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

Provide help when T: ?Sized can't be suggested

Browse source
This commit is contained in:
Esteban Küber 2020-06-16 17:24:16 -07:00
parent d2b8e6090c
commit aa84b0fa37
10 changed files with 154 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

7
src/test/ui/issues/issue-18919.stderr
View file

@ -9,6 +9,13 @@ LL | enum Option<T> {
|
= help: the trait `std::marker::Sized` is not implemented for `dyn for<'r> std::ops::Fn(&'r isize) -> isize`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
--> $DIR/issue-18919.rs:7:13
|
LL | enum Option<T> {
| ^ this could be changed to `T: ?Sized`...
LL | Some(T),
| - ...if indirection was used here: `Box<T>`
error: aborting due to previous error

7
src/test/ui/issues/issue-23281.stderr
View file

@ -9,6 +9,13 @@ LL | struct Vec<T> {
|
= help: the trait `std::marker::Sized` is not implemented for `(dyn std::ops::Fn() + 'static)`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
--> $DIR/issue-23281.rs:8:12
|
LL | struct Vec<T> {
| ^ this could be changed to `T: ?Sized`...
LL | t: T,
| - ...if indirection was used here: `Box<T>`
error: aborting due to previous error

11
src/test/ui/suggestions/adt-param-with-implicit-sized-bound.rs
View file

@ -2,6 +2,7 @@ trait Trait {
fn func1() -> Struct1<Self>; //~ ERROR E0277
fn func2<'a>() -> Struct2<'a, Self>; //~ ERROR E0277
fn func3() -> Struct3<Self>; //~ ERROR E0277
fn func4() -> Struct4<Self>; //~ ERROR E0277
}
struct Struct1<T>{
@ -14,4 +15,14 @@ struct Struct3<T>{
_t: T,
}
struct X<T>(T);
struct Struct4<T>{
_t: X<T>,
}
struct Struct5<T: ?Sized>{
_t: X<T>, //~ ERROR E0277
}
fn main() {}

50
src/test/ui/suggestions/adt-param-with-implicit-sized-bound.stderr
View file

@ -1,3 +1,24 @@
error[E0277]: the size for values of type `T` cannot be known at compilation time
--> $DIR/adt-param-with-implicit-sized-bound.rs:25:5
|
LL | struct X<T>(T);
| - required by this bound in `X`
...
LL | struct Struct5<T: ?Sized>{
| - this type parameter needs to be `std::marker::Sized`
LL | _t: X<T>,
| ^^^^^^^^ doesn't have a size known at compile-time
|
= help: the trait `std::marker::Sized` is not implemented for `T`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
--> $DIR/adt-param-with-implicit-sized-bound.rs:18:10
|
LL | struct X<T>(T);
| ^ - ...if indirection was used here: `Box<T>`
| |
| this could be changed to `T: ?Sized`...
error[E0277]: the size for values of type `Self` cannot be known at compilation time
--> $DIR/adt-param-with-implicit-sized-bound.rs:2:19
|
@ -49,11 +70,38 @@ LL | struct Struct3<T>{
|
= 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: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
--> $DIR/adt-param-with-implicit-sized-bound.rs:14:16
|
LL | struct Struct3<T>{
| ^ this could be changed to `T: ?Sized`...
LL | _t: T,
| - ...if indirection was used here: `Box<T>`
help: consider further restricting `Self`
|
LL | fn func3() -> Struct3<Self> where Self: std::marker::Sized;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 3 previous errors
error[E0277]: the size for values of type `Self` cannot be known at compilation time
--> $DIR/adt-param-with-implicit-sized-bound.rs:5:19
|
LL | fn func4() -> Struct4<Self>;
| ^^^^^^^^^^^^^ doesn't have a size known at compile-time
...
LL | struct Struct4<T>{
| - required by this bound in `Struct4`
|
= 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 | fn func4() -> Struct4<Self> where Self: std::marker::Sized;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: consider relaxing the implicit `Sized` restriction
|
LL | struct Struct4<T: ?Sized>{
| ^^^^^^^^
error: aborting due to 5 previous errors
For more information about this error, try `rustc --explain E0277`.

7
src/test/ui/unsized/unsized-enum.stderr
View file

@ -11,6 +11,13 @@ LL | fn foo2<T: ?Sized>() { not_sized::<Foo<T>>() }
|
= help: the trait `std::marker::Sized` is not implemented for `T`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
help: you could relax the implicit `Sized` bound on `U` if it were used through indirection like `&U` or `Box<U>`
--> $DIR/unsized-enum.rs:4:10
|
LL | enum Foo<U> { FooSome(U), FooNone }
| ^ - ...if indirection was used here: `Box<U>`
| |
| this could be changed to `U: ?Sized`...
error: aborting due to previous error

7
src/test/ui/unsized/unsized-inherent-impl-self-type.stderr
View file

@ -11,6 +11,13 @@ LL | impl<X: ?Sized> S5<X> {
|
= help: the trait `std::marker::Sized` is not implemented for `X`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
help: you could relax the implicit `Sized` bound on `Y` if it were used through indirection like `&Y` or `Box<Y>`
--> $DIR/unsized-inherent-impl-self-type.rs:5:11
|
LL | struct S5<Y>(Y);
| ^ - ...if indirection was used here: `Box<Y>`
| |
| this could be changed to `Y: ?Sized`...
error: aborting due to previous error

7
src/test/ui/unsized/unsized-struct.stderr
View file

@ -11,6 +11,13 @@ LL | fn foo2<T: ?Sized>() { not_sized::<Foo<T>>() }
|
= help: the trait `std::marker::Sized` is not implemented for `T`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
--> $DIR/unsized-struct.rs:4:12
|
LL | struct Foo<T> { data: T }
| ^ - ...if indirection was used here: `Box<T>`
| |
| this could be changed to `T: ?Sized`...
error[E0277]: the size for values of type `T` cannot be known at compilation time
--> $DIR/unsized-struct.rs:13:24

7
src/test/ui/unsized/unsized-trait-impl-self-type.stderr
View file

@ -11,6 +11,13 @@ LL | impl<X: ?Sized> T3<X> for S5<X> {
|
= help: the trait `std::marker::Sized` is not implemented for `X`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
help: you could relax the implicit `Sized` bound on `Y` if it were used through indirection like `&Y` or `Box<Y>`
--> $DIR/unsized-trait-impl-self-type.rs:8:11
|
LL | struct S5<Y>(Y);
| ^ - ...if indirection was used here: `Box<Y>`
| |
| this could be changed to `Y: ?Sized`...
error: aborting due to previous error

7
src/test/ui/wf/wf-fn-where-clause.stderr
View file

@ -23,6 +23,13 @@ LL | struct Vec<T> {
|
= help: the trait `std::marker::Sized` is not implemented for `(dyn std::marker::Copy + 'static)`
= note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
--> $DIR/wf-fn-where-clause.rs:16:12
|
LL | struct Vec<T> {
| ^ this could be changed to `T: ?Sized`...
LL | t: T,
| - ...if indirection was used here: `Box<T>`
error[E0038]: the trait `std::marker::Copy` cannot be made into an object
--> $DIR/wf-fn-where-clause.rs:12:16