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879f62bb3c
* The phrasing "only does something for" made sense back when this diagnostic was a (hard) warning. Now however, it's simply a hard error and thus completely rules out "doing something". * The primary message was way too long * The new wording more closely mirrors the wording we use for applying other bound modifiers (like `const` and `async`) to incompatible traits. * "all other traits are not bound by default" is no longer accurate under Sized Hierarchy. E.g., traits and assoc tys are (currently) bounded by `MetaSized` by default but can't be relaxed using `?MetaSized` (instead, you relax it by adding `PointeeSized`). * I've decided against adding any diagnositic notes or suggestions for now like "trait `Trait` can't be relaxed as it's not bound by default" which would be incorrect for `MetaSized` and assoc tys as mentioned above) or "consider changing `?MetaSized` to `PointeeSized`" as the Sized Hierarchy impl is still WIP)
89 lines
2.9 KiB
Plaintext
89 lines
2.9 KiB
Plaintext
error: bound modifier `?` can only be applied to `Sized`
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--> $DIR/default-bound.rs:16:21
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LL | fn neg_metasized<T: ?MetaSized>() {}
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| ^^^^^^^^^^
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error: bound modifier `?` can only be applied to `Sized`
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--> $DIR/default-bound.rs:22:24
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LL | fn neg_pointeesized<T: ?PointeeSized>() { }
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| ^^^^^^^^^^^^^
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error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
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--> $DIR/default-bound.rs:29:12
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LL | bare::<[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: required by an implicit `Sized` bound in `bare`
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--> $DIR/default-bound.rs:6:9
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LL | fn bare<T>() {}
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| ^ required by the implicit `Sized` requirement on this type parameter in `bare`
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help: consider relaxing the implicit `Sized` restriction
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LL | fn bare<T: ?Sized>() {}
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| ++++++++
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error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
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--> $DIR/default-bound.rs:31:13
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LL | sized::<[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: required by a bound in `sized`
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--> $DIR/default-bound.rs:9:13
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LL | fn sized<T: Sized>() {}
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| ^^^^^ required by this bound in `sized`
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error[E0277]: the size for values of type `main::Foo` cannot be known at compilation time
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--> $DIR/default-bound.rs:42:12
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LL | bare::<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 `main::Foo`
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note: required by an implicit `Sized` bound in `bare`
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--> $DIR/default-bound.rs:6:9
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LL | fn bare<T>() {}
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| ^ required by the implicit `Sized` requirement on this type parameter in `bare`
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help: consider relaxing the implicit `Sized` restriction
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LL | fn bare<T: ?Sized>() {}
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| ++++++++
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error[E0277]: the size for values of type `main::Foo` cannot be known at compilation time
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--> $DIR/default-bound.rs:44:13
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LL | sized::<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 `main::Foo`
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note: required by a bound in `sized`
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--> $DIR/default-bound.rs:9:13
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LL | fn sized<T: Sized>() {}
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| ^^^^^ required by this bound in `sized`
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error[E0277]: the size for values of type `main::Foo` cannot be known
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--> $DIR/default-bound.rs:46:17
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LL | metasized::<Foo>();
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| ^^^ doesn't have a known size
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= help: the trait `MetaSized` is not implemented for `main::Foo`
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note: required by a bound in `metasized`
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--> $DIR/default-bound.rs:14:17
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LL | fn metasized<T: MetaSized>() {}
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| ^^^^^^^^^ required by this bound in `metasized`
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error: aborting due to 7 previous errors
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For more information about this error, try `rustc --explain E0277`.
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