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5b54286640
Remove the "which is required by `{root_obligation}`" post-script in
"the trait `X` is not implemented for `Y`" explanation in E0277. This
information is already conveyed in the notes explaining requirements,
making it redundant while making the text (particularly in labels)
harder to read.
```
error[E0277]: the trait bound `NotCopy: Copy` is not satisfied
--> $DIR/wf-static-type.rs:10:13
|
LL | static FOO: IsCopy<Option<NotCopy>> = IsCopy { t: None };
| ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `NotCopy`
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= note: required for `Option<NotCopy>` to implement `Copy`
note: required by a bound in `IsCopy`
--> $DIR/wf-static-type.rs:7:17
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LL | struct IsCopy<T:Copy> { t: T }
| ^^^^ required by this bound in `IsCopy`
```
vs the prior
```
error[E0277]: the trait bound `NotCopy: Copy` is not satisfied
--> $DIR/wf-static-type.rs:10:13
|
LL | static FOO: IsCopy<Option<NotCopy>> = IsCopy { t: None };
| ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `NotCopy`, which is required by `Option<NotCopy>: Copy`
|
= note: required for `Option<NotCopy>` to implement `Copy`
note: required by a bound in `IsCopy`
--> $DIR/wf-static-type.rs:7:17
|
LL | struct IsCopy<T:Copy> { t: T }
| ^^^^ required by this bound in `IsCopy`
```
412 lines
16 KiB
Plaintext
412 lines
16 KiB
Plaintext
error[E0277]: the size for values of type `W` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:23:8
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LL | enum E<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized> {
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| - this type parameter needs to be `Sized`
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LL | // parameter
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LL | VA(W),
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| ^ doesn't have a size known at compile-time
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - enum E<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized> {
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LL + enum E<W, X: ?Sized, Y: ?Sized, Z: ?Sized> {
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help: borrowed types always have a statically known size
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LL | VA(&W),
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VA(Box<W>),
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| ++++ +
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error[E0277]: the size for values of type `X` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:25:11
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LL | enum E<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized> {
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| - this type parameter needs to be `Sized`
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...
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LL | VB{x: X},
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| ^ doesn't have a size known at compile-time
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - enum E<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized> {
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LL + enum E<W: ?Sized, X, Y: ?Sized, Z: ?Sized> {
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help: borrowed types always have a statically known size
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LL | VB{x: &X},
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| +
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VB{x: Box<X>},
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| ++++ +
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error[E0277]: the size for values of type `Y` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:27:15
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LL | enum E<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized> {
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| - this type parameter needs to be `Sized`
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...
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LL | VC(isize, Y),
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| ^ doesn't have a size known at compile-time
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - enum E<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized> {
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LL + enum E<W: ?Sized, X: ?Sized, Y, Z: ?Sized> {
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help: borrowed types always have a statically known size
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LL | VC(isize, &Y),
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VC(isize, Box<Y>),
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| ++++ +
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error[E0277]: the size for values of type `Z` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:29:21
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LL | enum E<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized> {
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| - this type parameter needs to be `Sized`
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...
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LL | VD{u: isize, x: Z},
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| ^ doesn't have a size known at compile-time
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - enum E<W: ?Sized, X: ?Sized, Y: ?Sized, Z: ?Sized> {
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LL + enum E<W: ?Sized, X: ?Sized, Y: ?Sized, Z> {
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help: borrowed types always have a statically known size
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LL | VD{u: isize, x: &Z},
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VD{u: isize, x: Box<Z>},
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error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:33:8
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LL | VE([u8]),
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| ^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `[u8]`
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VE(&[u8]),
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VE(Box<[u8]>),
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| ++++ +
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error[E0277]: the size for values of type `str` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:35:11
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LL | VF{x: str},
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| ^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `str`
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VF{x: &str},
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VF{x: Box<str>},
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error[E0277]: the size for values of type `[f32]` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:37:15
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LL | VG(isize, [f32]),
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| ^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `[f32]`
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VG(isize, &[f32]),
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VG(isize, Box<[f32]>),
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error[E0277]: the size for values of type `[u32]` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:39:21
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LL | VH{u: isize, x: [u32]},
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| ^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `[u32]`
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VH{u: isize, x: &[u32]},
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VH{u: isize, x: Box<[u32]>},
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error[E0277]: the size for values of type `(dyn Foo + 'static)` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:53:8
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LL | VM(dyn Foo),
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| ^^^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `(dyn Foo + 'static)`
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VM(&dyn Foo),
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VM(Box<dyn Foo>),
