mirror of
https://github.com/rust-lang/rust
synced 2024-09-30 22:04:36 +00:00
c4c22b0d52
```
error[E0277]: the size for values of type `[i32]` cannot be known at compilation time
--> f100.rs:2:33
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2 | let _ = std::mem::size_of::<[i32]>();
| ^^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `[i32]`
note: required by an implicit `Sized` bound in `std::mem::size_of`
--> /home/gh-estebank/rust/library/core/src/mem/mod.rs:312:22
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312 | pub const fn size_of<T>() -> usize {
| ^ required by the implicit `Sized` requirement on this bound in `size_of`
```
Fix #120178.
46 lines
2.1 KiB
Plaintext
46 lines
2.1 KiB
Plaintext
error[E0225]: only auto traits can be used as additional traits in a trait object
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--> $DIR/bad-sized.rs:4:28
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LL | let x: Vec<dyn Trait + Sized> = Vec::new();
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| ----- ^^^^^ additional non-auto trait
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| first non-auto trait
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= help: consider creating a new trait with all of these as supertraits and using that trait here instead: `trait NewTrait: Trait + Sized {}`
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= note: auto-traits like `Send` and `Sync` are traits that have special properties; for more information on them, visit <https://doc.rust-lang.org/reference/special-types-and-traits.html#auto-traits>
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error[E0277]: the size for values of type `dyn Trait` cannot be known at compilation time
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--> $DIR/bad-sized.rs:4:12
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LL | let x: Vec<dyn Trait + Sized> = Vec::new();
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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 Trait`
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note: required by an implicit `Sized` bound in `Vec`
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--> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
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error[E0277]: the size for values of type `dyn Trait` cannot be known at compilation time
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--> $DIR/bad-sized.rs:4:37
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LL | let x: Vec<dyn Trait + Sized> = Vec::new();
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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 Trait`
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note: required by a bound in `Vec::<T>::new`
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--> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
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error[E0277]: the size for values of type `dyn Trait` cannot be known at compilation time
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--> $DIR/bad-sized.rs:4:37
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LL | let x: Vec<dyn Trait + Sized> = Vec::new();
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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 Trait`
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note: required by an implicit `Sized` bound in `Vec`
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--> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
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error: aborting due to 4 previous errors
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Some errors have detailed explanations: E0225, E0277.
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For more information about an error, try `rustc --explain E0225`.
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