src/test/ui/wf/wf-fn-where-clause.stderr

   1 error[E0277]: the trait bound `U: Copy` is not satisfied
   2   --> $DIR/wf-fn-where-clause.rs:8:24
   3    |
   4 LL | trait ExtraCopy<T:Copy> { }
   5    |                   ---- required by this bound in `ExtraCopy`
   6 LL |
   7 LL | fn foo<T,U>() where T: ExtraCopy<U>
   8    |                        ^^^^^^^^^^^^ the trait `Copy` is not implemented for `U`
   9    |
  10 help: consider further restricting type parameter `U`
  11    |
  12 LL | fn foo<T,U>() where T: ExtraCopy<U>, U: Copy
  13    |                                    ^^^^^^^^^
  14
  15 error[E0277]: the size for values of type `(dyn Copy + 'static)` cannot be known at compilation time
  16   --> $DIR/wf-fn-where-clause.rs:12:16
  17    |
  18 LL | fn bar() where Vec<dyn Copy>:, {}
  19    |                ^^^^^^^^^^^^^ doesn't have a size known at compile-time
  20 ...
  21 LL | struct Vec<T> {
  22    |            - required by this bound in `Vec`
  23    |
  24    = help: the trait `Sized` is not implemented for `(dyn Copy + 'static)`
  25 help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
  26   --> $DIR/wf-fn-where-clause.rs:16:12
  27    |
  28 LL | struct Vec<T> {
  29    |            ^ this could be changed to `T: ?Sized`...
  30 LL |     t: T,
  31    |        - ...if indirection were used here: `Box<T>`
  32
  33 error[E0038]: the trait `Copy` cannot be made into an object
  34   --> $DIR/wf-fn-where-clause.rs:12:16
  35    |
  36 LL | fn bar() where Vec<dyn Copy>:, {}
  37    |                ^^^^^^^^^^^^^ `Copy` cannot be made into an object
  38    |
  39    = note: the trait cannot be made into an object because it requires `Self: Sized`
  40    = note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
  41
  42 error: aborting due to 3 previous errors
  43
  44 Some errors have detailed explanations: E0038, E0277.
  45 For more information about an error, try `rustc --explain E0038`.