LL | fn baz(_: Self::Target) where Self: Deref {}
| ^ - help: consider further restricting the associated type: `, <Self as std::ops::Deref>::Target: std::marker::Sized`
| |
| doesn't have a size known at compile-time
| ^ doesn't have a size known at compile-time
|
= help: the trait `std::marker::Sized` is not implemented for `<Self as std::ops::Deref>::Target`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
= note: all function arguments must have a statically known size
= help: unsized locals are gated as an unstable feature
help: consider further restricting the associated type
|
LL | fn baz(_: Self::Target) where Self: Deref, <Self as std::ops::Deref>::Target: std::marker::Sized {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: the size for values of type `(dyn std::string::ToString + 'static)` cannot be known at compilation time
--> $DIR/issue-42312.rs:8:10

10
src/test/ui/suggestions/impl-trait-with-missing-bounds.stderr
View File

@ -10,7 +10,7 @@ LL | fn qux(_: impl std::fmt::Debug) {}
= help: the trait `std::fmt::Debug` is not implemented for `<impl Iterator as std::iter::Iterator>::Item`
help: introduce a type parameter with a trait bound instead of using `impl Trait`
|
LL | fn foo<I: Iterator>(constraints: I) where <I as std::iter::Iterator>::Item: std::fmt::Debug {
LL | fn foo<I: Iterator>(constraints: I) where <I as std::iter::Iterator>::Item: std::fmt::Debug {
| ^^^^^^^^^^^^^ ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: `<impl Iterator as std::iter::Iterator>::Item` doesn't implement `std::fmt::Debug`
@ -25,7 +25,7 @@ LL | fn qux(_: impl std::fmt::Debug) {}
= help: the trait `std::fmt::Debug` is not implemented for `<impl Iterator as std::iter::Iterator>::Item`
help: introduce a type parameter with a trait bound instead of using `impl Trait`
|
LL | fn bar<T, I: Iterator>(t: T, constraints: I) where T: std::fmt::Debug, <I as std::iter::Iterator>::Item: std::fmt::Debug {
LL | fn bar<T, I: Iterator>(t: T, constraints: I) where T: std::fmt::Debug, <I as std::iter::Iterator>::Item: std::fmt::Debug {
| ^^^^^^^^^^^^^ ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: `<impl Iterator as std::iter::Iterator>::Item` doesn't implement `std::fmt::Debug`
@ -40,7 +40,7 @@ LL | fn qux(_: impl std::fmt::Debug) {}
= help: the trait `std::fmt::Debug` is not implemented for `<impl Iterator as std::iter::Iterator>::Item`
help: introduce a type parameter with a trait bound instead of using `impl Trait`
|
LL | fn baz<I: Iterator>(t: impl std::fmt::Debug, constraints: I) where <I as std::iter::Iterator>::Item: std::fmt::Debug {
LL | fn baz<I: Iterator>(t: impl std::fmt::Debug, constraints: I) where <I as std::iter::Iterator>::Item: std::fmt::Debug {
| ^^^^^^^^^^^^^ ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: `<impl Iterator as std::iter::Iterator>::Item` doesn't implement `std::fmt::Debug`
@ -55,7 +55,7 @@ LL | fn qux(_: impl std::fmt::Debug) {}
= help: the trait `std::fmt::Debug` is not implemented for `<impl Iterator as std::iter::Iterator>::Item`
help: introduce a type parameter with a trait bound instead of using `impl Trait`
|
LL | fn bat<I, T: std::fmt::Debug, U: Iterator>(t: T, constraints: U, _: I) where <U as std::iter::Iterator>::Item: std::fmt::Debug {
LL | fn bat<I, T: std::fmt::Debug, U: Iterator>(t: T, constraints: U, _: I) where <U as std::iter::Iterator>::Item: std::fmt::Debug {
| ^^^^^^^^^^^^^ ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: `<impl Iterator + std::fmt::Debug as std::iter::Iterator>::Item` doesn't implement `std::fmt::Debug`
@ -70,7 +70,7 @@ LL | fn qux(_: impl std::fmt::Debug) {}
= help: the trait `std::fmt::Debug` is not implemented for `<impl Iterator + std::fmt::Debug as std::iter::Iterator>::Item`
help: introduce a type parameter with a trait bound instead of using `impl Trait`
|
LL | fn bak<I: Iterator + std::fmt::Debug>(constraints: I) where <I as std::iter::Iterator>::Item: std::fmt::Debug {
LL | fn bak<I: Iterator + std::fmt::Debug>(constraints: I) where <I as std::iter::Iterator>::Item: std::fmt::Debug {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 5 previous errors

