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

   1 error[E0277]: the trait bound `U: std::marker::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 `std::marker::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: std::marker::Copy
  13    |                                    ^^^^^^^^^^^^^^^^^^^^^^
  14
  15 error[E0277]: the size for values of type `(dyn std::marker::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 `std::marker::Sized` is not implemented for `(dyn std::marker::Copy + 'static)`
  25    = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
  26 help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
  27   --> $DIR/wf-fn-where-clause.rs:16:12
  28    |
  29 LL | struct Vec<T> {
  30    |            ^ this could be changed to `T: ?Sized`...
  31 LL |     t: T,
  32    |        - ...if indirection was used here: `Box<T>`
  33
  34 error[E0038]: the trait `std::marker::Copy` cannot be made into an object
  35   --> $DIR/wf-fn-where-clause.rs:12:16
  36    |
  37 LL | fn bar() where Vec<dyn Copy>:, {}
  38    |                ^^^^^^^^^^^^^ the trait `std::marker::Copy` cannot be made into an object
  39    |
  40    = note: the trait cannot be made into an object because it requires `Self: Sized`
  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`.