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 | fn foo<T,U>() where T: ExtraCopy<U>
   5    |                        ^^^^^^^^^^^^ the trait `Copy` is not implemented for `U`
   6    |
   7 note: required by a bound in `ExtraCopy`
   8   --> $DIR/wf-fn-where-clause.rs:6:19
   9    |
  10 LL | trait ExtraCopy<T:Copy> { }
  11    |                   ^^^^ required by this bound in `ExtraCopy`
  12 help: consider further restricting type parameter `U`
  13    |
  14 LL | fn foo<T,U>() where T: ExtraCopy<U>, U: std::marker::Copy
  15    |                                    ++++++++++++++++++++++
  16
  17 error[E0277]: the size for values of type `(dyn Copy + 'static)` cannot be known at compilation time
  18   --> $DIR/wf-fn-where-clause.rs:12:16
  19    |
  20 LL | fn bar() where Vec<dyn Copy>:, {}
  21    |                ^^^^^^^^^^^^^ doesn't have a size known at compile-time
  22    |
  23    = help: the trait `Sized` is not implemented for `(dyn Copy + 'static)`
  24 note: required by a bound in `Vec`
  25   --> $DIR/wf-fn-where-clause.rs:16:12
  26    |
  27 LL | struct Vec<T> {
  28    |            ^ required by this bound in `Vec`
  29 help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
  30   --> $DIR/wf-fn-where-clause.rs:16:12
  31    |
  32 LL | struct Vec<T> {
  33    |            ^ this could be changed to `T: ?Sized`...
  34 LL |     t: T,
  35    |        - ...if indirection were used here: `Box<T>`
  36
  37 error[E0038]: the trait `Copy` cannot be made into an object
  38   --> $DIR/wf-fn-where-clause.rs:12:16
  39    |
  40 LL | fn bar() where Vec<dyn Copy>:, {}
  41    |                ^^^^^^^^^^^^^ `Copy` cannot be made into an object
  42    |
  43    = note: the trait cannot be made into an object because it requires `Self: Sized`
  44    = 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>
  45
  46 error: aborting due to 3 previous errors
  47
  48 Some errors have detailed explanations: E0038, E0277.
  49 For more information about an error, try `rustc --explain E0038`.