24
src/test/ui/suggestions/missing-assoc-type-bound-restriction.stderr
View File

@ -8,9 +8,12 @@ LL | type Assoc: Child<Self::Ty>;
| --------------- required by this bound in `Parent`
...
LL | impl<A, T: Parent<Ty = A>> Parent for ParentWrapper<T> {
| ^^^^^^ - help: consider further restricting the associated type: `where <T as Parent>::Assoc: Child<A>`
| |
| the trait `Child<A>` is not implemented for `<T as Parent>::Assoc`
| ^^^^^^ the trait `Child<A>` is not implemented for `<T as Parent>::Assoc`
|
help: consider further restricting the associated type
|
LL | impl<A, T: Parent<Ty = A>> Parent for ParentWrapper<T> where <T as Parent>::Assoc: Child<A> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: the trait bound `<T as Parent>::Assoc: Child<A>` is not satisfied
--> $DIR/missing-assoc-type-bound-restriction.rs:20:18
@ -21,13 +24,14 @@ LL | type Ty;
LL | type Assoc: Child<Self::Ty>;
| --------------- required by this bound in `Parent`
...
LL | impl<A, T: Parent<Ty = A>> Parent for ParentWrapper<T> {
| - help: consider further restricting the associated type: `where <T as Parent>::Assoc: Child<A>`
...
LL | type Assoc = ChildWrapper<T::Assoc>;
| ^^^^^^^^^^^^^^^^^^^^^^ the trait `Child<A>` is not implemented for `<T as Parent>::Assoc`
|
= note: required because of the requirements on the impl of `Child<A>` for `ChildWrapper<<T as Parent>::Assoc>`
help: consider further restricting the associated type
|
LL | impl<A, T: Parent<Ty = A>> Parent for ParentWrapper<T> where <T as Parent>::Assoc: Child<A> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: the trait bound `<T as Parent>::Assoc: Child<A>` is not satisfied
--> $DIR/missing-assoc-type-bound-restriction.rs:20:5
@ -38,11 +42,13 @@ LL | type Ty;
LL | type Assoc: Child<Self::Ty>;
| --------------- required by this bound in `Parent`
...
LL | impl<A, T: Parent<Ty = A>> Parent for ParentWrapper<T> {
| - help: consider further restricting the associated type: `where <T as Parent>::Assoc: Child<A>`
...
LL | type Assoc = ChildWrapper<T::Assoc>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Child<A>` is not implemented for `<T as Parent>::Assoc`
|
help: consider further restricting the associated type
|
LL | impl<A, T: Parent<Ty = A>> Parent for ParentWrapper<T> where <T as Parent>::Assoc: Child<A> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 3 previous errors

14
src/test/ui/type/type-params-in-different-spaces-2.stderr
View File

@ -4,10 +4,13 @@ error[E0277]: the trait bound `Self: Tr<U>` is not satisfied
LL | fn op(_: T) -> Self;
| -------------------- required by `Tr::op`
...
LL | fn test<U>(u: U) -> Self {
| - help: consider further restricting `Self`: `where Self: Tr<U>`
LL | Tr::op(u)
| ^^^^^^ the trait `Tr<U>` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | fn test<U>(u: U) -> Self where Self: Tr<U> {
| ^^^^^^^^^^^^^^^^^
error[E0277]: the trait bound `Self: Tr<U>` is not satisfied
--> $DIR/type-params-in-different-spaces-2.rs:16:9
@ -15,10 +18,13 @@ error[E0277]: the trait bound `Self: Tr<U>` is not satisfied
LL | fn op(_: T) -> Self;
| -------------------- required by `Tr::op`
...
LL | fn test<U>(u: U) -> Self {
| - help: consider further restricting `Self`: `where Self: Tr<U>`
LL | Tr::op(u)
| ^^^^^^ the trait `Tr<U>` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | fn test<U>(u: U) -> Self where Self: Tr<U> {
| ^^^^^^^^^^^^^^^^^
error: aborting due to 2 previous errors

2
src/test/ui/typeck/typeck-default-trait-impl-assoc-type.fixed
View File

@ -7,7 +7,7 @@ trait Trait {
type AssocType;
fn dummy(&self) { }
}
fn bar<T:Trait+Send>() where <T as Trait>::AssocType: std::marker::Send {
fn bar<T:Trait+Send>() where <T as Trait>::AssocType: std::marker::Send {
is_send::<T::AssocType>(); //~ ERROR E0277
}

6
src/test/ui/typeck/typeck-default-trait-impl-assoc-type.stderr
View File

@ -1,8 +1,6 @@
error[E0277]: `<T as Trait>::AssocType` cannot be sent between threads safely
--> $DIR/typeck-default-trait-impl-assoc-type.rs:11:5
|
LL | fn bar<T:Trait+Send>() {
| - help: consider further restricting the associated type: `where <T as Trait>::AssocType: std::marker::Send`
LL | is_send::<T::AssocType>();
| ^^^^^^^^^^^^^^^^^^^^^^^ `<T as Trait>::AssocType` cannot be sent between threads safely
...
@ -10,6 +8,10 @@ LL | fn is_send<T:Send>() {
| ---- required by this bound in `is_send`
|
= help: the trait `std::marker::Send` is not implemented for `<T as Trait>::AssocType`
help: consider further restricting the associated type
|
LL | fn bar<T:Trait+Send>() where <T as Trait>::AssocType: std::marker::Send {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error

