error[E0038]: the trait `Array` cannot be made into an object --> $DIR/issue-20692.rs:7:5 | LL | &dyn Array; | ^^^^^^^^^^ `Array` 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 --> $DIR/issue-20692.rs:1:14 | LL | trait Array: Sized + Copy {} | ----- ^^^^^ ^^^^ ...because it requires `Self: Sized` | | | | | ...because it requires `Self: Sized` | this trait cannot be made into an object... error[E0038]: the trait `Array` cannot be made into an object --> $DIR/issue-20692.rs:4:13 | LL | let _ = x | ^ `Array` 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 --> $DIR/issue-20692.rs:1:14 | LL | trait Array: Sized + Copy {} | ----- ^^^^^ ^^^^ ...because it requires `Self: Sized` | | | | | ...because it requires `Self: Sized` | this trait cannot be made into an object... = note: required for the cast from `&T` to `&dyn Array` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0038`.