error[E0277]: `[i32; 4]` needs to be a pointer-sized type --> $DIR/check-size-at-cast.rs:7:13 | LL | let i = [1, 2, 3, 4] as dyn* Debug; | ^^^^^^^^^^^^ `[i32; 4]` needs to be a pointer-sized type | = help: the trait `PointerSized` is not implemented for `[i32; 4]` error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.