src/test/ui/traits/bad-sized.stderr

   1 error[E0225]: only auto traits can be used as additional traits in a trait object
   2   --> $DIR/bad-sized.rs:4:28
   3    |
   4 LL |     let x: Vec<dyn Trait + Sized> = Vec::new();
   5    |                    -----   ^^^^^ additional non-auto trait
   6    |                    |
   7    |                    first non-auto trait
   8    |
   9    = help: consider creating a new trait with all of these as super-traits and using that trait here instead: `trait NewTrait: Trait + Sized {}`
  10    = 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>
  11
  12 error[E0277]: the size for values of type `dyn Trait` cannot be known at compilation time
  13   --> $DIR/bad-sized.rs:4:12
  14    |
  15 LL |     let x: Vec<dyn Trait + Sized> = Vec::new();
  16    |            ^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
  17    |
  18    = help: the trait `Sized` is not implemented for `dyn Trait`
  19 note: required by a bound in `Vec`
  20   --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
  21    |
  22 LL | pub struct Vec<T, #[unstable(feature = "allocator_api", issue = "32838")] A: Allocator = Global> {
  23    |                ^ required by this bound in `Vec`
  24
  25 error[E0277]: the size for values of type `dyn Trait` cannot be known at compilation time
  26   --> $DIR/bad-sized.rs:4:37
  27    |
  28 LL |     let x: Vec<dyn Trait + Sized> = Vec::new();
  29    |                                     ^^^^^^^^ doesn't have a size known at compile-time
  30    |
  31    = help: the trait `Sized` is not implemented for `dyn Trait`
  32 note: required by `Vec::<T>::new`
  33   --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
  34    |
  35 LL |     pub const fn new() -> Self {
  36    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
  37
  38 error[E0277]: the size for values of type `dyn Trait` cannot be known at compilation time
  39   --> $DIR/bad-sized.rs:4:37
  40    |
  41 LL |     let x: Vec<dyn Trait + Sized> = Vec::new();
  42    |                                     ^^^ doesn't have a size known at compile-time
  43    |
  44    = help: the trait `Sized` is not implemented for `dyn Trait`
  45 note: required by a bound in `Vec`
  46   --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
  47    |
  48 LL | pub struct Vec<T, #[unstable(feature = "allocator_api", issue = "32838")] A: Allocator = Global> {
  49    |                ^ required by this bound in `Vec`
  50
  51 error: aborting due to 4 previous errors
  52
  53 Some errors have detailed explanations: E0225, E0277.
  54 For more information about an error, try `rustc --explain E0225`.