10
src/test/ui/wf/wf-trait-associated-type-trait.stderr
View File

@ -3,12 +3,14 @@ error[E0277]: the trait bound `<Self as SomeTrait>::Type1: std::marker::Copy` is
|
LL | struct IsCopy<T:Copy> { x: T }
| ---- required by this bound in `IsCopy`
LL |
LL | trait SomeTrait {
| - help: consider further restricting the associated type: `where <Self as SomeTrait>::Type1: std::marker::Copy`
LL | type Type1;
...
LL | type Type2 = IsCopy<Self::Type1>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::marker::Copy` is not implemented for `<Self as SomeTrait>::Type1`
|
help: consider further restricting the associated type
|
LL | trait SomeTrait where <Self as SomeTrait>::Type1: std::marker::Copy {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error

9
src/test/ui/wf/wf-trait-default-fn-arg.stderr
View File

@ -5,9 +5,12 @@ LL | struct Bar<T:Eq+?Sized> { value: Box<T> }
| -- required by this bound in `Bar`
...
LL | fn bar(&self, x: &Bar<Self>) {
| ^^^^^^^^^^ - help: consider further restricting `Self`: `where Self: std::cmp::Eq`
| |
| the trait `std::cmp::Eq` is not implemented for `Self`
| ^^^^^^^^^^ the trait `std::cmp::Eq` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | fn bar(&self, x: &Bar<Self>) where Self: std::cmp::Eq {
| ^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error

9
src/test/ui/wf/wf-trait-default-fn-ret.stderr
View File

@ -5,9 +5,12 @@ LL | struct Bar<T:Eq+?Sized> { value: Box<T> }
| -- required by this bound in `Bar`
...
LL | fn bar(&self) -> Bar<Self> {
| ^^^^^^^^^- help: consider further restricting `Self`: `where Self: std::cmp::Eq`
| |
| the trait `std::cmp::Eq` is not implemented for `Self`
| ^^^^^^^^^ the trait `std::cmp::Eq` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | fn bar(&self) -> Bar<Self> where Self: std::cmp::Eq {
| ^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error

9
src/test/ui/wf/wf-trait-default-fn-where-clause.stderr
View File

@ -5,9 +5,12 @@ LL | trait Bar<T:Eq+?Sized> { }
| -- required by this bound in `Bar`
...
LL | fn bar<A>(&self) where A: Bar<Self> {
| ^^^^^^^^^- help: consider further restricting `Self`: `, Self: std::cmp::Eq`
| |
| the trait `std::cmp::Eq` is not implemented for `Self`
| ^^^^^^^^^ the trait `std::cmp::Eq` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | fn bar<A>(&self) where A: Bar<Self>, Self: std::cmp::Eq {
| ^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error

9
src/test/ui/wf/wf-trait-fn-arg.stderr
View File

@ -5,9 +5,12 @@ LL | struct Bar<T:Eq+?Sized> { value: Box<T> }
| -- required by this bound in `Bar`
...
LL | fn bar(&self, x: &Bar<Self>);
| ^^^^^^^^^^ - help: consider further restricting `Self`: `where Self: std::cmp::Eq`
| |
| the trait `std::cmp::Eq` is not implemented for `Self`
| ^^^^^^^^^^ the trait `std::cmp::Eq` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | fn bar(&self, x: &Bar<Self>) where Self: std::cmp::Eq;
| ^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error

9
src/test/ui/wf/wf-trait-fn-ret.stderr
View File

@ -5,9 +5,12 @@ LL | struct Bar<T:Eq+?Sized> { value: Box<T> }
| -- required by this bound in `Bar`
...
LL | fn bar(&self) -> &Bar<Self>;
| ^^^^^^^^^^- help: consider further restricting `Self`: `where Self: std::cmp::Eq`
| |
| the trait `std::cmp::Eq` is not implemented for `Self`
| ^^^^^^^^^^ the trait `std::cmp::Eq` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | fn bar(&self) -> &Bar<Self> where Self: std::cmp::Eq;
| ^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error

9
src/test/ui/wf/wf-trait-fn-where-clause.stderr
View File

@ -5,9 +5,12 @@ LL | struct Bar<T:Eq+?Sized> { value: Box<T> }
| -- required by this bound in `Bar`
...
LL | fn bar(&self) where Self: Sized, Bar<Self>: Copy;
| ^^^^- help: consider further restricting `Self`: `, Self: std::cmp::Eq`
| |
| the trait `std::cmp::Eq` is not implemented for `Self`
| ^^^^ the trait `std::cmp::Eq` is not implemented for `Self`
|
help: consider further restricting `Self`
|
LL | fn bar(&self) where Self: Sized, Bar<Self>: Copy, Self: std::cmp::Eq;
| ^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error