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Allow dropping dyn principal

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Michael Goulet 2023-08-09 00:31:26 +00:00 • committed by Maybe Lapkin
parent 3a85d3fa78
commit e3800a1a04
10 changed files with 83 additions and 35 deletions
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14
tests/ui/impl-trait/unsized_coercion5.next.stderr
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@ -1,14 +0,0 @@
error[E0308]: mismatched types
--> $DIR/unsized_coercion5.rs:16:32
|
LL | let y: Box<dyn Send> = x as Box<dyn Trait + Send>;
| ------------- ^^^^^^^^^^^^^^^^^^^^^^^^^^ expected trait `Send`, found trait `Trait + Send`
| |
| expected due to this
|
= note: expected struct `Box<dyn Send>`
found struct `Box<dyn Trait + Send>`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0308`.

18
tests/ui/impl-trait/unsized_coercion5.old.stderr
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@ -1,16 +1,5 @@
error[E0308]: mismatched types
--> $DIR/unsized_coercion5.rs:16:32
|
LL | let y: Box<dyn Send> = x as Box<dyn Trait + Send>;
| ------------- ^^^^^^^^^^^^^^^^^^^^^^^^^^ expected trait `Send`, found trait `Trait + Send`
| |
| expected due to this
|
= note: expected struct `Box<dyn Send>`
found struct `Box<dyn Trait + Send>`
error[E0277]: the size for values of type `impl Trait + ?Sized` cannot be known at compilation time
--> $DIR/unsized_coercion5.rs:16:32
--> $DIR/unsized_coercion5.rs:17:32
|
LL | let y: Box<dyn Send> = x as Box<dyn Trait + Send>;
| ^ doesn't have a size known at compile-time
@ -18,7 +7,6 @@ LL | let y: Box<dyn Send> = x as Box<dyn Trait + Send>;
= help: the trait `Sized` is not implemented for `impl Trait + ?Sized`
= note: required for the cast from `Box<impl Trait + ?Sized>` to `Box<dyn Trait + Send>`
error: aborting due to 2 previous errors
error: aborting due to 1 previous error
Some errors have detailed explanations: E0277, E0308.
For more information about an error, try `rustc --explain E0277`.
For more information about this error, try `rustc --explain E0277`.

2
tests/ui/impl-trait/unsized_coercion5.rs
View file

@ -3,6 +3,7 @@
//@ revisions: next old
//@[next] compile-flags: -Znext-solver
//@[next] check-pass
#![feature(trait_upcasting)]
@ -15,7 +16,6 @@ fn hello() -> Box<impl Trait + ?Sized> {
let x = hello();
let y: Box<dyn Send> = x as Box<dyn Trait + Send>;
//[old]~^ ERROR: the size for values of type `impl Trait + ?Sized` cannot be know
//~^^ ERROR: mismatched types
}
Box::new(1u32)
}