user0/rust
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Point at reason in object unsafe trait with Self in supertraits or where-clause

Browse source
This commit is contained in:
Esteban Küber 2020-02-02 12:51:30 -08:00
parent 16d935e725
commit 865216b3ad
8 changed files with 78 additions and 30 deletions
Download patch file Download diff file Expand all files Collapse all files

7
src/test/ui/issues/issue-26056.stderr
View file

@ -1,10 +1,13 @@
error[E0038]: the trait `Map` cannot be made into an object
--> $DIR/issue-26056.rs:20:13
|
LL | trait Map: MapLookup<<Self as Map>::Key> {
| --- ----------------------------- ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
...
LL | as &dyn Map<Key=u32,MapValue=u32>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Map` cannot be made into an object
|
= note: the trait cannot be made into an object because it cannot use `Self` as a type parameter in the supertraits or `where`-clauses
error: aborting due to previous error

9
src/test/ui/issues/issue-28576.stderr
View file

@ -1,11 +1,16 @@
error[E0038]: the trait `Bar` cannot be made into an object
--> $DIR/issue-28576.rs:7:12
|
LL | pub trait Bar: Foo<Assoc=()> {
| --- -------------
| | | |
| | | ...because it uses `Self` as a type parameter in this
| | ...because it uses `Self` as a type parameter in this
| this trait cannot be made into an object...
LL | fn new(&self, b: &
LL | / dyn Bar
LL | | <Assoc=()>
| |________________________^ the trait `Bar` cannot be made into an object
|
= note: the trait cannot be made into an object because it cannot use `Self` as a type parameter in the supertraits or `where`-clauses
error: aborting due to previous error

6
src/test/ui/issues/issue-38404.stderr
View file

@ -1,10 +1,12 @@
error[E0038]: the trait `B` cannot be made into an object
--> $DIR/issue-38404.rs:3:15
|
LL | trait A<T>: std::ops::Add<Self> + Sized {}
| ------------------- ...because it uses `Self` as a type parameter in this
LL | trait B<T>: A<T> {}
| - this trait cannot be made into an object...
LL | trait C<T>: A<dyn B<T, Output=usize>> {}
| ^^^^^^^^^^^^^^^^^^^^^^ the trait `B` cannot be made into an object
|
= note: the trait cannot be made into an object because it cannot use `Self` as a type parameter in the supertraits or `where`-clauses
error: aborting due to previous error

13
src/test/ui/issues/issue-38604.stderr
View file

@ -1,18 +1,25 @@
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/issue-38604.rs:14:13
|
LL | trait Foo where u32: Q<Self> {
| --- ------- ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
...
LL | let _f: Box<dyn Foo> =
| ^^^^^^^^^^^^ the trait `Foo` cannot be made into an object
|
= note: the trait cannot be made into an object because it cannot use `Self` as a type parameter in the supertraits or `where`-clauses
error[E0038]: the trait `Foo` cannot be made into an object
--> $DIR/issue-38604.rs:15:9
|
LL | trait Foo where u32: Q<Self> {
| --- ------- ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
...
LL | Box::new(());
| ^^^^^^^^^^^^ the trait `Foo` cannot be made into an object
|
= note: the trait cannot be made into an object because it cannot use `Self` as a type parameter in the supertraits or `where`-clauses
= note: required because of the requirements on the impl of `std::ops::CoerceUnsized<std::boxed::Box<dyn Foo>>` for `std::boxed::Box<()>`
= note: required by cast to type `std::boxed::Box<dyn Foo>`

7
src/test/ui/object-safety/object-safety-issue-22040.stderr
View file

@ -1,10 +1,13 @@
error[E0038]: the trait `Expr` cannot be made into an object
--> $DIR/object-safety-issue-22040.rs:12:23
|
LL | trait Expr: Debug + PartialEq {
| ---- --------- ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
...
LL | elements: Vec<Box<dyn Expr + 'x>>,
| ^^^^^^^^^^^^^ the trait `Expr` cannot be made into an object
|
= note: the trait cannot be made into an object because it cannot use `Self` as a type parameter in the supertraits or `where`-clauses
error: aborting due to previous error

7
src/test/ui/object-safety/object-safety-supertrait-mentions-Self.stderr
View file

@ -1,10 +1,13 @@
error[E0038]: the trait `Baz` cannot be made into an object
--> $DIR/object-safety-supertrait-mentions-Self.rs:15:31
|
LL | trait Baz : Bar<Self> {
| --- --------- ...because it uses `Self` as a type parameter in this
| |
| this trait cannot be made into an object...
...
LL | fn make_baz<T:Baz>(t: &T) -> &dyn Baz {
| ^^^^^^^ the trait `Baz` cannot be made into an object
|
= note: the trait cannot be made into an object because it cannot use `Self` as a type parameter in the supertraits or `where`-clauses
error: aborting due to previous error

5
src/test/ui/traits/trait-alias/trait-alias-object-fail.stderr
View file

@ -3,8 +3,11 @@ error[E0038]: the trait `std::cmp::Eq` cannot be made into an object
|
LL | let _: &dyn EqAlias = &123;
| ^^^^^^^^^^^ the trait `std::cmp::Eq` cannot be made into an object
|
::: $SRC_DIR/libcore/cmp.rs:LL:COL
|
= note: the trait cannot be made into an object because it cannot use `Self` as a type parameter in the supertraits or `where`-clauses
LL | pub trait Eq: PartialEq<Self> {
| --------------- the trait cannot be made into an object because it uses `Self` as a type parameter in this
error[E0191]: the value of the associated type `Item` (from trait `std::iter::Iterator`) must be specified
--> $DIR/trait-alias-object-fail.rs:9:17