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error[E0277]: the size for values of type `(dyn Bar + 'static)` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:55:11
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LL | VN{x: dyn Bar},
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| ^^^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `(dyn Bar + 'static)`
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VN{x: &dyn Bar},
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VN{x: Box<dyn Bar>},
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error[E0277]: the size for values of type `(dyn FooBar + 'static)` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:57:15
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LL | VO(isize, dyn FooBar),
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| ^^^^^^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `(dyn FooBar + 'static)`
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VO(isize, &dyn FooBar),
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VO(isize, Box<dyn FooBar>),
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error[E0277]: the size for values of type `(dyn BarFoo + 'static)` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:59:21
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LL | VP{u: isize, x: dyn BarFoo},
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| ^^^^^^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `(dyn BarFoo + 'static)`
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VP{u: isize, x: &dyn BarFoo},
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VP{u: isize, x: Box<dyn BarFoo>},
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error[E0277]: the size for values of type `[i8]` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:63:8
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LL | VQ(<&'static [i8] as Deref>::Target),
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `[i8]`
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VQ(&<&'static [i8] as Deref>::Target),
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VQ(Box<<&'static [i8] as Deref>::Target>),
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error[E0277]: the size for values of type `[char]` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:65:11
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LL | VR{x: <&'static [char] as Deref>::Target},
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `[char]`
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VR{x: &<&'static [char] as Deref>::Target},
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VR{x: Box<<&'static [char] as Deref>::Target>},
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error[E0277]: the size for values of type `[f64]` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:67:15
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LL | VS(isize, <&'static [f64] as Deref>::Target),
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `[f64]`
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VS(isize, &<&'static [f64] as Deref>::Target),
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VS(isize, Box<<&'static [f64] as Deref>::Target>),
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error[E0277]: the size for values of type `[i32]` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:69:21
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LL | VT{u: isize, x: <&'static [i32] as Deref>::Target},
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `[i32]`
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VT{u: isize, x: &<&'static [i32] as Deref>::Target},
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VT{u: isize, x: Box<<&'static [i32] as Deref>::Target>},
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error[E0277]: the size for values of type `(dyn PathHelper1 + 'static)` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:43:8
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LL | VI(Path1),
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| ^^^^^ doesn't have a size known at compile-time
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= help: within `Path1`, the trait `Sized` is not implemented for `(dyn PathHelper1 + 'static)`
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note: required because it appears within the type `Path1`
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--> $DIR/unsized-enum2.rs:16:8
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LL | struct Path1(dyn PathHelper1);
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| ^^^^^
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VI(&Path1),
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VI(Box<Path1>),
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error[E0277]: the size for values of type `(dyn PathHelper2 + 'static)` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:45:11
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LL | VJ{x: Path2},
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| ^^^^^ doesn't have a size known at compile-time
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= help: within `Path2`, the trait `Sized` is not implemented for `(dyn PathHelper2 + 'static)`
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note: required because it appears within the type `Path2`
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--> $DIR/unsized-enum2.rs:17:8
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LL | struct Path2(dyn PathHelper2);
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| ^^^^^
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VJ{x: &Path2},
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VJ{x: Box<Path2>},
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error[E0277]: the size for values of type `(dyn PathHelper3 + 'static)` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:47:15
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LL | VK(isize, Path3),
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| ^^^^^ doesn't have a size known at compile-time
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= help: within `Path3`, the trait `Sized` is not implemented for `(dyn PathHelper3 + 'static)`
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note: required because it appears within the type `Path3`
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--> $DIR/unsized-enum2.rs:18:8
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LL | struct Path3(dyn PathHelper3);
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| ^^^^^
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VK(isize, &Path3),
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VK(isize, Box<Path3>),
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error[E0277]: the size for values of type `(dyn PathHelper4 + 'static)` cannot be known at compilation time
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--> $DIR/unsized-enum2.rs:49:21
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LL | VL{u: isize, x: Path4},
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| ^^^^^ doesn't have a size known at compile-time
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= help: within `Path4`, the trait `Sized` is not implemented for `(dyn PathHelper4 + 'static)`
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note: required because it appears within the type `Path4`
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--> $DIR/unsized-enum2.rs:19:8
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LL | struct Path4(dyn PathHelper4);
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| ^^^^^
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= note: no field of an enum variant may have a dynamically sized type
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= help: change the field's type to have a statically known size
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help: borrowed types always have a statically known size
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LL | VL{u: isize, x: &Path4},
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help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | VL{u: isize, x: Box<Path4>},
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error: aborting due to 20 previous errors
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For more information about this error, try `rustc --explain E0277`.
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