error[E0277]: the trait bound `Box<{integer}>: Foo` is not satisfied --> $DIR/kindck-inherited-copy-bound.rs:21:16 | LL | take_param(&x); | ---------- ^^ the trait `Copy` is not implemented for `Box<{integer}>`, which is required by `Box<{integer}>: Foo` | | | required by a bound introduced by this call | note: required for `Box<{integer}>` to implement `Foo` --> $DIR/kindck-inherited-copy-bound.rs:14:14 | LL | impl<T:Copy> Foo for T { | ---- ^^^ ^ | | | unsatisfied trait bound introduced here note: required by a bound in `take_param` --> $DIR/kindck-inherited-copy-bound.rs:17:17 | LL | fn take_param<T:Foo>(foo: &T) { } | ^^^ required by this bound in `take_param` error[E0038]: the trait `Foo` cannot be made into an object --> $DIR/kindck-inherited-copy-bound.rs:28:13 | LL | let z = &x as &dyn Foo; | ^^ `Foo` cannot be made into an object | 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> --> $DIR/kindck-inherited-copy-bound.rs:10:13 | LL | trait Foo : Copy { | --- ^^^^ ...because it requires `Self: Sized` | | | this trait cannot be made into an object... = note: required for the cast from `&Box<i32>` to `&dyn Foo` error: aborting due to 2 previous errors Some errors have detailed explanations: E0038, E0277. For more information about an error, try `rustc --explain E0038`.